In the default Postfix main.cf for Debian Lenny, the mynetworks line looks like this:
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 This is what I understand: * The 127.0.0.0/8. It is classic CIDR IPv4 notation, which I am comfortable with. * The rest is CIDR IPv6 notation. * The :: is a group of zeros in an IPv6 address. * The ::1/128 is the IPv6 loopback (thank you Wikipedia). * IPv6 addresses need to be in brackets because the ":" is reserved for other config syntax (a common convention--not just Postfix, and not just because of the port identifier). My question is: * Why include ::ffff:127.0.0.0/104? I thought about asking on #utah, but I want this in the plug archives. Then next time I ask this question, Google might help. Thanks, Richard /* PLUG: http://plug.org, #utah on irc.freenode.net Unsubscribe: http://plug.org/mailman/options/plug Don't fear the penguin. */
