Question

Cisco 877 Router config for Port Forwarding

Asked by: prema2909

Could someone please help with a beginner cisco 877 question
We have a cisco 877 configured as a ADSL gateway. The suppliers have been requested to port forward a server with the address 192.168.1.4 on 22 so that we have SSH access from the internet.

This is my first time looking at a Cisco router. The supplier configured

ip nat inside source static tcp 192.168.1.4 22 interface Dialer0 22

but the connection did not work at all

I have just tried

config t
ip access-list ext 101
permit txp any any eq 22
end

and now my external SSH client connects but the server does not respond to the correct password.
From inside the network it's fine

We don't seem to have an external connection in the router

Can anyone help with this please?
Config file is below

ADSL#show running-config
Building configuration...
 
Current configuration : 4302 bytes
!
version 12.4
no service pad
service tcp-keepalives-in
service tcp-keepalives-out
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
service sequence-numbers
!
hostname ADSL
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
clock timezone NZST 12
clock summer-time NZDT recurring 1 Sun Oct 2:00 3 Sun Mar 3:00
!
!
dot11 syslog
ip cef
!
!
no ip dhcp use vrf connected
ip dhcp excluded-address 192.168.1.1 192.168.1.150
!
ip dhcp pool DHCPPOOL1
   import all
   network 192.168.1.0 255.255.255.0
   default-router 192.168.1.2
   dns-server 202.27.184.3 202.27.184.5
   update arp
!
!
!
multilink bundle-name authenticated
!
!
file verify auto
username cisco877 privilege 15 password 0 ciscopassword
!
!
archive
 log config
  hidekeys
!
!
ip tcp timestamp
!
!
!
interface ATM0
 no ip address
 no atm ilmi-keepalive
 dsl operating-mode auto
!
interface ATM0.1 point-to-point
 pvc 0/100
  encapsulation aal5mux ppp dialer
  dialer pool-member 1
 !
!
interface FastEthernet0
!
interface FastEthernet1
!
interface FastEthernet2
!
interface FastEthernet3
!
interface Vlan1
 ip address 192.168.1.2 255.255.255.0
 ip nat inside
 ip virtual-reassembly
!
interface Dialer0
 ip address negotiated
 no ip redirects
 no ip unreachables
 ip nat outside
 ip virtual-reassembly
 encapsulation ppp
 dialer pool 1
 dialer-group 1
 no cdp enable
 ppp pap sent-username nzgbc.dsl@iconzadsl.co.nz password 0 nzgbc
 ppp ipcp dns request
 ppp ipcp route default
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 Dialer0
!
!
no ip http server
no ip http secure-server
ip dns server
no ip nat service sip tcp port 5060
no ip nat service sip udp port 5060
ip nat pool trixbox 192.168.1.150 192.168.1.150 netmask 255.255.255.0 type rotary
ip nat inside source list 1 interface Dialer0 overload
ip nat inside source static tcp 192.168.1.3 3996 interface Dialer0 3996
ip nat inside source static tcp 192.168.1.14 3389 interface Dialer0 3389
ip nat inside source static tcp 192.168.1.17 3997 interface Dialer0 3997
ip nat inside source static tcp 192.168.1.2 23 interface Dialer0 23
ip nat inside source static tcp 192.168.1.150 22 interface Dialer0 2222
ip nat inside source static udp 192.168.1.150 5060 interface Dialer0 5060
ip nat inside source static udp 192.168.1.150 4569 interface Dialer0 4569
ip nat inside source static tcp 192.168.1.150 5222 interface Dialer0 5222
ip nat inside source static tcp 192.168.1.4 80 interface Dialer0 3998
ip nat inside source static tcp 192.168.1.4 443 interface Dialer0 443
ip nat inside source static tcp 192.168.1.4 21 interface Dialer0 21
ip nat inside source static tcp 192.168.1.4 3306 interface Dialer0 3306
ip nat inside source static tcp 192.168.1.4 22 interface Dialer0 22
ip nat inside source static tcp 192.168.1.15 3389 interface Dialer0 3390
ip nat inside destination list 101 pool trixbox
!
access-list 1 remark The Lan
access-list 1 permit 192.168.1.0 0.0.0.255
access-list 101 permit udp any any range 35000 40000
access-list 101 permit tcp any any range 35000 40000
access-list 101 permit udp any any range 10000 20000
access-list 101 permit tcp any any range 10000 20000
access-list 101 permit tcp any any eq telnet
access-list 101 permit tcp any any eq 22
access-list 101 permit tcp any any eq 3398
access-list 101 permit tcp any any eq 3998
dialer-list 1 protocol ip permit
!
!
!
!

