Not able to acces internet or unable to ping gateway through Cisco 1841

[Arjun Chaudhari]

I have configured Cisco 1841 router for the ILL connectivity, but when I try to ping gateway or Google shows RTO.

Internet connection shows No Internet access,

My ISP IP 40.248.253.50  and Local IP is 192.168.0.1

and the gateway is 40.248.253.49

I have configured Isp Ip in Int Fa0/0 and Local Ip is FA 0/1, I have defined the DNS servers as well as default routs.

I get a response from 0/0 IP (40.248.253.50) and Int FA 0/1 but didn't get the response from Gateway 40.248.253.49 or DNS servers.

Please help to resolve the issue.

[paul driver · Accepted solution]

Hello

If you can please post the configuration of the rtr

[Arjun Chaudhari]

I have done Basic Configuration. I m fresher in the routing switching. Can you write a Configuration on Given Ip addresses? So I can make the same configuration on my router.

[Arjun Chaudhari]

Hello Paul.

I have done Basic Configuration. I m fresher in the routing switching. Can you write a Configuration on Given Ip addresses? So I can make the same configuration on my router.

[paul driver · Accepted solution]

Hello

Below is a very basic rtr configuration to establish internet connectivity ONLY from internal lan clients, Please note this doesn't not provide any security to your network whatsoever.

Suggest you use the built in security marco to harden you rtr. auto secure

conf t
int fa0/0
description wan ISP connection
ip address 40.248.253.50 255.255.255.252
ip nat outside
exit

int fa0/0
description Lan connection
ip address 192.168.0.1 255.255.255.0
ip nat inside
no shut
exit

ip route 0.0.0.0 0.0.0.0 fa0/0 40.248.253.49

ip dhcp pool LAN
network 192.168.0.0 /24
default-router 192.168.0.1
dns 8.8.8.8 8.8.4.4
lease 0 8
exit

ip dhcp excluded-address 192.168.0.1

access-list 10 permit 192.168.0.0 0.0.0.255
ip nat inside source list 10 interface fa0/0 overload

[Arjun Chaudhari]

Hi,
Thank's for the writing the solution.

I have made same configuration in my router but till facing same issue.

[Georg Pauwen · Accepted solution]

Hello,

try and change the default route to:

ip route 0.0.0.0 0.0.0.0 FastEthernet0/0

[Arjun Chaudhari]

Thanks for responding, It was very useful to me, my Issue resolved. now I m able to access the internet.

Do you know how to build a Security in Cisco 1841 router?

[paul driver]

Hello

Just to confirm you changed the default route to ip route 0.0.0.0 0.0.0.0 FastEthernet0/0 from ip route 0.0.0.0 0.0.0.0 fa0/0 40.248.253.49 and it worked?

if so please post the following, as specifying a default route towards a interface isn't really advisable
sh ip int brief

As for the security as you have very limited experience regards hardening a rtr suggest you run the security marco as I stated previously and follow the instructions

#auto secure