Cisco Router Route of Last Resort

Unanswered Question
Sep 14th, 2009

I am testing out a Cisco 1841 Router and need to set a route of last resort. I made a static route of "ip route". Then issued the command "ip default-network". This now allows me to ping anything on the network from the router. But I am not able to ping anything on the internet or outside of this network from the router. Here is my running config and routing table. What am I missing? fa0/0 is facing the network, and fa0/1 is facing another internal network.

Router#show run

Building configuration...

Current configuration : 925 bytes


version 12.4

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption


hostname Router





no aaa new-model

ip cef


no ip domain lookup

multilink bundle-name authenticated



log config



interface FastEthernet0/0

description outside LAN

ip address

duplex auto

speed auto


interface FastEthernet0/1

description internal LAN

ip address

duplex auto

speed auto


interface FastEthernet0/0/0


interface FastEthernet0/0/1


interface FastEthernet0/0/2


interface FastEthernet0/0/3


interface Vlan1

no ip address


ip forward-protocol nd

ip route

ip route


no ip http server




line con 0

line aux 0

line vty 0 4



scheduler allocate 20000 1000


Router#show ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route

Gateway of last resort is to network is variably subnetted, 2 subnets, 2 masks

C is directly connected, FastEthernet0/0

S [1/0] via

S* [1/0] via


I have this problem too.
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Paolo Bevilacqua Mon, 09/14/2009 - 11:07

Probably your internet GW doesn't know anything about the addresses you're using.

Note, "ip default-network" is of no use to you.

waterboy550 Mon, 09/14/2009 - 11:42

I ran the command no ip default-network to remove this and I'm still experiencing problems. Any thoughts?

Paolo Bevilacqua Mon, 09/14/2009 - 11:57

As mentioned above. Your other routers do not know about you. Are you doing a lab or this is for business ?

Paolo Bevilacqua Mon, 09/14/2009 - 12:18

Please go back to routing 101 where it explains how each router needs to know somehow about all the networks around.


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