HECnet September 2011

hecnet@lists.dfupdate.se

29 participants
224 discussions

by HECNET＠beyondthepale.ie

It should happen before disk access across the CI bus is even possible. I think we'll have to agree to disagree on this one :-) I've just booted my Vaxstation 2000 into an NI cluster with my Vaxstation 3100. I gave the commands: NCP SET CIRCUIT SVA-0 STATE OFF NCP SET CIRCUIT SVA-0 STATE ON on each node. The only effects were an opcom message complaining about adjacency down and the loss of my decnet connections. Both nodes continued to function quite happily while the circuit was off. No crash. Anyway, it looks like avoiding issueing the SET CIRCUIT STATE OFF command by making the changes to the permanent database and rebooting was a good way of sidestepping the problem. Hopefully the bug is only triggered when SET CIRCUIT STATE OFF is issued in Marks setup. Apologies to gerry77. I missed your reply earlier and ended up repeating much of what you said. Regards, Peter Coghlan.

13 years, 2 months

Alternatives to bridge when running via a dynamic IP address

by jeep＠scshome.net

Actually, who cares. All of this happens at this end. I can tell this end to do the lookup every second if I wish. In reality it is usually done in some number of minutes. As for the reboot, that's why it is a dedicated machine. It can reboot as often as it needs to - I don't depend on it except to provide connectivity to this site from remote sites that have dynamic IP addresses. The actual reboot is only a few minutes. This entire process is automated and it is able to inform via email (delayed using NMAIL) anyone necessary that their was a change in state (address). -Steve -----Original Message----- From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On Behalf Of Johnny Billquist Sent: Thursday, September 15, 2011 17:46 To: hecnet at Update.UU.SE Subject: Re: [HECnet] Alternatives to bridge when running via a dynamic IP address The question is how long does it take to detect, and is a reboot every time acceptable? Johnny On 2011-09-15 23:40, Steve Davidson wrote: This issue has been dealt with here. The declab.net site runs a dedicated VAX with Multinet that polls the other end at predetermined intervals. When the other ends' address changes this end makes change to the Multinet database and reboots. This software has been in use for well over a year and appears to work very well. It does require the use of DynDNS at the end that changes addresses so that this end can do the lookup. -Steve -----Original Message----- From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On Behalf Of Mark Wickens Sent: Thursday, September 15, 2011 17:14 To: hecnet at Update.UU.SE Subject: Re: [HECnet] Alternatives to bridge when running via a dynamic IP address On 15/09/11 22:03, hvlems at zonnet.nl wrote: Won't the IP address remain unchanged as long as you keep the router up and running? Or would thet be too costly? ------Origineel bericht------ Van: Mark Wickens Afzender: owner-hecnet at Update.UU.SE Aan: hecnet at Update.UU.SE Beantwoorden: hecnet at Update.UU.SE Onderwerp: [HECnet] Alternatives to bridge when running via a dynamic IP address Verzonden: 15 september 2011 22:53 Guys, Might as well explore this as an option. The 3G network enabled Vigor 2800 router that I will be using at the DEC Legacy event appears to be working reasonably well, but unsurprisingly there does appear to be some fluctuation in the IP address. This means that an alternative to Johnny's bridge program might be called for. I have a dynamic DNS reference set up and now updating periodically, hecnet.no-ip.org, the question is what can I use as an alternative to the bridge program which will cope with IP address changes? I seem to remember Multinet tunnels being mentioned in the past, do they support dnydns, or any other technology? Thanks for the help, Mark. Unfortunately not. I've seen three IP address changes in about the same number of hours. I don't know whether this poor performance is down to the completely haphazard location of the dongle, or whether it's always this rubbish but you don't realise when all you're doing is browsing the internet. My experience of using a 3G dongle for anything other than web browsing is very limited! Regards Mark. -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol

13 years, 2 months

Another thought regarding dynamic bridge setup

by mark＠wickensonline.co.uk

Just thinking aloud, Can I run a bridge between the dongle based network and my own home network? If the bridge program on my network is wrapped with a script which checks the dyndns hostname periodically against the recorded IP address, cannot I not reconfigure the bridge on my home network and restart it if required? If this is possible it keeps my configuration in a realm I've got half a chance of working out myself and saves me from hassling anyone else. Presumably at home I would need to run two bridges on different ports - with the current bridge linking back to Johnny as normal. Regards, Mark

