I am having a problem telnetting into the router from the outside
when I have NAT on the router. Once I take the ip nat outside command
off the outside interface, I can telnet into the router from the
outside. I can ping the NAT router regardless of whether ip nat outside
is on the interface or not. Note that I do, of course, have the vty 0 4
passworded. Here's the config (edited for bandwidth purposes):

interface Ethernet0
 ip address 209.xxx.xxx.xxx 255.255.255.0
 ip nat outside
!
interface Serial0
 ip address 192.168.1.1 255.255.255.252
 ip nat inside
 encapsulation ppp
clockrate 2000000
!
ip nat inside source list 101 interface Ethernet0 overload
!
access-list 101 permit ip any any
ip classless
!
vty 0 4
password hrmm
login
!
end

   Packets are coming into the router from the telnetting host, and NAT
tries to do a translation on it, but fails, I think..? NOTE in the debug
output: 209.xxx.xxx.xxx is the external router ip address and
216.xxx.xxx.xxx is where I'm telnetting from. This is output from a
debug ip nat detailed and debug ip nat port combined:

04:09:59: NAT - SYSTEM PORT for 209.xxx.xxx.xxx: allocated port 0,
refcount 55, localport -1, localaddr 0.0.0.0, flags 1, syscount 55
04:09:59: NAT - SYSTEM PORT for 209.xxx.xxx.xxx: allocated port 23,
refcount 2, localport -1, localaddr 0.0.0.0, flags 1, syscount 2
04:09:59: NAT: Allocated Port for 209.xxx.xxx.xxx -> 209.xxx.xxx.xxx:
wanted 23 got 2
04:09:59: NAT: i: tcp (209.xxx.xxx.xxx, 23) -> (216.xxx.xxx.xxx, 3012)
[0]
04:09:59: NAT: TCP s=23->2, d=3012
04:09:59: NAT: o: tcp (216.xxx.xxx.xxx, 3012) -> (209.xxx.xxx.xxx, 2)
[51]
04:09:59: NAT: TCP s=3012, d=2->23
04:09:59: NAT: updated sys port: port 23, refcount 1, localport -1,
localaddr 0.0.0.0, flags 1, syscount 1
04:11:08: NAT: expiring 209.xxx.xxx.xxx (209.xxx.xxx.xxx) tcp 2 (23)

  Any ideas?

Kind Regards,
Tim Booth
MCDBA, CCNP, CCDP, CCIE written
-----------------------------------------
Those who would give up essential liberty to purchase a little temporary
safety deserve neither liberty nor safety.
Benjamin Franklin, 1759




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