On 09/20/2015 08:40 PM, John Massai wrote: > I have a Postfix instance that listens on one of many > interfaces/addresses available on a machine. > > There is one special smptd service in master.cf that I'd like to have > listen on several addresses (but not all, so I can't use "all"). > > I have found that I can define the service once for every address and > it works great, but am not having luck trying to combine them into one > by specifying inet_interfaces (possibly because it conflicts with the > service definition itself? > > I.e., > > main.cf > inet_interfaces = a.b.c.d > > master.cf > 20025 inet n - n - - smtpd > -o inet_interfaces=a.b.c.d,e.f.g.h,i.j.k.l > > The service only binds to the address from main.cf, a.b.c.d in this > example. Is it possible (without defining the service many times over) > to have it bind to more than one interface?
It is with a particular trick using /etc/hosts, but I don't know how well it's supported, it may only work in Linux: In master.cf: foo:20025 inet n - n - - smtpd In /etc/host.conf: multi on In /etc/hosts: 192.168.1.1 foo 192.168.1.2 foo ... etc Postfix should then bind the above service to every IP listed for foo in /etc/hosts on the 20025 port. You may be simply swapping multiple service definitions in master.cf for multiple lines in /etc/hosts, but if you already have lines in /etc/hosts for those IPs then you simply need to add "foo" as an alias to each one you want. In theory this should work for any result returned by the resolver, so if you run local dns you could that instead, or anything else you can set on the hosts: line in /etc/nsswitch.conf. Peter