13 years, 2 months

Alternatives to bridge when running via a dynamic IP address

by bqt＠softjar.se

The question is how long does it take to detect, and is a reboot every time acceptable? Johnny On 2011-09-15 23:40, Steve Davidson wrote: This issue has been dealt with here. The declab.net site runs a dedicated VAX with Multinet that polls the other end at predetermined intervals. When the other ends' address changes this end makes change to the Multinet database and reboots. This software has been in use for well over a year and appears to work very well. It does require the use of DynDNS at the end that changes addresses so that this end can do the lookup. -Steve -----Original Message----- From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On Behalf Of Mark Wickens Sent: Thursday, September 15, 2011 17:14 To: hecnet at Update.UU.SE Subject: Re: [HECnet] Alternatives to bridge when running via a dynamic IP address On 15/09/11 22:03, hvlems at zonnet.nl wrote: Won't the IP address remain unchanged as long as you keep the router up and running? Or would thet be too costly? ------Origineel bericht------ Van: Mark Wickens Afzender: owner-hecnet at Update.UU.SE Aan: hecnet at Update.UU.SE Beantwoorden: hecnet at Update.UU.SE Onderwerp: [HECnet] Alternatives to bridge when running via a dynamic IP address Verzonden: 15 september 2011 22:53 Guys, Might as well explore this as an option. The 3G network enabled Vigor 2800 router that I will be using at the DEC Legacy event appears to be working reasonably well, but unsurprisingly there does appear to be some fluctuation in the IP address. This means that an alternative to Johnny's bridge program might be called for. I have a dynamic DNS reference set up and now updating periodically, hecnet.no-ip.org, the question is what can I use as an alternative to the bridge program which will cope with IP address changes? I seem to remember Multinet tunnels being mentioned in the past, do they support dnydns, or any other technology? Thanks for the help, Mark. Unfortunately not. I've seen three IP address changes in about the same number of hours. I don't know whether this poor performance is down to the completely haphazard location of the dongle, or whether it's always this rubbish but you don't realise when all you're doing is browsing the internet. My experience of using a 3G dongle for anything other than web browsing is very limited! Regards Mark. -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol

13 years, 2 months

Alternatives to bridge when running via a dynamic IP address

by jeep＠scshome.net

This issue has been dealt with here. The declab.net site runs a dedicated VAX with Multinet that polls the other end at predetermined intervals. When the other ends' address changes this end makes change to the Multinet database and reboots. This software has been in use for well over a year and appears to work very well. It does require the use of DynDNS at the end that changes addresses so that this end can do the lookup. -Steve -----Original Message----- From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On Behalf Of Mark Wickens Sent: Thursday, September 15, 2011 17:14 To: hecnet at Update.UU.SE Subject: Re: [HECnet] Alternatives to bridge when running via a dynamic IP address On 15/09/11 22:03, hvlems at zonnet.nl wrote: Won't the IP address remain unchanged as long as you keep the router up and running? Or would thet be too costly? ------Origineel bericht------ Van: Mark Wickens Afzender: owner-hecnet at Update.UU.SE Aan: hecnet at Update.UU.SE Beantwoorden: hecnet at Update.UU.SE Onderwerp: [HECnet] Alternatives to bridge when running via a dynamic IP address Verzonden: 15 september 2011 22:53 Guys, Might as well explore this as an option. The 3G network enabled Vigor 2800 router that I will be using at the DEC Legacy event appears to be working reasonably well, but unsurprisingly there does appear to be some fluctuation in the IP address. This means that an alternative to Johnny's bridge program might be called for. I have a dynamic DNS reference set up and now updating periodically, hecnet.no-ip.org, the question is what can I use as an alternative to the bridge program which will cope with IP address changes? I seem to remember Multinet tunnels being mentioned in the past, do they support dnydns, or any other technology? Thanks for the help, Mark. Unfortunately not. I've seen three IP address changes in about the same number of hours. I don't know whether this poor performance is down to the completely haphazard location of the dongle, or whether it's always this rubbish but you don't realise when all you're doing is browsing the internet. My experience of using a 3G dongle for anything other than web browsing is very limited! Regards Mark.