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Asked On: 2009-08-18 at 03:33:25ID24660902
Tags: Cisco 877 Networking Router
Topics: Enterprise Firewalls
,; Network Routers
,; Miscellaneous Networking
Participating Experts: 2
Points: 500
Comments: 10

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Answers

by: Zenith63Posted on 2009-08-18 at 03:58:59ID: 25121787

My Cisco is pretty limited, but jsut a couple of observations that might get you started before the gurus arrive.

Are you sure when you SSH from outside to the public IP of the Cisco it's not the Cisco itself that is replying and trying to authenticate you instead of your internal box? SSH admin on the Cisco is not explicity disabled (as HTTP admin is for instance 'no ip http server'). From external try your Cisco admin credentials and see if you get the Cisco admin prompt, you probably will. If so you can either disable SSH admin of the Cisco (not sure the exact command, but 'no ip ssh server' is likely to be it, just make sure this isn't what you're using to admin it at the moment!) or tell you internal server to listen on 222 and forward that port through so it isn't conflicting with the SSH listening on the Cisco.

Check this first and come back as I suspect it might be the problem.

by: ikalmarPosted on 2009-08-18 at 04:04:17ID: 25121813

Hi,
there is an another nat row that using SSH:
ip nat inside source static tcp 192.168.1.150 22 interface Dialer0 2222

try to disable it first!

Best Regards,
Istvan

by: prema2909Posted on 2009-08-18 at 04:06:50ID: 25121825

Hi Zenith63

Thanks very much for your response!
Just tried as suggested but it does not respond to the normal (internal) username and password, nor the server root password.
The router was responding with a timeout until I made the entry

config t
ip access-list ext 101
permit txp any any eq 22
end

It is after this entry that it started responding on 22.

I'd be very grateful for any more tips !
Kind regards
Prema

by: prema2909Posted on 2009-08-18 at 04:10:19ID: 25121843

Hi Istvan!
Complete beginner here but from the supplier's comment it appears that this is IP access for the VOIP box (TrixBox) and the 2222 is the external access port- Apparently it is possible to have more than one port 22 internally as long as the external ports are different.
Any comments welcome -- thanks very much for your response
Kind regards
Prema

by: Zenith63Posted on 2009-08-18 at 04:16:02ID: 25121878

I could be wrong ikalmar, but the first rule forwards port 2222 to one internal server while the second forwards port 22 to a different internal server. On the internal side both servers are listening on port 22, but this should work fine as it is what NAT is meant to do.

ip nat inside source static tcp 192.168.1.150 22 interface Dialer0 2222

External:2222 -> 192.168.1.150:22

ip nat inside source static tcp 192.168.1.4 22 interface Dialer0 22

External:22 -> 192.168.1.4:22

prema2909 - Your access-list entry is just a firewall rule allowing from ANY to ANY with SSH protocol. So if the Cisco router itself is listening for SSH traffic (ie. for people to log on to it and admin it using SSH instead of telnet) which is the default setup I think, then by adding your access list you've basically opened up WAN administration of your Cisco using SSH. So when SSH traffic comes to the public IP, instead of the Cisco forwarding it on to the internal box it thinks the traffic is meant for it for administration, so doesn't forward it. You can confirm this easily enough by trying your Cisco admin/enable password at the prompt and see if it lets you in, or change the internal server to listen on 222 and forward that through. This is probably the exact reason there is a rule there already forwarding port 2222 through, somebody in the past needed to SSH through to an internal box but couldn't use port 22 because the Cisco router itself already uses this.

by: ikalmarPosted on 2009-08-18 at 04:19:32ID: 25121904

sorry that I said wrong....

