You don't need your own port, I run mine on 4711 and it works fine - the key thing is that the other end knows where you are, i.e. address and port..
The port is passed as the command line parameter to the bridge program, e.g.:
./bridge 4711
runs it on the standard port.
Sampsa
On 1 Jul 2010, at 21:10, H Vlems wrote:
OK, I understand that part (I think) of the bridge program.
I wasn't aware that I'd need my own port number. I'll opt for 4744, if that
is alright.
Do I need to configure this somewhere (like in the .conf file)?
Hans
PS
My apologies for all these questions but I haven't seen a manual about the
bridge program....
-----Oorspronkelijk bericht-----
Van: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] Namens
Johnny Billquist
Verzonden: donderdag, juli 2010 15:45
Aan: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] Attaching to hecnet
Hi.
H Vlems wrote:
OK, let's try the bridge option first. Could you give me a sample .conf
file
that I can use?
Hmm. Not one that you can use straight away, no.
However, it should look something like this:
================
[bridge]
local <your ethernet interface name>
update psilo.update.uu.se:4711
[decnet]
local
update
=================
And that's it. What your local ethernet name is, I have no idea.
My external IP address is:
Name: osmium.homeip.net
Address: 87.209.50.192
That is something I need for my side of the bridge. In addition, I also
need to know what port number you will be using.
I assume that a NAT entry is needed on my ADSL router, right? Would that
be
for port 4711 (as in eau de cologne ??)
Yes, 4711 is named after the water from Cologne. :-)
(Very oldish hacker folklore that I suspect people nowadays might not
know...)
And yes, if you have NAT running, you will need to forward traffic
between your box, at whatever port you are using, and
psilo.update.uu.se:4711. And this is UDP traffic.
Johnny
Hans
-----Oorspronkelijk bericht-----
Van: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] Namens
Johnny Billquist
Verzonden: woensdag, juni 2010 14:16
Aan: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] Attaching to hecnet
Hi, Hans.
H Vlems wrote:
OK Johnny, talk to me :-)
This is my plan: I intend to modify two systems to try the connection to
HECnet.
1) I have a linux system under Fedora 9 that will run the bridge software
and an Alpha Server 1200 under VMS V8.3 and DECnet phase IV, address
1.1010.
That should work without any strange problems. You'll probably want to
connect the bridge to me in that case. Let me know when you are ready to
try.
2) a VAXstation 4000 model 90A, running VMS V7.3 and DECnet phase V, in
area
44.
I'd like to try that connection without the linux system.
You need to find someone who can act as the other end in this case.
Which I suspect meaning someone running phase V and as an area router. I
don't know who might be doing this. Maybe someone who do can speak up.
Anyone know if this would be compatible with DECnet over IP as Multinet
does it?
Option 2 is my preferred situation since it removes a by and large
unknown
factor from the equation (the linux box).
Sure. We just need to identify someone you can connect to.
So, what do I need to know and to do to make this work?
Someone to connect to...
Johnny
Hans
-----Oorspronkelijk bericht-----
Van: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] Namens
Johnny Billquist
Verzonden: maandag, juni 2010 21:03
Aan: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] Attaching to hecnet
H Vlems wrote:
What I meant with the phase III-IV-V answer is that direct connectivity
between a phase V and phase III system won't work. But poor man's
routing
will work with a phase IV node in between. Functionality of course is
limited by the phase III host :-)
I wonder if phase III to phase V neccesarily will not work. However, DEC
never guaranteed that it will work, nor did they ever try it.
But you're absolutely right that very few people will have a phase III
system, RT-11 being the most likely candidate?
Probably. Or if someone is running some old versions of other systems.
I've seen the bridge program, but am not sure how to make the .conf file
work. Is it possible to use DECnet address 1.1010 to try and make this
work?
Yes. 1.1010 is not used by anyone, so that node number would be ok to
use to test.
But you also need to talk with me (or someone else) with the bridge
running, to act as the remote end.
Johnny
Hans
-----Oorspronkelijk bericht-----
Van: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] Namens
Johnny Billquist
Verzonden: maandag, juni 2010 11:02
Aan: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] Attaching to hecnet
Hi.
H Vlems wrote:
DECnet phase IV nodes are backwards compatible with phase III.
