On Fri, 4 Feb 2011, Prabhu Hariharan wrote:
When I delete an IP-address from an interface, the TCP (and other)
connections using that local IP-address are not getting purged. The telnet
or ssh sessions on the other end just get hung, as FreeBSD address-deletion
doesn't handle this situation and fails to call pfctlinput() to notify
protocols on this event. The TCP connections simply linger in the system
and takes it due course on TCP timers to free those inpcbs.
tcp4 0 0 30.30.30.31.22 30.30.30.30.58796 ESTABLISHED
Is this by design? Or any significance on relying on applications
intelligently to do timeouts, without a notification from network layer?
I don't know if it's by design per se, but it proves extremely handy in
practice when 802.11 blips and DHCP goes funny. Or, perhaps more
historically, when PPP was restarted, leading to addresses being removed and
re-added.
Robert
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