by: Zenith63Posted on 2009-08-18 at 04:43:21ID: 25122042

prema - I'm heading out now so won't be able to reply until tomorrow but I would suggest you try either disabling SSH on the Cisco (assuming you are using telnet to admin it!) with

no ip ssh server

Or another thought that just came to mind is that you don't need to change the internal server to a different port, just change the external port number. So remove your ip nat rule -

no ip nat inside source static tcp 192.168.1.4 22 interface Dialer0 22

Then add one back that says

ip nat inside source static tcp 192.168.1.4 22 interface Dialer0 222

Remove your access-list entry

no access-list 101 permit tcp any any eq 22

Then add one back in like

access-list 101 permit tcp any any eq 222

Then from outside try and ssh to the public IP on port 222 instead of 22, that should get you to your internal server! Final config on Cisco should be like -

version 12.4
no service pad
service tcp-keepalives-in
service tcp-keepalives-out
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
service sequence-numbers
!
hostname ADSL
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
clock timezone NZST 12
clock summer-time NZDT recurring 1 Sun Oct 2:00 3 Sun Mar 3:00
!
!
dot11 syslog
ip cef
!
!
no ip dhcp use vrf connected
ip dhcp excluded-address 192.168.1.1 192.168.1.150
!
ip dhcp pool DHCPPOOL1
   import all
   network 192.168.1.0 255.255.255.0
   default-router 192.168.1.2
   dns-server 202.27.184.3 202.27.184.5
   update arp
!
!
!
multilink bundle-name authenticated
!
!
file verify auto
username cisco877 privilege 15 password 0 ciscopassword
!
!
archive
 log config
  hidekeys
!
!
ip tcp timestamp
!
!
!
interface ATM0
 no ip address
 no atm ilmi-keepalive
 dsl operating-mode auto
!
interface ATM0.1 point-to-point
 pvc 0/100
  encapsulation aal5mux ppp dialer
  dialer pool-member 1
 !
!
interface FastEthernet0
!
interface FastEthernet1
!
interface FastEthernet2
!
interface FastEthernet3
!
interface Vlan1
 ip address 192.168.1.2 255.255.255.0
 ip nat inside
 ip virtual-reassembly
!
interface Dialer0
 ip address negotiated
 no ip redirects
 no ip unreachables
 ip nat outside
 ip virtual-reassembly
 encapsulation ppp
 dialer pool 1
 dialer-group 1
 no cdp enable
 ppp pap sent-username nzgbc.dsl@iconzadsl.co.nz password 0 nzgbc
 ppp ipcp dns request
 ppp ipcp route default
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 Dialer0
!
!
no ip http server
no ip http secure-server
ip dns server
no ip nat service sip tcp port 5060
no ip nat service sip udp port 5060
ip nat pool trixbox 192.168.1.150 192.168.1.150 netmask 255.255.255.0 type rotary
ip nat inside source list 1 interface Dialer0 overload
ip nat inside source static tcp 192.168.1.3 3996 interface Dialer0 3996
ip nat inside source static tcp 192.168.1.14 3389 interface Dialer0 3389
ip nat inside source static tcp 192.168.1.17 3997 interface Dialer0 3997
ip nat inside source static tcp 192.168.1.2 23 interface Dialer0 23
ip nat inside source static tcp 192.168.1.150 22 interface Dialer0 2222
ip nat inside source static udp 192.168.1.150 5060 interface Dialer0 5060
ip nat inside source static udp 192.168.1.150 4569 interface Dialer0 4569
ip nat inside source static tcp 192.168.1.150 5222 interface Dialer0 5222
ip nat inside source static tcp 192.168.1.4 80 interface Dialer0 3998
ip nat inside source static tcp 192.168.1.4 443 interface Dialer0 443
ip nat inside source static tcp 192.168.1.4 21 interface Dialer0 21
ip nat inside source static tcp 192.168.1.4 3306 interface Dialer0 3306
ip nat inside source static tcp 192.168.1.4 22 interface Dialer0 222
ip nat inside source static tcp 192.168.1.15 3389 interface Dialer0 3390
ip nat inside destination list 101 pool trixbox
!
access-list 1 remark The Lan
access-list 1 permit 192.168.1.0 0.0.0.255
access-list 101 permit udp any any range 35000 40000
access-list 101 permit tcp any any range 35000 40000
access-list 101 permit udp any any range 10000 20000
access-list 101 permit tcp any any range 10000 20000
access-list 101 permit tcp any any eq telnet
access-list 101 permit tcp any any eq 222
access-list 101 permit tcp any any eq 3398
access-list 101 permit tcp any any eq 3998
dialer-list 1 protocol ip permit

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by: prema2909Posted on 2009-08-18 at 05:14:42ID: 25122337

Hi Zenith63!
Have tried the config as suggested and for some reason we're still not getting to it!
Will read through the config and your advice carefully -- this seems a bit tricky. Will also check my local firewall in case it is blocking my non standard SSH port
Any comments welcome

Thanks indeed Ikalmar -- we're grateful to have your thoughts
Kind regards
Prema


ADSL#sh running-config
Building configuration...
 
