NIC not coming up when Ethernet Cable is replugged

[David Schulz]

Hello all,

i am having a strange Problem, which was more apparent under FreeBSD  
5.5 and 6.0, but still happens to me under 6.1, on different machines  
with different NIC`s.

Basically when during the day something happens to my Machines  
Network Connection, for example someone pulls out the Cable, when it  
is re-plugged in, sometimes it doesn't become active anymore. It  
doesn't says No Carrier under ifconfig, but the Machine cannot be  
pinged and also cannot ping another host. Restarting the Machine is  
no help.Helping is logging in as root, and issuing a ifconfig vr0  
down followed by a ifconfig vr0 up. Then there is a console message  
saying vr0: Using force reset command. After that everything works  
again as usual. For some machines this is a real problem for me  
because they dont have Keyboard Mouse or Monitor, and i cant get in  
remotely.

Thanks for any Ideas,

David