>If I go to another machine and telnet to GatewayAddress port 25, it just
>sits there
>until it times out. The machine I telnet from will show "SYN sent" to
>GatewayAddress:smtp
>in netstat. The logs in the gateway don't show any connection to port 25,
>nor does netstat.
>It does this no matter what machine I use as the ServerAddress or what
>machine I telnet from.
OK... where's the machine that your telnetting from? Is it on your local
network? If it is, you won't be able to telnet into the server,
>ipmasqadm portfw -a -P tcp -L GatewayAddress 25 -R ServerAddress 25
This command will only apply to connections that are coming from the
subnet that is connected to GatewayAddress, not the subnet that
ServerAddress is on. So you need an external linux box (or something) to
test it out...
Internally, to get around this problem when I have client programs
checking mail, i've actually added a host to the TCP stack of the
clients, so that all connections to my static hostname, instead go to my
internal mail server, so that they can send and receive mail no problem.
You can do it with IP's, yes, however, some mail clients output the
actual "pop account" in the email headers, and then external mail servers
will bounce them because the can't route to 192.168.0.5 or whatever =)
Cheers,
Liam
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