13 years, 2 months

Satellite configuration/NCP crash

by hvlems＠zonnet.nl

It should happen before disk access across the CI bus is even possible. ------Origineel bericht------ Van: Mark Wickens Afzender: owner-hecnet at Update.UU.SE Aan: hecnet at Update.UU.SE Beantwoorden: hecnet at Update.UU.SE Onderwerp: Re: [HECnet] Satellite configuration/NCP crash Verzonden: 15 september 2011 23:29 On 15/09/11 22:27, Peter Coghlan wrote: Unless youLre running an NI cluster. If PEDRIVER is loaded shutting the decnet circuit used by it must crash the node. I would have thought that shutting off decnet will not affect SCS traffic. If it happend that it did, AND there were two or more nodes in the cluster trying to communicate and failing, I would expect one or more nodes that lost quorum to hang for RECNXINTERVAL seconds (by default, 20). After that, one or modes might bugcheck with a CLUEXIT exception. A SSRVEXCEPT exception much more likely indicates something is wrong with the software. Regards, Peter Coghlan. If it helps in the discussion the crash happened very quickly.

13 years, 2 months

Satellite configuration/NCP crash

by hvlems＠zonnet.nl

In a scsi cluster the cluster traffic is passed across another bus, like FDDI, ethernet (and possibly memory channel). That is the main difference between SCSI and DSSI. Likewise there is mo decnet over scsi as there is decnet over dssi (and the older CI) ------Origineel bericht------ Van: Peter Coghlan Afzender: owner-hecnet at Update.UU.SE Aan: hecnet at Update.UU.SE Beantwoorden: hecnet at Update.UU.SE Onderwerp: Re: [HECnet] Satellite configuration/NCP crash Verzonden: 15 september 2011 23:27 Unless youLre running an NI cluster. If PEDRIVER is loaded shutting the decnet circuit used by it must crash the node. I would have thought that shutting off decnet will not affect SCS traffic. If it happend that it did, AND there were two or more nodes in the cluster trying to communicate and failing, I would expect one or more nodes that lost quorum to hang for RECNXINTERVAL seconds (by default, 20). After that, one or modes might bugcheck with a CLUEXIT exception. A SSRVEXCEPT exception much more likely indicates something is wrong with the software. Regards, Peter Coghlan.

13 years, 2 months

Alternatives to bridge when running via a dynamic IPaddress

by mark＠wickensonline.co.uk

On 15/09/11 22:23, hvlems at zonnet.nl wrote: Which is where a dongle was originally designed for: occasionally browsing Inteernet resources where stability of the transmission pipe over any extended interval is unnecessary. Simply put a dongle is not an infrastructure component. There's no friendly neighbour to help you out? Possibly. The alternative is a local company, but they don't have a fixed IP address either. Obviously over an ADSL connection we are more likely to get a reliable IP address. However, the problem with this solution is that configuring NAT was an issue last time - they're router was managed by an external company, which put a spanner in the works at the time... However, it might be worth a try again. Regards, Mark.

13 years, 2 months

Satellite configuration/NCP crash

by mark＠wickensonline.co.uk

On 15/09/11 22:27, Peter Coghlan wrote: Unless youLre running an NI cluster. If PEDRIVER is loaded shutting the decnet circuit used by it must crash the node. I would have thought that shutting off decnet will not affect SCS traffic. If it happend that it did, AND there were two or more nodes in the cluster trying to communicate and failing, I would expect one or more nodes that lost quorum to hang for RECNXINTERVAL seconds (by default, 20). After that, one or modes might bugcheck with a CLUEXIT exception. A SSRVEXCEPT exception much more likely indicates something is wrong with the software. Regards, Peter Coghlan. If it helps in the discussion the crash happened very quickly.

13 years, 2 months

Satellite configuration/NCP crash

by HECNET＠beyondthepale.ie

Unless youLre running an NI cluster. If PEDRIVER is loaded shutting the decnet circuit used by it must crash the node. I would have thought that shutting off decnet will not affect SCS traffic. If it happend that it did, AND there were two or more nodes in the cluster trying to communicate and failing, I would expect one or more nodes that lost quorum to hang for RECNXINTERVAL seconds (by default, 20). After that, one or modes might bugcheck with a CLUEXIT exception. A SSRVEXCEPT exception much more likely indicates something is wrong with the software. Regards, Peter Coghlan.

13 years, 2 months

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HECnet September 2011