7 Sep
2025
7 Sep
'25
5:21 p.m.
Well, your doing the calculation wrong. Or rather, the calculation as
such is correct, but you have the byte order wrong. :)
But yes, when VMS boots, it is supposed to change the MAC address
anyway, and so it supposedly (hopefully) don't matter, as simh is trying
to emulate the MAC address change correctly.
Are you attaching other simh instances also to tap? Same or different
number? What did you do the tcpdump against?
Johnny
On 2025-09-07 17:12, Brian Roth wrote:
Yes, I used to do the calculations but I found it really didn’tmatter.
I actually have one where the MAC address is commented out and it works
fine.
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On Sunday, September 7, 2025, 10:52 AM, Johnny Billquist
<bqt(a)softjar.se> wrote:
Uh?
AA-00-04-00-7D-1A equals a DECnet address of 6.637. That is probably
not
going to help...
Any reason why you set that. And do you have equally crazy MAC
addresses
for your other simh instances (and it works on those?)?
Johnny
On 2025-09-07 16:14, Brian Roth wrote:
them. They
are
<mailto:bqt@softjar.se> <mailto:bqt@softjar.se>
<mailto:tohecnet-leave@lists.dfupdate.se>
<mailto:tohecnet-leave@lists.dfupdate.se>
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt(a)softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
When I first had trouble with it I assumed maybe
some bad install
media
so I decided to try again with a 5.5 iso image.
It still did not
work.
It does indeed work on the other pi now and I
used this ini file
throughout.
; SIMH configuration for MicroVAX II *** SCOOBY ***
; ---- CPU ----
SET CPU 16M
SET CPU CONHALT
SET CPU IDLE=VMS
SET CPU AUTOBOOT
ATT NVR ../data/NVR.BIN
SET CONSOLE LOG=scooby.log
; ---- DISKS ----
SET RQ0 ENABLE
SET RQ0 RD54
ATT RQ0 ../data/VMS055.R54
SET RQ1 ENABLE
SET RQ1 RX50
SET RQ2 ENABLE
SET RQ2 RX50
SET RQ3 RD54
ATT RQ3 ../data/vms552h4.iso
;SET DZ LINES=4
;ATT DZ 6666
; ---- TAPE ----
;SET TQ0 ENABLE
;ATT TQ0 ../data/AQ-FP13D-BN_MICROVMS_4.6_87.tap
SET TQ1 DISABLE
SET TQ2 DISABLE
SET TQ3 DISABLE
SET LPT DISABLE
SET RL DISABLE
SET TS DISABLE
; ---- Networking ----
set xq mac=AA-00-04-00-7D-1A
attach xq tap:tap0
;AutoBoot
;EXPECT ">>> " SEND "BOOT\r"
;BOOT
Brian
On Saturday, September 6, 2025 at 11:45:31 PM EDT, Johnny Billquist
<bqt(a)softjar.se <mailto:bqt@softjar.se>> wrote:
So could you show the simh ini file for the failed instance?
Johnny
On 2025-09-07 05:18, Brian Roth wrote:
> OK. I cannot figure why but for some reason, if I build the
nodes on
> working Pi's and then transfer the
files over to the Pi's with
the non-
> working nodes, they communicate. And
vice-versa, non-working
nodes stay
> non-working on the good Pi's. They are
all updated, using 4.x
version of
> simh, same compilers etc. At least I have a
work around.
>
> BTW Terry All of the NCP info was exactly the same. I did the
> calculations and verified the scssystemid in modparams,
stripped theini
> files to the bare minimum to no avail.
> Brian.
>
>
> On Saturday, September 6, 2025 at 05:58:01 PM EDT, Terri
Kennedy
<terri-
> hecnet(a)glaver.org
<mailto:hecnet@glaver.org>
<mailto:hecnet@glaver.org>> wrote:
>
>
> [I mistakenly sent this reply to an address not subscribed to
the
list.]
>
> On 2025-09-06 16:30, Brian Roth wrote:
>
> > This is really kicking me. I have a rack with 5 Pi's in it.
All are
>
going to the same switch. 2 of them have 4 simh instances each
that are
> > working fine (DECNET). TCP-IP is working fine onall of > > all wired. On the Pi thats running
SCOOBY I created a
11/780running
> > VMS 5.5. It does not communicate as
well even though it
sayscircuitup
> > (same problem as SCOOBY) OK, I
created another instance on
an entirely
> > different Pi with the same results. I
have changed around
the assigned
> > MAC address's in the simh ini
files, swapped switch ports.
Running out
> > of idea's here. I have Wireshark
on one of the Pi's but haveno
> > experience using it. Guess I better learn.
>
> Remember, DECnet (assuming Phase IV) is going to change the
MAC address
> to one derived from the assigned DECnet
address. The DECnet
address
> should also match SCSSYSTEMID, although I
believe it will
complain if
> they don't.