Yes. But the question here was if phase V will interoperate with phase
III. I don't know the answer to that one, but on the other hand, I don't
think anyone around is running phase III anyway.
There are no restrictions in functionality between phase IV nodes and
phase
V as seen by the unpriviledged user. Area routing may be an issue on
Alpha,
and of course ncl is more of a pain to remember than ncp ;-)
True, as far as that goes.
However, I am not sure that a phase V node can operate as a phase IV
area router.
Someone else pointed out that although DEC claimed that alphas could not
be area routers, that information is incorrect, and you can just tell an
Alpha VMS phase IV node to be an area router, if you want to.
However, DECnet+ is phase V, and all bets are off. :-)
And yes, not only are the NCL commands more difficult to remember
(atleast for me), the node name management is way more difficult as
well. Do anyone know how you copy a nodename database from another
machine with DECnet+?
Two questions:
1-May I use area 44?
Sure.
2-Is there a short guide to set up DECnet over IP to connect to HECnet?
Not that I know of. Maybe Mark Wickens have something on hecnet.eu?
My page (http://www.update.uu.se/~bqt/hecnet.html) only have information
about the bridge.
Johnny
Hans
-----Oorspronkelijk bericht-----
Van: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE]
Namens
Marc Chametzky
Verzonden: maandag, juni 2010 0:04
Aan: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] Attaching to hecnet
DECnet-Plus isn't
able to connect, or at least reliably connect to all OS's that can
potentially be on HECnet. I forget what all OS's I was having issues
with, I know one was RSTS/E v10.1, but I want to say it also included
VAX/VMS. Once I *upgraded* my Alpha running OpenVMS to DECnet Phase
IV,
all these issues went away. These were things as simple as SET HOST.
It's probably that DECnet-Plus (Phase V) cannot speak with DECnet Phase
III (such as on RSTS/E and TOPS-10/20). That's my guess anyway.
Phase V should be able to communicate with VAX/VMS since that's Phase
IV, which is the gold standard of DECnet, IMHO.
--Marc
Geen virus gevonden in het binnenkomende-bericht.
Gecontroleerd door AVG - www.avg.com
Versie: 9.0.830 / Virusdatabase: 271.1.1/2966 - datum van uitgifte:
06/27/10
08:35:00
Geen virus gevonden in het binnenkomende-bericht.
Gecontroleerd door AVG - www.avg.com
Versie: 9.0.830 / Virusdatabase: 271.1.1/2968 - datum van uitgifte:
06/28/10
08:37:00
Geen virus gevonden in het binnenkomende-bericht.
Gecontroleerd door AVG - www.avg.com
Versie: 9.0.830 / Virusdatabase: 271.1.1/2969 - datum van uitgifte:
06/28/10
20:35:00
Geen virus gevonden in het binnenkomende-bericht.
Gecontroleerd door AVG - www.avg.com
Versie: 9.0.830 / Virusdatabase: 271.1.1/2969 - datum van uitgifte:
06/28/10
20:35:00
Geen virus gevonden in het binnenkomende-bericht.
Gecontroleerd door AVG - www.avg.com
Versie: 9.0.830 / Virusdatabase: 271.1.1/2975 - datum van uitgifte: 07/01/10
08:35:00
OK, I understand that part (I think) of the bridge program.
I wasn't aware that I'd need my own port number. I'll opt for 4744, if that
is alright.
Do I need to configure this somewhere (like in the .conf file)?
Hans
PS
My apologies for all these questions but I haven't seen a manual about the
bridge program....
-----Oorspronkelijk bericht-----
Van: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] Namens
Johnny Billquist
Verzonden: donderdag, juli 2010 15:45
Aan: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] Attaching to hecnet
Hi.
H Vlems wrote:
OK, let's try the bridge option first. Could you give me a sample .conf
file
that I can use?
Hmm. Not one that you can use straight away, no.
However, it should look something like this:
================
[bridge]
local <your ethernet interface name>
update psilo.update.uu.se:4711
[decnet]
local
update
=================
And that's it. What your local ethernet name is, I have no idea.
My external IP address is:
Name: osmium.homeip.net
Address: 87.209.50.192
That is something I need for my side of the bridge. In addition, I also
need to know what port number you will be using.
I assume that a NAT entry is needed on my ADSL router, right? Would that
be
for port 4711 (as in eau de cologne ??)
