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Community Member

Nat / Pat & Telnet

Can anyone tell me why I cannot get from the outside pointing at the outside address ( the dialer ) port 86, to port 23 on the inside,

The dialer is assigned a static address on connect. I can telnet into port 23 @ from inside the router.



Cisco Internetwork Operating System Software

IOS (tm) C800 Software (C800-Y6-MW), Version 12.0(5)T, RELEASE SOFTWARE (fc1)

Copyright (c) 1986-1999 by cisco Systems, Inc.

Compiled Fri 23-Jul-99 01:30 by kpma

Image text-base: 0x000E9000, data-base: 0x00595000

ROM: TinyROM version 1.2(2)

Router uptime is 50 minutes

System returned to ROM by power-on

System image file is "flash:c800-y6-mw.120-5.T"

Cisco C802 (MPC850) processor (revision 1) with 43112K bytes of virtual memory.

Processor board ID JAD03500EH2

CPU part number 33

Bridging software.

Basic Rate ISDN software, Version 1.1.

1 Ethernet/IEEE 802.3 interface(s)

1 ISDN Basic Rate interface(s)

4M bytes of physical memory (DRAM)

8K bytes of non-volatile configuration memory

8M bytes of flash on board (4M from flash card)


Router#show config

Using 1693 out of 8062 bytes


version 12.0

no service pad

service timestamps debug uptime

service timestamps log uptime

service password-encryption


hostname Router


enable secret 5 xxxxxxxxxxxxxx


username xxxxxxxxx password 7 xxxxxxxxxxxxxx





ip subnet-zero

no ip source-route

ip dhcp excluded-address


ip dhcp pool bvd



dns-server xxxxxxxxx


lease 10


isdn switch-type basic-ni



process-max-time 200


interface Ethernet0

ip address

no ip directed-broadcast

no ip proxy-arp

ip nat inside


interface BRI0

no ip address

no ip directed-broadcast

encapsulation ppp

dialer pool-member 1

isdn switch-type basic-ni

isdn spid1 xxxxxxxxxxx

isdn spid2 xxxxxxxxxx


interface Dialer1

description ISP

ip address negotiated

no ip directed-broadcast

no ip proxy-arp

ip nat outside

encapsulation ppp

no ip split-horizon

dialer remote-name Cisco1

dialer idle-timeout 180

dialer string xxxxxxx class DialClass

dialer hold-queue 10

dialer load-threshold 225 either

dialer pool 1

dialer-group 1

ppp pap sent-username xxxxxxx password 7 xxxxxxxxxxx

ppp multilink


ip nat inside source list 101 interface Dialer1 overload

ip nat inside source static tcp 23 interface Dialer1 86

no ip http server

ip classless

ip route Dialer1



map-class dialer DialClass

access-list 18 permit

dialer-list 1 protocol ip permit


line con 0

exec-timeout 120 0

transport input none

stopbits 1

line vty 0 4

exec-timeout 0 0

login local



Community Member

Re: Nat / Pat & Telnet

You specified:

ip nat inside source list 101 interface Dialer1 overload


access-list 18 permit

The effect of this combination is to deny everything, effectively diabling NAT

try changing the "101" to "18" in the first statement

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