CentOS - Oct 2006 - Help with sendmail ( or Iptables ... or DNS)

Hi, i have a CentOS 4.4 running sendmail, with two network interfaces
(eth0 -> Internet , and eth1 Local Network), from the terminal (SSH) i
do

telnet 127.0.0.1 25

and it connects to sendmail (i think so), but

from another server (external, and so from the same SSH terminal) i
try to connect to the Internet IP

telnet 146.77.220.236 25
Trying 146.77.220.236...
telnet: connect to address 164.77.228.236: Connection refused
telnet: Unable to connect to remote host: Connection refused

so i was thinking "it could be the fu...ing IPTABLES"

from terminal execute

iptables -L| grep smtp

and the result is:

ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:smtp

so , if the sendmail service is up, what could be happen??

Departamento de Informatica wrote:
> so , if the sendmail service is up, what could be happen??
Default sendmail installs only listen on 127.0.0.1:25. See sendmail.mc.

Ralph
-- 
Ralph Angenendt......ra at br-online.de | .."Text processing has made it
possible
Bayerischer Rundfunk...80300 M?nchen | ....to right-justify any idea, even one
Programmbereich.Bayern 3, Jugend und | .which cannot be justified on any other
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On Fri, 6 Oct 2006, Departamento de Informatica wrote:
> Hi, i have a CentOS 4.4 running sendmail, with two network interfaces
> (eth0 -> Internet , and eth1 Local Network), from the terminal (SSH) i
> do
>
> telnet 127.0.0.1 25
>
> and it connects to sendmail (i think so), but
>
> from another server (external, and so from the same SSH terminal) i
> try to connect to the Internet IP
>
> telnet 146.77.220.236 25
> Trying 146.77.220.236...
> telnet: connect to address 164.77.228.236: Connection refused
> telnet: Unable to connect to remote host: Connection refused
>
> so i was thinking "it could be the fu...ing IPTABLES"
>
> from terminal execute
>
> iptables -L| grep smtp
>
> and the result is:
>
> ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:smtp
>
> so , if the sendmail service is up, what could be happen??
sendmail by default - for security - doesnt listen on the external 
interface.

You need to modify /etc/mail/sendmail.mc to say :-

DAEMON_OPTIONS(`Port=smtp, Address=146.77.220.236, Name=MTA')dnl

as well as the line that says 127.0.0.1 (if you want it listening on 
localhost)

Then run 'make' in the /etc/mail directory and restart sendmail.

Regards
Lance




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