Philip Prindeville:
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> > And unless you turn off IP forwarding in the TCP/IP stack, the value
> > of {if_addr} and {if_name} says nothing about the path that packets
> > have taken. It just says something about the destination IP address.
> In a richly connected network with a multihomed host, packets might
> arrive on more than one interface during the course of a connection
> anyway, possibly even simultaneously.
Indeed. That's why {if_name} is totally meaningless in such
configurations, and {if_addr} mostly meaningless.
So, you can save yourself time and skip these features unless you
intend to run Postfix on a multi-homed firewall, which case I would
recommend running Postfix on single-homed hosts on both sides of a
"bare" firewall (the configuration of classical DEC SEAL firewall).
Wietse
