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Limiting Telnet capabilities

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by roy_fenn

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We have 3rd parties who access our unix servers via telnet for application maintenance and for diagnostics. How do we prevent them logging onto other servers in our network?

6 replies

by timthetoolman

Hi,

Setting appropriate usernames and passwords is the first step...

You're going to need to give us more information regarding your network - like does it have a firewall? Are the connections through dial-up?

There are certainly methods for specifying what machines certain ports are open to at the firewall, but do you even have one?

Cheers,
Tim.

by roy_fenn

It is dial-up and we have a firewall so we'll only allow telnet from their IP address to our server IP address.

by mike mullins

Three ways I can think of is
1. Remove or rename telnet on the Unix server.
2. Apply an access list to a router or smart switch between the Unix server and the rest of your network.
3. Add an entry into the HOST file on the Unix server that directs port 23 back to the unix server.

1 & 3 will slow them down, 2 will stop them unless they have access to your routers.

Good Luck
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