[Xen-users] Ethernet has Alzheimers

[Johannes Ernst <johannes.ernst@xxxxxxxxx>]

This may be a XEN problem, a Linux problem, or a driver problem, or a  
setup problem, I don't know what, and we're about at our wits' end.  
Any and all help and thoughts appreciated.
This machine is currently getting very little traffic (because it is  
being set up).
After some time of no activity, it refuses to talk to me from home  
(ping, ssh, http, anything ..)
However, talking to it from another server on the local subnet works  
fine.
The kicker: after I have talked to it from the subnet, it THEN again  
immediately talks to anybody, regardless from where.
Until something times out. The "something" is my problem.

Funnily enough, this behavior is the exact same for dom0 and all  
domu's, and independent from each other: I might be able to talk to a  
domu just fine, while at the same time, it refuses to talk to me on  
dom0 -- both of which run over the same network card! They all have  
different IP addresses.
A lot of debugging seems to indicate that the interface "forgets" it  
IP address after nobody talked to it for a while. It appears that the  
traffic arrives but the box ignores it. It also appears that broadcast  
messages on the subnet (particular ARP) make it "remember". The  
difference in behavior between local and remote client might be  
accounted for the fact that the router to the subnet has a longer ARP  
cache timeout than any local server.
Running Debian etch 2.6.18-5-xen-amd64 on a KN9 SLI motherboard that  
includes Nvidia dual Gigabit Ethernet on-board.
Thank you if you have any insights!!!



Johannes.

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