Yes, 4711 is named after the water from Cologne. :-)
(Very oldish hacker folklore that I suspect people nowadays might not
know...)
And yes, if you have NAT running, you will need to forward traffic
between your box, at whatever port you are using, and
psilo.update.uu.se:4711. And this is UDP traffic.
Johnny
Hans
-----Oorspronkelijk bericht-----
Van: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] Namens
Johnny Billquist
Verzonden: woensdag, juni 2010 14:16
Aan: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] Attaching to hecnet
Hi, Hans.
H Vlems wrote:
OK Johnny, talk to me :-)
This is my plan: I intend to modify two systems to try the connection to
HECnet.
1) I have a linux system under Fedora 9 that will run the bridge software
and an Alpha Server 1200 under VMS V8.3 and DECnet phase IV, address
1.1010.
That should work without any strange problems. You'll probably want to
connect the bridge to me in that case. Let me know when you are ready to
try.
2) a VAXstation 4000 model 90A, running VMS V7.3 and DECnet phase V, in
area
44.
I'd like to try that connection without the linux system.
You need to find someone who can act as the other end in this case.
Which I suspect meaning someone running phase V and as an area router. I
don't know who might be doing this. Maybe someone who do can speak up.
Anyone know if this would be compatible with DECnet over IP as Multinet
does it?
Option 2 is my preferred situation since it removes a by and large
unknown
factor from the equation (the linux box).
Sure. We just need to identify someone you can connect to.
So, what do I need to know and to do to make this work?
Someone to connect to...
Johnny
Hans
-----Oorspronkelijk bericht-----
Van: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] Namens
Johnny Billquist
Verzonden: maandag, juni 2010 21:03
Aan: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] Attaching to hecnet
H Vlems wrote:
What I meant with the phase III-IV-V answer is that direct connectivity
between a phase V and phase III system won't work. But poor man's
routing
will work with a phase IV node in between. Functionality of course is
limited by the phase III host :-)
I wonder if phase III to phase V neccesarily will not work. However, DEC
never guaranteed that it will work, nor did they ever try it.
But you're absolutely right that very few people will have a phase III
system, RT-11 being the most likely candidate?
Probably. Or if someone is running some old versions of other systems.
I've seen the bridge program, but am not sure how to make the .conf file
work. Is it possible to use DECnet address 1.1010 to try and make this
work?
Yes. 1.1010 is not used by anyone, so that node number would be ok to
use to test.
But you also need to talk with me (or someone else) with the bridge
running, to act as the remote end.
Johnny
Hans
-----Oorspronkelijk bericht-----
Van: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] Namens
Johnny Billquist
Verzonden: maandag, juni 2010 11:02
Aan: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] Attaching to hecnet
Hi.
H Vlems wrote:
DECnet phase IV nodes are backwards compatible with phase III.
Yes. But the question here was if phase V will interoperate with phase
III. I don't know the answer to that one, but on the other hand, I don't
think anyone around is running phase III anyway.
There are no restrictions in functionality between phase IV nodes and
phase
V as seen by the unpriviledged user. Area routing may be an issue on
Alpha,
and of course ncl is more of a pain to remember than ncp ;-)
True, as far as that goes.
However, I am not sure that a phase V node can operate as a phase IV
area router.
Someone else pointed out that although DEC claimed that alphas could not
be area routers, that information is incorrect, and you can just tell an
Alpha VMS phase IV node to be an area router, if you want to.
However, DECnet+ is phase V, and all bets are off. :-)
And yes, not only are the NCL commands more difficult to remember
(atleast for me), the node name management is way more difficult as
well. Do anyone know how you copy a nodename database from another
machine with DECnet+?
Two questions:
1-May I use area 44?
Sure.
2-Is there a short guide to set up DECnet over IP to connect to HECnet?
Not that I know of. Maybe Mark Wickens have something on hecnet.eu?
My page (http://www.update.uu.se/~bqt/hecnet.html) only have information
about the bridge.
