[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1331150
Title:
arp fails to update, 3.13.0-{24,29}
Status in “linux” package in Ubuntu:
Expired
Bug description:
in an AWS environment managed by BOSH, we saw tcp connectivity
problems between pairs of VMs.
VM A and VM B are up, running ubuntu 14.04-based images, and in the
same vpc subnet.
VM B is terminated, and another VM is created that uses the IP address
from VM B
The new VM tries to make a tcp connection to VM A. In some cases, the
connection fails.
Investigation reveals that VM A has the old MAC address in its
neighbor list. In some cases, running arp -d <IP Address> on VM A
"fixes the problem". Also in some cases, running arping in gratuitous
arp mode on the new VM also fixes the problem.
The problem does not occur if VM A is running an ubuntu 10.04-based
image.
The problem seems to occur only on machines with lots of tcp
connection traffic between them.
'arp -d' and arping on the new VM do not seem to "fix" the problem if
there are processes on the VMs that are trying to create new TCP
connections.
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