how to use IF aliases for outgoing packets?

[alware]

I do have physical inteface if0
which is carrying several IPs

ifconfig_if0="inet xxx.xxx.xxx.xxx"
ifconfig_if0_alias0="inet yyy.yyy.yyy.yyy"
ifconfig_if0_alias1="inet zzz.zzz.zzz.zzz"

how can I manage the outgoing traffic to flow from different ips?

e.g. rinetd uses yyy.yyy.yyy.yyy
and postfix knocks out via zzz.zzz.zzz.zzz

now all goes through the first xxx

 

[pbd]

You cau use NAT in pf(). For example to map all outgoing traffic on port 25 to zzz.zzz.zzz.zzz:

nat on if0 proto tcp port = 25 -> zzz.zzz.zzz.zzz

 

[pbd]

See [post]37707[/post].

 

[alware]

pbd thanx

but can I use for that ipfw/natd?

 

[DutchDaemon]

NAT is NAT in any packet filter. Note that ipfw now incorporates NAT (in-kernel), so you don't need a separate instance of natd anymore.

See the NETWORK ADDRESS TRANSLATION chapter in ipfw(8).

 

[alware]

thanx
DutchDaemon

 

[alware]

Unfortunately there's no solution for the aforecited problem using NAT.

 

[dinoex@]

Normaly you have to tell each application which IP they should bind to.

a few examples:

ping -S yyy.yyy.yyy.yyy www.example.com

traceroute -s yyy.yyy.yyy.yyy www.example.com

ssh -b yyy.yyy.yyy.yyy www.example.com