bpneiman
join:2001-11-27
West Point, NE
| Closing Telnet Port Actiontec GT704
We still use a GT704 for our DSL modem. We do have other firewalls between it and our network, and have changed to admin user and created a strong password. I would like to completely close the port, or at least forward it to "outer space" if possible.
I have the latest firmware, and have tried adjusting the firewall rules, but there is not much fine grained control there. If I make them too restrictive it does not work for the services we are running on the firewalls behind it.
Any suggestions? |
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Tehrasha
join:2004-12-15
Vinton, IA | I believe that if remote-access is turned off, that should block access to the modem from the outside world. |
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bpneiman
join:2001-11-27
West Point, NE | Remote Access is turned off. Not saying it can be accessed remotely from the outside world, but port scans show telnet port as open. I would like to eliminate that. |
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Tehrasha
join:2004-12-15
Vinton, IA
edit:
July 11th, @11:24PM
| The port may be 'open' (ie: listening) but it is rejecting everything from the outside world. The service needs to remain open so you can get into it locally.
Currently there is a door they can knock on, but its locked from the inside, and there is no keyhole on the outside. 
You can telnet into the modem and insert an iptable rule to DROP any UDP or TCP packets on port 23. But the moment you enter the rule, you will cut your connection to the modem with it.
This might actually be what you want, but it will have to be redone anytime your modem is reset or power cycled. |
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