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SMTP is filtered?
This is a discussion on SMTP is filtered? within the Ubuntu / Debian forums, part of the Linux Distribution category; Hello all, I have setup an email server on my machine which when I try to telnet Code: telnet localhost ...
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10-29-2008, 03:25 PM
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SMTP is filtered?
Hello all,
I have setup an email server on my machine which when I try to telnet Code:
telnet localhost 25 I have a BCM96338 ADSL Router on which I have created a NAT to allow traffic on port 25 to my machine. But when I try to telnet on port 25 it tries to connect and then times out. When did a nmap it showed that the SMTP was filtered. Any suggestions on how can I enable SMTP on my router? Thanks. 
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10-31-2008, 12:19 AM
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You need to adjust firewall rules for both router and Linux system.
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Vivek Gite Linux Evangelist  Be proud RHEL user, and let the world know about your enterprise choices! Join RedHat user group. Always use CODE tags for posting system output and commands! Do you run a Linux? Let's face it, you need help
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10-31-2008, 03:13 AM
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I have created iptable rules on the router to accept the traffic on prot 25 and forward it to the linux machine.
There is an iptable rule on the linux machine to accept traffic on port 25. IPTable Rule on Router: Code:
iptables -t filter -A FORWARD -p tcp --dport smtp -j ACCEPT -d xxx.xxx.xxx.xxx iptables -t nat -A PREROUTING -p tcp --dport smtp -j DNAT --to-destination xxx.xxx.xxx.xxx Code:
iptables -t filter -A INPUT -p tcp --dport smtp -j ACCEPT -d xxx.xxx.xxx.xxx Please let me know if there is anything that needs to be modified. Thanks 
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