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04-14-2006 03:19 AM
04-14-2006 03:19 AM
testing by physically disconnecting the
ethernet cable before booting.
I've noticed that TCPIP pauses near the
end of its startup and waits about 5
minutes before continuing. I've tried
inserting a turn-around ethernet plug
but there is still a pause.
1) What thing (or things) is TCPIP
startup trying to do at that point?
2) What timer(s) affect the above?
3) What's the simplest way to reduce
this pause?
Thanks all
Solved! Go to Solution.
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04-14-2006 03:55 AM
04-14-2006 03:55 AM
Re: TCPIP Pause At Startup
Are all service started wit 'normal' performance before that? May be something is waiting to connect to an outside server?
regards Kalle
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04-14-2006 04:31 AM
04-14-2006 04:31 AM
Re: TCPIP Pause At Startup
Parhaps there is a DNS lookup being performed.
Purely Personal Opinion
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04-14-2006 05:19 AM
04-14-2006 05:19 AM
Re: TCPIP Pause At Startup
> startup trying to do at that point?
Perhaps - attempting to establish a connection to your default router and update the routing table?
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04-14-2006 05:33 AM
04-14-2006 05:33 AM
Re: TCPIP Pause At Startup
what you could try to isolate this, is:
Edit SYSTARTUP_VMS.COM:
$ SET PREFIX "(!5%T) "
$ SET VERIFY
$ @SYS$STARTUP:TCPIP$STARTUP.COM/OUT=TCPIP_STARTUP.LOG
$ SET NOVERIFY
and every DCL command line will be shown prefixed with the time in the .LOG file.
Volker.
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04-17-2006 07:10 PM
04-17-2006 07:10 PM
Re: TCPIP Pause At Startup
It must be something specific for your site (NFS ? Setting in sysconfigtab.dat ?).
Wim
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04-17-2006 07:24 PM
04-17-2006 07:24 PM
Re: TCPIP Pause At Startup
Are you using SMTP? I have noticed a similar
issue on some of my systems (my wait is about
8 minutes) and I tracked it down to starting
the SMTP queues... don't know exactly what it
was doing but that is where my systems were
waiting.
Dave
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04-17-2006 08:24 PM
04-17-2006 08:24 PM
Re: TCPIP Pause At Startup
Wim
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04-17-2006 08:36 PM
04-17-2006 08:36 PM
SolutionWe made this mod to our DR test plan, because effectively 'the cable is unplugged' and a reboot can take 10 minutes (as you said) :-
"13.10. Name Servers
In a test situation, or live invocation only one Domain Controller would be available, probably CODC-3.
The IP stack on the Alphaâ s is configured to look at all Domain Controllers, which means the time to return information is extended because of the timeouts required.
To ensure the lookups are as fast as possible, any DNS servers that are not operational should be removed from the list.
The list can be displayed by typing â $ TCPIP SHOW NAMEâ , and looking at the â serversâ field.
To change this, type â $ TCPIP SET NAME /NOSERVER=server_to_removeâ and â $ TCPIP SET CONFIG NAME /NOSERVER=server_to_removeâ , to make the change permanent."
Rob.
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04-17-2006 09:39 PM
04-17-2006 09:39 PM
Re: TCPIP Pause At Startup
I would not recommend speculating as to what is happening. The science to determine the correct answer is not particularly complex. In addition, the same external behavior can be caused by many different actual problems (a problem that physicians are all too aware of).
The way to identify what communication is being attempted is to use a network monitor on the otherwise unconnected line to determine what IS happening, not what might be happening.
This used to be a question of non-trivial budgets, but tools like Ethereal ( http://www.ethereal.com ) are zero cost.
Capture the traffic emnating from the subject node with a sniffer and you will know precisely what the node is attempting.
- Bob Gezelter, http://www.rlgsc.com
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04-17-2006 09:58 PM
04-17-2006 09:58 PM
Re: TCPIP Pause At Startup
If You disconnect the cable, then I assume You have access to the console and can do a conversational bootstrap to set and reset the system parameters.
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04-19-2006 08:57 AM
04-19-2006 08:57 AM
Re: TCPIP Pause At Startup
Within the next week I should be able to try some tests. I will enable VERIFICATION
for TCPIP startup as one test.
In ref to ethernet sniffing - any way to use TCPTRACE from the host I'm booting? I realize this is like a chicken&egg (ie why should TCPTRACE be available before TCPIP startup completes?), but with the host off of the network, I can't run another box to sniff it.
