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When mail is sent from my server, Qmail uses an incorrect IP for the connection. How do I change the IP used for outgoing connections from my server?

APPLIES TO:
  • Parallels Plesk for Linux/Unix

Resolution

The default IP for outgoing connections can be set using the "ip" utility. First, check how routing is configured on the server:

# /sbin/ip route
192.168.50.0/24 dev eth1 proto kernel scope link src 192.168.50.53
169.254.0.0/16 dev eth1 scope link
default via 192.168.50.254 dev eth1


If no "src" is listed in the "ip" output for the default route, the main IP on the interface is used for outgoing connections. You can change it using the following command:

# /sbin/ip route change default via 192.168.50.254 dev eth1 src 192.168.50.100

Now:

/sbin/ip route
192.168.50.0/24 dev eth1 proto kernel scope link src 192.168.50.53
169.254.0.0/16 dev eth1 scope link
default via 192.168.50.254 dev eth1 src 192.168.50.100


Note: Be careful. If you set the wrong IP as the source, you will lose the link to the server.

Additional Information

To preserve this result after reboot on SLES10, you must insert the following lines into the /etc/sysconfig/network/if-up.d/staticroute file:

/sbin/ip route change default via 192.168.50.254 dev eth1 src 192.168.50.100
/sbin/ip route change 192.168.50.0/24 dev eth1 src 192.168.50.100



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