Current configuration : 3961 bytes
!
version 12.4
no service pad
service tcp-keepalives-in
service tcp-keepalives-out
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
service sequence-numbers
!
hostname ADSL
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
clock timezone NZST 12
clock summer-time NZDT recurring 1 Sun Oct 2:00 3 Sun Mar 3:00
!
!
dot11 syslog
ip cef
!
!
no ip dhcp use vrf connected
ip dhcp excluded-address 192.168.1.1 192.168.1.150
!
ip dhcp pool DHCPPOOL1
   import all
   network 192.168.1.0 255.255.255.0
   default-router 192.168.1.2
   dns-server 202.27.184.3 202.27.184.5
   update arp
!
!
!
multilink bundle-name authenticated
!
!
file verify auto
username cisco877 privilege 15 password 0 ciscopassword
!
!
archive
 log config
  hidekeys
!
!
ip tcp timestamp
!
!
!
interface ATM0
 no ip address
 no atm ilmi-keepalive
 dsl operating-mode auto
!
interface ATM0.1 point-to-point
 pvc 0/100
  encapsulation aal5mux ppp dialer
  dialer pool-member 1
 !
!
interface FastEthernet0
!
interface FastEthernet1
!
interface FastEthernet2
!
interface FastEthernet3
!
interface Vlan1
 ip address 192.168.1.2 255.255.255.0
 ip nat inside
 ip virtual-reassembly
!
interface Dialer0
 ip address negotiated
 no ip redirects
 no ip unreachables
 ip nat outside
 ip virtual-reassembly
 encapsulation ppp
 dialer pool 1
 dialer-group 1
 no cdp enable
 ppp pap sent-username nzgbc.dsl@iconzadsl.co.nz password 0 nzgbc
 ppp ipcp dns request
 ppp ipcp route default
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 Dialer0
!
!
no ip http server
no ip http secure-server
ip dns server
no ip nat service sip tcp port 5060
no ip nat service sip udp port 5060
ip nat pool trixbox 192.168.1.150 192.168.1.150 netmask 255.255.255.0 type rotary
ip nat inside source list 1 interface Dialer0 overload
ip nat inside source static tcp 192.168.1.3 3996 interface Dialer0 3996
ip nat inside source static tcp 192.168.1.14 3389 interface Dialer0 3389
ip nat inside source static tcp 192.168.1.17 3997 interface Dialer0 3997
ip nat inside source static tcp 192.168.1.2 23 interface Dialer0 23
ip nat inside source static tcp 192.168.1.150 22 interface Dialer0 2222
ip nat inside source static udp 192.168.1.150 5060 interface Dialer0 5060
ip nat inside source static udp 192.168.1.150 4569 interface Dialer0 4569
ip nat inside source static tcp 192.168.1.150 5222 interface Dialer0 5222
ip nat inside source static tcp 192.168.1.4 80 interface Dialer0 3998
ip nat inside source static tcp 192.168.1.4 443 interface Dialer0 443
ip nat inside source static tcp 192.168.1.4 21 interface Dialer0 21
ip nat inside source static tcp 192.168.1.4 3306 interface Dialer0 3306
ip nat inside source static tcp 192.168.1.4 22 interface Dialer0 222
ip nat inside source static tcp 192.168.1.15 3389 interface Dialer0 3390
ip nat inside destination list 101 pool trixbox
!
access-list 1 remark The Lan
access-list 1 permit 192.168.1.0 0.0.0.255
access-list 101 permit tcp any any eq 222
dialer-list 1 protocol ip permit
!
!

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by: prema2909Posted on 2009-08-25 at 05:39:08ID: 31616975

Appreciate the help and the effort Thanks all !

by: prema2909Posted on 2009-08-25 at 05:41:31ID: 25176868

Just letting you know that the solution was to shift the ports up to 20000+ By doing that everything magically came right
Thanks for the comments that helped steer us in the right direction

20120131-EE-VQP-002

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Cisco 877 Router config for Port Forwarding

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