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"Steven M. Bellovin" <smb@cs.columbia.edu> writes:

> I have a similar need.  In particular, I have an EVDO wireless card
> which is less happy -- i.e., it often drops the call -- if it sees an
> outbound packet with an invalid source address.=20=20
>
> What I'd really like is an ifconfig or sysctl option preventing a
> packet from leaving an interface if the source address doesn't match.
> Since that doesn't exist, my ppp-up and ppp-down scripts manipulate my
> pf or ipf filters to do the same thing.

But what you want really is mostly a firewall feature.  I can see an
ifconfig flag to say 'only pass packets matching my src addr', though.
That would make things easier.

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