Author: Sam Bashton Date: To: exim-users Subject: Re: [Exim] restricting a router to specific sender_host_address
On Thu, Feb 05, 2004 at 09:59:22PM +0530, Suresh Ramasubramanian wrote: > Philip Chambers [2/5/2004 8:41 PM] :
>
> >I already have:
> >
> > hostlist local_ip = 144.173.0.0/16 : 172.16.0.0/16 : 127.0.0.1
>
> Uh, just one thing.
>
> 144.173.0.0/16 is exeter.ac.uk - but RFC1918 IPs in there are just
> 172.16.0.0/12, that is, 172.(16--31).xxx.xxx. The rest of that /16 is
> a lot of other things, including AOL dialups.
I think you're confusing /16 with /8 - AOL has 172.128.0.0/10, which doesn't
overlap 172.16.0.0/16.
You are absolutely correct in your assertion that the RFC1918 range is
172.16.0.0/12 rather than /16, but using /16 won't result in unnecessary
relaying, in fact quite the opposite.
