Help Confi guring Router

Dec 27, 2005 5 Replies

I am having some problems configuring a router, and I was hoping for some help.



Basically, I have a Cisco 2600 with a CSU/DSU (Serial 0/0) and a FastEthernet port. All I want to do is to hook a PC into the Fast Ethernet Port and access that computer connect to the Internet.



I have configure the Serial0/0 port with the T1 information provided to me from our service povider. I have configured the FastEhternet port and the computer connected to the FastEthernet port with public IP addresses that were also provided to me from our T1 provider.



The only other thing that have have done is added the following route to the router



ip route 0.0.0.0 0.0.0.0 Serial0/0



On the router, I am able to ping external websites like google, however, from the computer on the ethernet port I can only ping the FastEthernet port.



I know I am missing something simple, as this is the first time I have configured a router. Thanks for any help.



You have to turn on IP routing on the router..

conf t ip routing ctrl-z wri mem

If that does not work post config.

You have to turn on IP routing on the router..

conf t ip routing ctrl-z wri mem

If that does not work post config.

DO NOT configure a defafult static route pointing to an interface.

Instead point it to the next hop router IP address (i.e the IP address of the ISP upstream router). Otherwise you will end up with a huge ARP table in your router.

If you are able tp ping websites, then do a traceroute from your router to one of these websites. The first IP address returned in the traceroute will be the IP address you need to put in as the last argument of the default route statement:

ip route 0.0.0.0 0.0.0.0

Make sure you are able to ping this next hop IP address.

hi canonite,

if u want the router to pass traffic to the internet u have to configure NAT (network Address Translation) PAT (Port Address Translation)on the router...

First assign an ip from your internal ip-adress-space to fastethernet port and to your host (sth. like 192.168.0.1 on Fa0/0 and 192.168.0.2 on your host). Then configure NAT or PAT on your router...

configure sth like that:

ip access list 1 permit ip (your host)

ip nat outside source list 1 interface s0/0 (overload) then do a Ip nat outside on your s0/0 and an ip nat inside on your Fastethernet interface on the router...

this should work.

if not issue a show ip nat tarnslation command and post the output...

regards me...

Perform a traceroute from your router to one of the websites that you can ping.

Take the first IP address retunred which is the IP address of the ISP upstream router and change the default route statement to

ip route 0.0.0.0 0.0.0.0

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