Johnny
Hans
-----Oorspronkelijk bericht-----
Van: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE]
Namens
Marc Chametzky
Verzonden: maandag, juni 2010 0:04
Aan: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] Attaching to hecnet
DECnet-Plus isn't
able to connect, or at least reliably connect to all OS's that can
potentially be on HECnet. I forget what all OS's I was having issues
with, I know one was RSTS/E v10.1, but I want to say it also included
VAX/VMS. Once I *upgraded* my Alpha running OpenVMS to DECnet Phase
IV,
all these issues went away. These were things as simple as SET HOST.
It's probably that DECnet-Plus (Phase V) cannot speak with DECnet Phase
III (such as on RSTS/E and TOPS-10/20). That's my guess anyway.
Phase V should be able to communicate with VAX/VMS since that's Phase
IV, which is the gold standard of DECnet, IMHO.
--Marc
Geen virus gevonden in het binnenkomende-bericht.
Gecontroleerd door AVG - www.avg.com
Versie: 9.0.830 / Virusdatabase: 271.1.1/2966 - datum van uitgifte:
06/27/10
08:35:00
Geen virus gevonden in het binnenkomende-bericht.
Gecontroleerd door AVG - www.avg.com
Versie: 9.0.830 / Virusdatabase: 271.1.1/2968 - datum van uitgifte:
06/28/10
08:37:00
Geen virus gevonden in het binnenkomende-bericht.
Gecontroleerd door AVG - www.avg.com
Versie: 9.0.830 / Virusdatabase: 271.1.1/2969 - datum van uitgifte:
06/28/10
20:35:00
Geen virus gevonden in het binnenkomende-bericht.
Gecontroleerd door AVG - www.avg.com
Versie: 9.0.830 / Virusdatabase: 271.1.1/2969 - datum van uitgifte:
06/28/10
20:35:00
Geen virus gevonden in het binnenkomende-bericht.
Gecontroleerd door AVG - www.avg.com
Versie: 9.0.830 / Virusdatabase: 271.1.1/2975 - datum van uitgifte: 07/01/10
08:35:00
Upgraded.
--Saku
On Thu, Jul 1, 2010 at 4:50 PM, Johnny Billquist <bqt at softjar.se> wrote:
Ok. I've placed a newer version up for grabs. You can find it at http://www.update.uu.se/~bqt/hecnet
There are various minor fixes and potential bugs fixed. I've also added some more obscure features, that people might find useful sometimes...
Johnny
If you are considering the bridge AND you are running LAT then you might want
to consider adding LAT to bridge.conf.
-Steve
Hi.
H Vlems wrote:
OK, let's try the bridge option first. Could you give me a sample .conf file
that I can use?
Hmm. Not one that you can use straight away, no.
However, it should look something like this:
================
[bridge]
local <your ethernet interface name>
update psilo.update.uu.se:4711
[decnet]
local
update
=================
And that's it. What your local ethernet name is, I have no idea.
My external IP address is:
Name: osmium.homeip.net
Address: 87.209.50.192
That is something I need for my side of the bridge. In addition, I also
need to know what port number you will be using.
I assume that a NAT entry is needed on my ADSL router, right? Would that be
for port 4711 (as in eau de cologne ??)
Yes, 4711 is named after the water from Cologne. :-)
(Very oldish hacker folklore that I suspect people nowadays might not
know...)
And yes, if you have NAT running, you will need to forward traffic
between your box, at whatever port you are using, and
psilo.update.uu.se:4711. And this is UDP traffic.
Johnny
Hans
-----Oorspronkelijk bericht-----
Van: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] Namens
Johnny Billquist
Verzonden: woensdag, juni 2010 14:16
Aan: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] Attaching to hecnet
Hi, Hans.
H Vlems wrote:
OK Johnny, talk to me :-)
This is my plan: I intend to modify two systems to try the connection to
HECnet.
1) I have a linux system under Fedora 9 that will run the bridge software
and an Alpha Server 1200 under VMS V8.3 and DECnet phase IV, address
1.1010.
That should work without any strange problems. You'll probably want to
connect the bridge to me in that case. Let me know when you are ready to
try.
2) a VAXstation 4000 model 90A, running VMS V7.3 and DECnet phase V, in
area
44.
I'd like to try that connection without the linux system.
You need to find someone who can act as the other end in this case.
Which I suspect meaning someone running phase V and as an area router. I
don't know who might be doing this. Maybe someone who do can speak up.
Anyone know if this would be compatible with DECnet over IP as Multinet
does it?
