Re: [FW-1] MAIL and LINUX

[Claes Jansson <claes.jansson@FW1-NOSPAMNYKOPING.SE>]

Hi,

on linux you don't need the local.arp file. If you use Static-NAT you can
enable proxy_arp on the external interface by putting this line in your
/etc/rc.d/rc.local. And this is if your external interface is 'eth0'.

echo "1" >/proc/sys/net/ipv4/conf/eth0/proxy_arp

then if you use the local firewall sendmail as an SMTP-relay you need to
activate sendmail on the network-interfaces (by default it is only active
on loopback interface). This setting you will find in /etc/mail/sendmail.mc.

best regards

        //Claes Jansson

At 09:20 2001-11-14 -0500, you wrote:
> Hello,
>
> I sent an email earlier regarding a mail problem with the firewall.  I
> recently setup a RH 70 machine with 4.1 sp3.  Everything is working fine
> except for mail.  We have one static NAT rule for our SMTP server
> (exchange).  I added the arps and Static Route to the rc.local file and
> they seem to work great, also added the local.arp file to STATE dir.
> The old firewall that was setup was an NT 4 box that passes mail fine.
> The moment I cut over to the linux server, no mail gets sent out or
> received.  I do see accepts in our log viewer from our mail server to
> random IP's, but no mail is leaving and no mail is returning.  From an
> outside line, I can telnet to the static address on port 25 and I reach
> the mail server.  WHAT AM I MISSING?
>
> any help would be appreciated.
>
> Thanks,
>
> Aeon
>
> PS.  I used automatic STATIC nat rules and i've checked them a couple
> times.
>
> The Dalai Lama says, "Those things which will work out, there is no use
> worrying about;
>  Those things which won't work out, worrying won't help."
>
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