Re: [exim4] mixed up about terminology
On Sun, Oct 05, 2014 at 09:12:19PM +0100, Brian wrote:
> On Sun 05 Oct 2014 at 14:24:47 -0400, Harry Putnam wrote:
>
> > Simon Hollenbach <ionpowered@gmail.com> writes:
> >
> > > You should leave the relay-list empty unless you really know what you
> > > are doing. Mail to remote hosts should generally only be processed for
> > > users that have authenticated to your SMTP-server.
> >
> > I don't have much of a clue of what I'm doing... but I should have
> > mentioned earlier that my setup is a single user setup on a home lan.
> >
> > It gets a little confusing to me because the server itself needs to
> > send out to my IP smart host, while at the same time it will serve s
> > the smart host for my other lan machines.
>
> The term "smarthost" is simply another name for a mail server. A mail
> server designated as a "smarthost" does nothing more or nothing less
> than any other mail server. All mail across and between networks is
> transported using mail servers.
>
> > I do want to be able to use this server as the smart host for my other
> > lan machines. So is that second one (about relaying) the place to
> > list my lan networks?
>
> It is the correct place. An example of what to put there is given in
> another post in this thread. I have 192.168.7.0/24. I don't know whether
> /24 is as good as /23.
It's tighter. /24 is most likely correct (describes a network starting from
192.168.7.0 and ending at 192.168.7.255). The "ipcalc" tool is very helpful for
working out netmasks:
> $ ipcalc 192.168.7.0/24
> Address: 192.168.7.0 11000000.10101000.00000111. 00000000
> Netmask: 255.255.255.0 = 24 11111111.11111111.11111111. 00000000
> Wildcard: 0.0.0.255 00000000.00000000.00000000. 11111111
> =>
> Network: 192.168.7.0/24 11000000.10101000.00000111. 00000000
> HostMin: 192.168.7.1 11000000.10101000.00000111. 00000001
> HostMax: 192.168.7.254 11000000.10101000.00000111. 11111110
> Broadcast: 192.168.7.255 11000000.10101000.00000111. 11111111
> Hosts/Net: 254 Class C, Private Internet
versus
> $ ipcalc 192.168.7.0/23
> Address: 192.168.7.0 11000000.10101000.0000011 1.00000000
> Netmask: 255.255.254.0 = 23 11111111.11111111.1111111 0.00000000
> Wildcard: 0.0.1.255 00000000.00000000.0000000 1.11111111
> =>
> Network: 192.168.6.0/23 11000000.10101000.0000011 0.00000000
> HostMin: 192.168.6.1 11000000.10101000.0000011 0.00000001
> HostMax: 192.168.7.254 11000000.10101000.0000011 1.11111110
> Broadcast: 192.168.7.255 11000000.10101000.0000011 1.11111111
> Hosts/Net: 510 Class C, Private Internet
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