Option 2 is my preferred situation since it removes a by and large unknown
factor from the equation (the linux box).
Sure. We just need to identify someone you can connect to.
So, what do I need to know and to do to make this work?
Someone to connect to...
Johnny
Hans
-----Oorspronkelijk bericht-----
Van: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] Namens
Johnny Billquist
Verzonden: maandag, juni 2010 21:03
Aan: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] Attaching to hecnet
H Vlems wrote:
What I meant with the phase III-IV-V answer is that direct connectivity
between a phase V and phase III system won't work. But poor man's routing
will work with a phase IV node in between. Functionality of course is
limited by the phase III host :-)
I wonder if phase III to phase V neccesarily will not work. However, DEC
never guaranteed that it will work, nor did they ever try it.
But you're absolutely right that very few people will have a phase III
system, RT-11 being the most likely candidate?
Probably. Or if someone is running some old versions of other systems.
I've seen the bridge program, but am not sure how to make the .conf file
work. Is it possible to use DECnet address 1.1010 to try and make this
work?
Yes. 1.1010 is not used by anyone, so that node number would be ok to
use to test.
But you also need to talk with me (or someone else) with the bridge
running, to act as the remote end.
Johnny
Hans
-----Oorspronkelijk bericht-----
Van: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] Namens
Johnny Billquist
Verzonden: maandag, juni 2010 11:02
Aan: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] Attaching to hecnet
Hi.
H Vlems wrote:
DECnet phase IV nodes are backwards compatible with phase III.
Yes. But the question here was if phase V will interoperate with phase
III. I don't know the answer to that one, but on the other hand, I don't
think anyone around is running phase III anyway.
There are no restrictions in functionality between phase IV nodes and
phase
V as seen by the unpriviledged user. Area routing may be an issue on
Alpha,
and of course ncl is more of a pain to remember than ncp ;-)
True, as far as that goes.
However, I am not sure that a phase V node can operate as a phase IV
area router.
Someone else pointed out that although DEC claimed that alphas could not
be area routers, that information is incorrect, and you can just tell an
Alpha VMS phase IV node to be an area router, if you want to.
However, DECnet+ is phase V, and all bets are off. :-)
And yes, not only are the NCL commands more difficult to remember
(atleast for me), the node name management is way more difficult as
well. Do anyone know how you copy a nodename database from another
machine with DECnet+?
Two questions:
1-May I use area 44?
Sure.
2-Is there a short guide to set up DECnet over IP to connect to HECnet?
Not that I know of. Maybe Mark Wickens have something on hecnet.eu?
My page (http://www.update.uu.se/~bqt/hecnet.html) only have information
about the bridge.
Johnny
Hans
-----Oorspronkelijk bericht-----
Van: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] Namens
Marc Chametzky
Verzonden: maandag, juni 2010 0:04
Aan: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] Attaching to hecnet
DECnet-Plus isn't
able to connect, or at least reliably connect to all OS's that can
potentially be on HECnet. I forget what all OS's I was having issues
with, I know one was RSTS/E v10.1, but I want to say it also included
VAX/VMS. Once I *upgraded* my Alpha running OpenVMS to DECnet Phase IV,
all these issues went away. These were things as simple as SET HOST.
It's probably that DECnet-Plus (Phase V) cannot speak with DECnet Phase
III (such as on RSTS/E and TOPS-10/20). That's my guess anyway.
Phase V should be able to communicate with VAX/VMS since that's Phase
IV, which is the gold standard of DECnet, IMHO.
--Marc
Geen virus gevonden in het binnenkomende-bericht.
Gecontroleerd door AVG - www.avg.com
Versie: 9.0.830 / Virusdatabase: 271.1.1/2966 - datum van uitgifte:
06/27/10
08:35:00
Geen virus gevonden in het binnenkomende-bericht.
Gecontroleerd door AVG - www.avg.com
Versie: 9.0.830 / Virusdatabase: 271.1.1/2968 - datum van uitgifte:
06/28/10
08:37:00
Geen virus gevonden in het binnenkomende-bericht.
Gecontroleerd door AVG - www.avg.com
Versie: 9.0.830 / Virusdatabase: 271.1.1/2969 - datum van uitgifte:
06/28/10
20:35:00
Geen virus gevonden in het binnenkomende-bericht.
