Connection remains in the ESTABLISHED state when the virtual IP is down.

Hello,

I encountered following issue:
when I connect with NFS server through virtual IP then I remove this IP netstat still shows that connection is ESTABLISHED. When I put down whole interface all ESTABLISHED connections disappear. The kernel version is 3.10.92.

How to reproduce.

create virtual IP:

ip addr add 88.88.88.1/24 dev eth0 label eth0:0 (or ifconfig eth0:0 88.88.88.1)

then make connection from the NFS client. In netstat there is:
tcp 0 0 88.88.88.1:2049 88.88.88.2:765 ESTABLISHED-

and delete virtual IP:
ip addr del 88.88.88.1/24 dev eth0 (or ifconfig eth0:0 down)

the netstat still shows that conneciton is ESTABLISHED and remains in that state for about 5 minutes. Even if I recreate virtual IP I can't access to the server until it disappears.

When the whole interface is put down (ifconfig eth0 down) the netstat doesn't show any entries for my virtual IP and if I put it up again I can access to the server immediately.

Shouldn't the ESTABLISHED connections be removed also when virtual IP is down? Or maybe there is any sysctl option to change that behaviour?

Best regards
Arkadiusz Bubała
Open-E Poland Sp. z o.o.
www.open-e.com