>
> Unique MAC addresses in the SIMH config prevent multiplenodes
from
> clashing with each other before DECnet
starts, as well as
confusing the
> switche(s) that the nodes are connected
to.
>
> > On Friday, September 5, 2025 at 02:10:04 PM EDT,Johnny
Billquist
> > <bqt(a)softjar.se
<mailto:bqt@softjar.se>
<mailto:bqt@softjar.se>
<mailto:bqt@softjar.se>>
wrote:
> >
> > I would probably guess at a problem with the actual MAC
address
usedby
> > that MicroVMS system, but it's
pretty hard to troubleshoot this
> > remotely.
> >
> > But it's very clear that all the other nodes arenot seeing
31.282 as
> > up, and so any communication will be
failing.
> >
> > Other possible problems could be if the connection to the
outside
> > network is actually configured
differently on this instance
than the
> > others, for example.
> >
> > Trying to think of other possible problems it could be.
Maybe
posting
> > the simh config for the failing
machine, as wellas for one
working,
> > could be helpful.
> >
> > Johnny
> >
> > On 2025-09-05 20:04, Johnny Billquist wrote:
> >> I've seen issues sometimes, but I don't know the full
extent of what
> >> the
> >> exact results might be.
> >>
> >> But don't matter. Now we know they are all simhinstances.
> >>
> >> Johnny
> >>
> >> On 2025-09-05 19:57, Paul Koning wrote:
> >>> I thought SQE failure is only a warning and would not
stopthe
device
> >>> from working.
> >>>
> >>> pul
> >>>
> >>>> On Sep 5, 2025, at 1:27 PM, Johnny Billquist
<bqt(a)softjar.se <mailto:bqt@softjar.se>
<mailto:bqt@softjar.se>
> <mailto:bqt@softjar.se>>wrote:
> >>>>
> >>>> That's one possibility. Another if he's running on some
kind of
> >>>> emulator on a system that
don't actually allow
programmatic change
> >>>> of
> >>>> the MAC address, and you need to set the MAC correctly inthe
> >>>> emulator before starting up. And if it is real hardware,
is it
> >>>> connected to some switch
then?10baseT? Does he have an
adapter that
> >>>> can do SQE?
> >>>>
> >>>> There are many possible ways things could notwork. What
we can see
> >>>> isjust that incoming
broadcast/multicast packets work,
but so far
> >>>> nothing else.
> >>>>
> >>>> Johnny
> >>>>
> >>>> On 2025-09-05 19:22, Paul Koning wrote:
> >>>>> Is it WiFi? That doesn't work with DECnet MAC
addresses (it
> >>>>> doesn't
> >>>>> like it when the NIC changes its address to
aa-00-04-00-xx-yy).
> >>>>> paul
> >>>>>> On Sep 5, 2025, at 1:14 PM, Johnny Billquist
<bqt(a)softjar.se <mailto:bqt@softjar.se>
<mailto:bqt@softjar.se>
> <mailto:bqt@softjar.se>>
> >>>>>> wrote:
> >>>>>>
> >>>>>> Well, GEEZER (31.278) is not seeing 31.282 as up. So
that's why
> >>>>>> you
> >>>>>> have a problem. This usually means that packets are
working
in one
> >>>>>> direction, but not the other.
> >>>>>>
> >>>>>> Was this a real machine? How have you connected it to
the rest of
> >>>>>> the network?
> >>>>>>
> >>>>>> Johnny
> >>>>>>
> >>>>>> On 2025-09-05 18:45, Brian Roth wrote:
> >>>>>>> The address is 31.282. No File access, Phone or NCP
Tell to
other
> >>>>>>> nodes but it is still able to go out and find a
router. It
> >>>>>>> (31.282) can
phone itself and set host butother
nodesit just
> >>>>>>> hangs. If I
phone anothernode it will justsit at
"Establishing
>>>>>>> Decnet Link and then error to "Node is notreachable.
>>>>>>> Brian.
>>>>>>> On Friday, September 5, 2025 at 12:38:11 PM EDT, Johnny
Billquist
> >>>>>>> <bqt(a)softjar.se <mailto:bqt@softjar.se>
> <mailto:bqt@softjar.se>> wrote:
> >>>>>>> No. Qbus ethernet or Unibus ethernet makesno
difference here.
> >>>>>>> Does anything
else work? NCP to other nodes? Phone?
File access?
> >>>>>>> What's
the address of that microvax?
> >>>>>>> Johnny
> >>>>>>> On 2025-09-05 17:59, Brian Roth wrote:
> >>>>>>>> Hello, I currently have 8 simh vax machines on
Hecnetall
> >>>>>>>> working
> >>>>>>>> fine.
> >>>>>>>> Its a mix of machines running VMS 3.5 to 7.3 and
while some
were
> >>>>>>>> abit
> >>>>>>>> of a challenge they all talk. I recently
configured
aMicrovax
> >>>>>>>> II
> >>>>>>>> with
> >>>>>>>> MicroVMS 4.6 as well as Decnet 4.6 and assigned
it
tomy area
> >>>>>>>> 31.