Gecontroleerd door AVG - www.avg.com
Versie: 9.0.830 / Virusdatabase: 271.1.1/2969 - datum van uitgifte: 06/28/10
20:35:00
On Thu, Jul 01, 2010 at 11:49:07AM -0400, Bill Pechter wrote:
MSCP was way ahead of everyone.
MSCP is *STILL* way ahead of everyone. :-D
-brian
--
"Coding in C is like sending a 3 year old to do groceries. You gotta
tell them exactly what you want or you'll end up with a cupboard full of
pop tarts and pancake mix." -- IRC User (http://www.bash.org/?841435)
Guess the .sig is getting out there...
Everytime I see a SAN or SATA disk I think of RA81's and HSC50's.
Serial Attached SCSI --- hmm reminds me of the Digital Storage
Architecture days
MSCP was way ahead of everyone.
Bill
--
d|i|g|i|t|a|l had it THEN. Don't you wish you could still buy it now!
pechter-at-gmail.com
On Thu, Jul 1, 2010 at 9:46 AM, Johnny Billquist <bqt at softjar.se> wrote:
As I read somewhere:
"DEC had it then. Don't you wish you could buy it now?"
(In referring to DECs slogan in the 80s: DEC has it now)
I agree. DEC engineering was pretty good. Too bad some other parts of that
company totally lost it.
Johnny
H Vlems wrote:
I agree with you that geographical separation may just as well be handled
with circuit routing (level 1 routing). Which was one of the reasons
DECnet
over DDCMP was such a nice idea, you could set this up with modems only.
The
speed was low of course.
Area routing overhead on a flat LAN was fairly rare I guess. As you've
explained, area routing was more an address space solution rather than a
connectivity solution. Putting all these nodes on a switched network was
something they hadn't seen (at least the persons I talked to in those
days).
We were the second site to use FDDI too (remember the Gigaswitches?) and
I'm
glad to say that everything worked as advertised. DEC engineering was
unsurpassed IMHO.
Hans
-----Oorspronkelijk bericht-----
Van: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] Namens
Johnny Billquist
Verzonden: woensdag, juni 2010 14:45
Aan: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] Attaching to hecnet
H Vlems wrote:
Johnny, the original DECnet manuals showed pictures of area routers that
were interconnected by WAN links. Each site had its own area number. In
fact
the name "area routing" implies clearly that the concept was meant to set
up
DECnet networks that were geographically separated.
Certainly. But that does not imply that just because you have physically
different locations that they must be in different areas. And areas don't
necessarily imply geography... :-)
Level 1 routers does exactly the same job, the same way, but keeps it
within one area.
But basically, the reasons for the different "levels" are originally
technical. You have segments, which more or less means directly connected
machines.
Then you have an area, which connects these segments. Traffic within a
segment can be fairly high. Between segments there is much less traffic,
since only traffic actually meant for a destination at the other end is
going through, and then of course the routing messages of the level 1
routers.
Level 1 routers knows where all machines in the same area are located, and
knows the most efficient way to any node within the same area. However, it
only keeps track of the closest area router, and knows nothing about any
other area.
Area routers work just like level 1 routers, but they also have an area
routing table, so they know the most efficient path to an area router for
any area.
So, an end node only knows what machines are on the same segment, and
which is the closest level 1 router. Level 1 routers knows where all
machines are in the same area, and knows where the closest area router is.
Area routers knows where every machine is on the local area, and also
where all area routers are.
Now, this means that a machine that sits in one area will not neccesarily
take the shortest path to a machine in another area. In fact, it will not
neccesarily take the shortest path even to another machine in the same area.
But that's another story. :-)
For most points and purposes, a level 1 router and an area router will
give you exactly the same effect.
So, just because you have machines that are physically remote is by no
mean a reason for them to be in separate areas. A level 1 router will solve
that just as well.
What areas bring to the table is essentially just that you expand the
address space, and add another level of hierarchy to the network. It is
(obviously) up to you how you want to interpret that extra level. I'm not
saying that you cannot use it to match network hierarchy to geography, just
that there is no technical reason to align things that way.
I ran a fairly large DECnet environment 20 years ago with >20 PDP-11's,
80
VAX systems >600 pc's and several alpha's, plus a few unix systems that
ran
DECnet too (in those days DECnet was the multiplatform protocol of
choice).
