Wan access

[niiodaie76]

Hello Im trying to route traffic from my cisco 3550 router to the internet through my ISP provided router.

i have configure DHCP on the 3550 router interface going to the ISP router- and can see it receiving and IP from an IP on the configuration page. I am howver not able to ping any host on the network from the router and unable to route to the internet. i have pasted my configuration here for any inputs

Thanks

Router#
Router#show run
Building configuration...

Current configuration : 1702 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Router
!
boot-start-marker
boot-end-marker
!
logging message-counter syslog
!
no aaa new-model
dot11 syslog
ip source-route
!
!
ip dhcp excluded-address 172.16.1.1 172.16.1.32
!
ip dhcp pool insideDCHP
!
ip dhcp pool insideDHCP
   network 172.16.0.0 255.255.0.0
   default-router 172.16.1.1
   dns-server 68.94.156.1 68.94.157.1
!
!
ip cef
no ipv6 cef
!
multilink bundle-name authenticated
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
voice-card 0
!
!
!
!
!
archive
log config
  hidekeys
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
description Facing ISP (WAN)
ip address dhcp
ip nat outside
ip virtual-reassembly
duplex auto
speed auto
!
interface Service-Engine0/0
no ip address
shutdown
!
interface FastEthernet0/1
description Facing LAN
ip address 172.16.1.1 255.255.255.0
ip nat inside
ip virtual-reassembly
duplex auto
speed auto
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
ip nat inside source list 1 interface FastEthernet0/0 overload
ip nat inside source route-map NAT_ISP interface FastEthernet0/1 overload
!
access-list 1 permit 172.16.1.0 0.0.0.255
access-list 2 permit any
!
!
!
!
route-map NAT_ISP permit 10
match ip address 1
match interface FastEthernet0/0
!
!
!
control-plane
!
!
!
!
!
!
!
!
!
!
line con 0
exec-timeout 0 0
password cisco
logging synchronous
login
line aux 0
line 66
no activation-character
no exec
transport preferred none
transport input all
transport output pad telnet rlogin lapb-ta mop udptn v120 ssh
line vty 0 4
password cisco
login
!
scheduler allocate 20000 1000
end

[paul driver · Accepted solution]

Hello
you need to enable ip routing and provide and provide a default route

Conf t
Ip routing
Ip route 0.0.0.0 0.0.0.0 (wan ip next hop)

What do you have attached to the fa0/0 LAN interface.
Do your clients receive a dhcp release.

Res
paul

Sent from Cisco Technical Support iPad App

[niiodaie76]

I have an AT&T router attached to fa0/0 and 3550 switch to Fa0/1.

thanks

[Renan Abreu · Accepted solution]

Why do you have two NATs configured? what are you trying to achieve there?

Routing is a good point to tshoot either.

[jawad-mukhtar · Accepted solution]

no ip nat inside source list 1 interface FastEthernet0/0 overload

no ip nat inside source route-map NAT_ISP interface FastEthernet0/1 overload

!

ip nat inside source list INTERNET-ACCESS interface FastEthernet0/0 overload

ip access-list extended INTERNET-ACCESS

permit ip 172.16.1.0 0.0.0.255 any

!

no ip dhcp pool insideDHCP

ip dhcp pool insideDHCP

   network 172.16.1.0 255.255.255.0

   default-router 172.16.1.1

   dns-server 68.94.156.1 68.94.157.

!

ip routing

!

interface fa 0/0

no shut

!

interface fa 0/1

no shut

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[niiodaie76]

Very helpful

made the neccessary changes and got it working.

Thanks