> >>>>>>>> The
> >>>>>>>> network loads without errors and I am able to SET
HOST to
itself
> >>>>>>>> butto
> >>>>>>>> no other nodes in my area or vice versa. SHOW
KNOWN
CIRCUITS
> >>>>>>>> showsthe
> >>>>>>>> hosts I manually defined. SHOW KNOWN CIRCUITS
CHARACTERISTICS
> >>>>>>>> showsa
> >>>>>>>> designated router in my area so its finding that.
If
I bring a
> >>>>>>>> router
> >>>>>>>> node down it successfully finds another in the
area.
> >>>>>>>>
> >>>>>>>> The microvax node:
> >>>>>>>>
> >>>>>>>> Known Circuit Volatile Characteristics asof
5-SEP-1987
> >>>>>>>> 11:37:16
> >>>>>>>>
> >>>>>>>> Circuit = QNA-0
> >>>>>>>>
> >>>>>>>> State = on
> >>>>>>>> Service = disabled
> >>>>>>>> Designated router = 31.278
> >>>>>>>> Cost =4
> >>>>>>>> Router priority =64
> >>>>>>>> Hello timer = 15
> >>>>>>>> Type = Ethernet
> >>>>>>>> Adjacent node =31.278
> >>>>>>>> Listen timer = 45
> >>>>>>>>
> >>>>>>>> The working nodes match with the exception of the
circuit. All
> >>>>>>>> theother
> >>>>>>>> machines are UNA-0 (UNIBUS) and this one is of
courseQNA-0
> >>>>>>>>
Couldthis
> >>>>>>>> be the problem?
> >>>>>>>>
> >>>>>>>> Brian.
> >>>>>>>>
> >>>>>>>>
> >>>>>>>> _______________________________________________
> >>>>>>>> HECnet mailing list --hecnet(a)lists.dfupdate.se
<mailto:--hecnet@lists.dfupdate.se> <mailto:--
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>>>>>>>>
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> >>>>>>> --
> >>>>>>> Johnny Billquist || "I'm on a
bus
> >>>>>>> || on a psychedelic trip
> >>>>>>> email:bqt@softjar.se
> >>>>>>>
<mailto:bqt@softjar.se><mailto:bqt@softjar.se
> >>>>>>> <mailto:bqt@softjar.se>> || Reading
murder
books
> >>>>>>> pdp is
alive! || tryin' to stay
hip" - B.
> >>>>>>> Idol
> >>>>>>> _______________________________________________
> >>>>>>> HECnet mailing list --hecnet(a)lists.dfupdate.se
<mailto:--hecnet@lists.dfupdate.se> <mailto:--
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<mailto:hecnet@lists.dfupdate.se>>
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>>>>>>>
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>>>>>>>
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>>>>>>> To unsubscribe send an email tohecnet-
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> >>>>>>
> >>>>>> --
> >>>>>> Johnny Billquist || "I'm on a bus
> >>>>>> || on a psychedelic trip
> >>>>>> email: bqt(a)softjar.se <mailto:bqt@softjar.se>
<mailto:bqt@softjar.se>
<mailto:bqt@softjar.se> ||
> Reading murder books
> >>>>>> pdp is alive! || tryin' to stay
hip" - B. Idol
> >>>>>>
> >>>>>> _______________________________________________
> >>>>>> HECnet mailing list -- hecnet(a)lists.dfupdate.se
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> > >>>>
> > >>>> --
> > >>>> Johnny Billquist || "I'm on a
bus
> > >>>> || on a psychedelic trip
> > >>>> email: bqt(a)softjar.se <mailto:bqt@softjar.se>
<mailto:bqt@softjar.se>
<mailto:bqt@softjar.se> ||
> Reading murder books
> >>>> pdp is alive! || tryin' to stay hip"
- B. Idol
> >>>>
> >>>> _______________________________________________
> >>>> HECnet mailing list -- hecnet(a)lists.dfupdate.se
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> > >>>
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> > >>> HECnet mailing list -- hecnet(a)lists.dfupdate.se
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> > >>
> > >
> > > --
> > > Johnny Billquist || "I'm on a bus
> > > || on a psychedelic trip
> > > email: bqt(a)softjar.se <mailto:bqt@softjar.se>
<mailto:bqt@softjar.se>
<mailto:bqt@softjar.se>
|| Reading
> murder books
> > pdp is alive! || tryin' to stay hip" - B.
Idol
> >
> > _______________________________________________
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--
Johnny Billquist || "I'm on a bus
|| on apsychedelic trip
email: bqt(a)softjar.se <mailto:bqt@softjar.se>
<mailto:bqt@softjar.se> || Reading
murder books
pdp is alive! || tryin' to stay hip" - B. Idol
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|| on a psychedelic trip
email: bqt(a)softjar.se <mailto:bqt@softjar.se> || Reading
murder books
pdp is alive! || tryin' to stay hip" - B. Idol
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