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04-19-2006 06:53 PM
04-19-2006 06:53 PM
Re: TCPIP Pause At Startup
you might be able to use tcpdump to trace all IP packets into (should be none if the NIC is disconnected) and out of your node.
$ @SYS$MANAGER:TCPIP$DEFINE_COMMANDS
$ SPAWN/NOWAIT tcpdump
TCPTRACE might also work, but you need to send output to a file and specify a high number for /PACKETS.
Try both methods manually first.
You certainly can't start tcpdump or tcptrace, before TCPIP is up, but you need to add those trace start commands into some of the TCPIP startup procedure ONCE you've figured out, where it hangs... Then add the start trace command in some procedure executed BEFORE that hang.
Volker.
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04-19-2006 08:05 PM
04-19-2006 08:05 PM
Re: TCPIP Pause At Startup
As you can see from the example below, you'll get enough information from OPA0 to determine which module is giving problems :-
%%%%%%%%%%% OPCOM 8-NOV-2005 16:39:20.64 %%%%%%%%%%%
Message from user INTERnet on ALPHA
INTERnet ACP Activate RSH Server
%%%%%%%%%%% OPCOM 8-NOV-2005 16:39:51.56 %%%%%%%%%%% (from node BETA at
8-NOV-2005 16:39:51.24)
Message from user SYSTEM on BETA
%SMHANDLER-S-STARTUP, server management event handler startup
%%%%%%%%%%% OPCOM 8-NOV-2005 16:48:48.30 %%%%%%%%%%%
Message from user INTERnet on ALPHA
INTERnet ACP Activate SMTP Server
%TCPIP-S-STARTDONE, TCPIP$SMTP startup completed
%%%%%%%%%%% OPCOM 8-NOV-2005 16:48:48.72 %%%%%%%%%%%
Message from user INTERnet on ALPHA
INTERnet ACP Activate SNMP Server
You then need to work out why, which is almost certainly DNS related for these sort of delays.
What you need to start thinking about is how you can change the settings, i.e. remove unknown DNS servers before you boot the system.
Perhaps you could store a default version of the config file, and rename this over when you unplug your NIC cable?
Rob.
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06-27-2007 12:35 AM
06-27-2007 12:35 AM
Re: TCPIP Pause At Startup
I booted with no networks.
In hang for 3min30.
Jack : did you find the solution ?
Wim
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06-27-2007 12:37 AM
06-27-2007 12:37 AM
Re: TCPIP Pause At Startup
Robert.
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06-27-2007 01:01 AM
06-27-2007 01:01 AM
Re: TCPIP Pause At Startup
I redid the boot with a tcptrace to sys$output. But it didn't work because you can not start tcptrace before tcpip.
So I did my interactive trace during startup of tcpip (trace for protocol IP). Not 1 record was shown. At the end of the startup (thus after the hang, records with to=from=127.0.0.1 were shown.
Wim
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06-27-2007 01:02 AM
06-27-2007 01:02 AM
Re: TCPIP Pause At Startup
Wim
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06-27-2007 01:08 AM
06-27-2007 01:08 AM
Re: TCPIP Pause At Startup
Rob.
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06-27-2007 01:14 AM
06-27-2007 01:14 AM
Re: TCPIP Pause At Startup
Wim
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06-27-2007 01:21 AM
06-27-2007 01:21 AM
Re: TCPIP Pause At Startup
ucx start mail will go in hang when DNS is enabled. If you disable it, everything goes fine.
Wim
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06-27-2007 01:26 AM
06-27-2007 01:26 AM
Re: TCPIP Pause At Startup
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06-27-2007 01:52 AM
06-27-2007 01:52 AM
Re: TCPIP Pause At Startup
Thought that's what I'd said??
This is the text I wrote for my DR plan :-
"If the DNS server is not available when the system is booted, the boot will hang trying to start SMTP for 10 minutes until it reaches the timeout. To prevent this, action the following commands.
@SYS$MANAGER:TCPIP$CONFIG
Select 2 â Client Components
Select 6 â SMTP
Select 1 â Disable Service"
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06-27-2007 02:37 AM
06-27-2007 02:37 AM
Re: TCPIP Pause At Startup
Still curious if there is a way to decrease the time to less than 1 minute.
Wim
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06-27-2007 02:40 AM
06-27-2007 02:40 AM
Re: TCPIP Pause At Startup
A lot of other people have used the SYSGEN user startup parameters to load information into, then interrogate at boot time. Perhaps you could try that?