Re: Changing ports used by TCP/IP servers

[Vernon Hamberg <vhamberg@xxxxxxxxx>]

The LinkSys only _forwards_ datagrams, it does not translate the port.. So
a datagram addressed to the LinkSys using a certain port will send it to
the inside, but the address it goes to must use that port. This is why we
probably want something with more features, eventually - probably someone
will say 'soonest'  <g>  but I can't do much more right now - have code to
write.

The router is set to block WAN probes, but forwarding goes around that, I
assume. So I'd better have good security on the boxes themselves, as they
would still be exposed, as you say, on the not 'well-know' ports I want to use.

At 08:25 PM 7/26/02 -0400, you wrote:

>Vern,
>
>You can probably just configure the LinkSys to forward from the
>non-standard port to the standard port.  In other words, block ports 21 and
>23 at the LinkSys and have it forward 10021 and 10023 to the FTP and Telnet
>ports.
>
>I am pretty sure, however, that the port scanners that hackers use are
>smart enough to find these openings.
>
>Mark