I seprataed each factory in its own DECnet area. DEC Holland got midly
interested in the design because they wondered whether the level 2
routing
overhead wouldn't hurt network performance. Which it didn't :-)
Can't see why it should. If you have a fairly busy network, the overhead
of the level 2 routing packets is very low. And if the network is mostly
idle, you have the capacity to spare anyway.
I'm surprised if DEC Holland was that curious, or didn't know better,
since DEC's internal network was way larger at that time.
They had already passed 60.000 nodes on Easynet (which was the name of the
internal network). I worked at DEC for a while in the 80s, and Easynet
worked just fine, and was very nice.
If I remember right, areas were sortof allocated by country, although some
places (like the US) used several, while some places shared one between
several countries.
One reason for separating systems in different areas was that rebooting
the
pc's would generate so many DECnet state up and down messages that
PDP-11's
and the older VAX systems choked in their console output.
Yeah, that can be an annoyance. But that's what the logging filters are
there for.
Johnny
Hans
-----Oorspronkelijk bericht-----
Van: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] Namens
Johnny Billquist
Verzonden: maandag, juni 2010 21:11
Aan: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] Attaching to hecnet
Brian Hechinger wrote:
Ok, so I should be getting to my plans soon enough here and had some
questions
about how I should set this up.
I'm going to install SIMH on the machine in colo (100mbit connection
here
in
the US, so might be useful as a "hub") as well as a small handful of
boxes
here at home.
Sounds good.
Should I just use one area? What's the best way to set that up?
Areas in DECnet are not really meant to be associated with physical
location, but rather with organizational. So keep it within one area.
For physically different locations, you might want to use level 1
routers, though. But as the internet nowadays is so fast, using just a
bridge, and pretend that it's all one ethernet segment also works just
fine.
Johnny
Geen virus gevonden in het binnenkomende-bericht.
Gecontroleerd door AVG - www.avg.com Versie: 9.0.830 / Virusdatabase:
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06/28/10
20:35:00
Geen virus gevonden in het binnenkomende-bericht.
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20:35:00
On Thu, Jul 01, 2010 at 04:01:11PM +0200, Johnny Billquist wrote:
Ah well, the irony of it all... But it's a good legacy of the
engineering that 30 year old machines are still being used in production
around the world.
That coupled with the fact that DEC did things 20-30 years ago that other
companies STILL don't do well.
Clustering comes to mind as one, but more specifically things like DSSI that
were very smart when it came to supporting clustering.
Also, being able to "log onto the CLI of your hard drive" ranks up there as
just plain cool. :-D
-brian
--
"Coding in C is like sending a 3 year old to do groceries. You gotta
tell them exactly what you want or you'll end up with a cupboard full of
pop tarts and pancake mix." -- IRC User (http://www.bash.org/?841435)
Paul Koning wrote:
Indeed. Ken Olsen never understood marketing, and he understood
sales
even less.
..
It didn't really improve when KO left the building either...
True, because KO was replaced by a weasel whose only goal was to chop
the company into pieces and sell the remnants to unsuspecting buyers for
big money.
Glad we totally agree on Palmer's merits... :-)
KO at least cared for the company, even if he totally messed some things up.
Palmer was more interested in maximizing his own bonus.
Ah well, the irony of it all... But it's a good legacy of the engineering that 30 year old machines are still being used in production around the world.
Johnny
Indeed. Ken Olsen never understood marketing, and he understood
sales
even less.
..
It didn't really improve when KO left the building either...
True, because KO was replaced by a weasel whose only goal was to chop
the company into pieces and sell the remnants to unsuspecting buyers for
big money.
paul
Paul Koning wrote:
As I read somewhere:
"DEC had it then. Don't you wish you could buy it now?"
(In referring to DECs slogan in the 80s: DEC has it now)
I agree. DEC engineering was pretty good. Too bad some other parts of
that company totally lost it.
Indeed. Ken Olsen never understood marketing, and he understood sales
even less.
When working at a (successful) startup, I often told my colleagues in
sales and marketing how enjoyable it was to work with excellent sales
and marketing people, because as a former DEC employee I understood very
well how badly it can hurt to work with bad ones.
It didn't really improve when KO left the building either...
Johnny
