Re: TCP/IP Hangs with 2.2.5 on High Load Server

Alan Cox (alan@lxorguk.ukuu.org.uk)
Wed, 25 Aug 1999 12:22:07 +0100 (BST)


> instances from certain PC's, randomly, where there is no longer any
> connectivity to the server. We can't ping the server, and from the
> server, we can't ping the workstation. A ping flood on either of them
> sometimes fixes the problem. This has gotten to be a pretty big problem,

What does tcpdump show during this situation, when run on the Linux end.
Losing just a specific machine is very odd and can often point to a problem
with a switch/bridge in the middle. Its just you normally lose them when
the net is idle in that case

> What kind of network tools can we use to troubleshoot this, and what kind
> of information should I get available if it turns out to be a problem with
> Linux?

Look with tcpdump (you can tell it to watch one ip address only) see if
you are getting packets from the PC. If you have a sniffer for the PC client
end see if you are getting the replies. Basically you firstly need to know
where the packet disappeared

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