pop3 port open?

[lexus]

I have the Marconi ADSL POTS router/modem and I have changed the default username and password and have deleted the Telnet users, but find that port 110 is accepting connections from the Internet as well as from my LAN.

How can I close port 110? I did not set this up in PAT and cannot find where this was done.

On connecting to Port 110 it says +OK Mini Mail POP3 Server Ready!

Thanks for your time and help in advance.

 

[mithrandi]

Are you using the router in bridged mode, and doing PPPoE through it to connect? If so, are you sure you don't have a POP3 server running on the box establishing the PPPoE session?

mithrandi

 

[lexus]

I am not running in bridged mode, and the box XP, is not running the pop3 service which is why this is so puzzling.

Telnetting to the XP box on port 110 gets refused. But the router/modem responds from any box on my LAN on 192.168.10.200 on port 110 and from the Internet on my assigned real IP.

 

[lexus]

I have just checked again and plugged a win98 box into the router/modem alone. The win98 box gets its ip address from the router/modem and has not got a pop3 server running. The modem/router is fuctioning as a router, not pppoe. It is somehow hosting a pop3 server but it is not obvious how to close off the port 110.

 

[lexus]

I must have messed up something, so I started all over again and reset the modem settings. It is now running in bridged over ethernet mode. It is now backed by a FreeBSD box natting my LAN. No ports open at all.

Thanks for your replies and assistance anyway.

 

[mithrandi]

The POP3 server story is a bit worrying; incidentally, if anyone is interested, there's a buffer overflow somewhere that causes the router to crash. I'm not sure of the exact details, but you can trigger it by running a Retina scan on the router, and activating the brute-force overflow thing (CHAM or whatever it's called); the router just stops functioning and must be reset.

mithrandi

 

[lexus]

I decided not to trust the router mode of the Marconi POTS Ethernet modem, with port 110 open for no clear reason. So I just dumbed down its functionality and it is now controlled by FreeBSD which works as a Gateway/Firewall/Router/Mail Server, etc

I see that Marconi is offering updated Firmware on their site. Rumour has it that Telkom's firmware stops the Router mode functionality.

Maybe the new Firmware fixes the buffer overflow you mentioned ?