Hi Simon,

 There is a way, but its a hack. I dont recommend you do this, but just
shows that you dont always need to attack the problem directly..

anyway here is a simple diagram
     s0                      s1
  10.0.0.1                10.0.0.2
    ------------------ 
     |
 172.16.55.1
    (eth0)


on RTA apply the following config :

ip nat inside source static tcp 172.16.55.1 23 172.16.55.1 2002 extendable
!
interface Ethernet0
 description Dummy interface for lab testing
 ip address 172.16.55.1 255.255.255.0
 no keepalive
!
interface Serial0
 ip address 10.0.0.1 255.255.255.0
 ip nat outside
 clockrate 38400
!

So basically your mapping the local telnet port 23, to port 2002. If you try
and telnet normally to ip 172.16.55.1 you wont initiate a connection as NAT
will reply back with a port of 2002. Hence the only way to obtain telnet is
to telnet to "172.16.55.1 2002"

raj




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