On Sun, 9 Jun 2002, Cory Daehn wrote:
> So 16 is the bits? Should my Class C entries be /8 or /256?
Its the bits of the network, not the hosts.
So what you think of as a "Class C" is really a /24
Classed addresses are obsolete. Again, google for "CIDR"
This diagram might be helpful:
8 16 24 32
| | | |
255.255.255.255
If you had 10.0.0.0/8, thats 10.0.0.0 thru 10.255.255.255
If you had 10.0.0.0/24, thats 10.0.0.0 thru 10.0.0.255
But with CIDR, you dont have to just break on 8, 16, and 24.
You could also have, 10.0.0.0/9, which would be 10.0.0.0 thru
10.127.255.255
Or 10.0.0.0/12, 10.0.0.0 thru 10.240.255.255
Or 10.0.0.0/23, 10.0.0.0 thru 10.0.0.1.255.
>
> -----Original Message-----
> From: exim-users-admin@??? [mailto:exim-users-admin@exim.org] On
> Behalf Of Patrick Boutilier
> Sent: Sunday, June 09, 2002 6:19 PM
> To: exim-users
> Subject: Re: [Exim] Mail relay problems
>
>
> 64.217.0.0/16
>
>
> Cory Daehn wrote:
> > On another note... How do I get exim to relay for an entire class B
> > domain? I have a client that uses SBC's DSL and they keep having
> > their IP change from one class C to another, but within the same class
>
> > C. According to ARIN the entire class B block belongs to SBC
> > Communications, and I'd like to just enable it from there. Same thing
>
> > for University of Texas' dialup account IP's.
> >
> > I tried this:
> >
> > 64.217.0.0/65536
> >
> > but it doesn't seem to be working... Any suggestions?
> >
> >
>
>
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