Binding to non-local interfaces

Paul Vixie vixie at
Fri Oct 22 14:54:51 UTC 2010

in bsd vrrp, the service address is always present as an
interface alias, and vrrp is just a way to synchronize with
the other server and/or the exit gateway, so this problem
does not occur.  in other words other processes on the
backup server always use the backup server to reach the
shared resource.  if on linux it's possible to bind() to
an address that's not nec'ily present, then your suggestion
for listen-on-always (or more likely listen-on-also) makes
fine sense.

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