Chris, Thanks for your response.
> Is that because you have an odd MTA that doesn't allow such configuration? > That is, it just assumes it should use the first interface that it finds? I'm running qmail and you are correct--it binds all outbound (qmail-send) traffic to the first iterface. There's no configuration option to change this. I wouldn't call it an odd MTA though. :) > Maybe it would be simpler to simply swap the primary and alias IP numbers > in your /etc/rc.conf file, so that the MTA starts up on the 201.61.128.211 > subnet? Yes, I'm starting to think this might be the best option. I would much rather redirect just the outbound smtp traffic to the alias IP if I could because I wouldn't have to deal with the rest of the work that will be involved with changing the machines primary IP address. I've done this before and know that it's not that involved, but when you're busy with a ton of other work quick options sometimes work best. I thought ipfilter might be able to do this. My network provider said they do it on Linux (which doesn't help me) using "ipmasqadm" with the following command: ipmasqadm portfw -a -P tcp -L primary_ip 25 -R alias_ip 25 That got me thinking that ipf/ipnat might be able to do the same thing on FreeBSD. - Jeff
