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ip default-network problem

iamtheone12345
Level 1
Level 1

‎05-01-2012 04:47 AM - edited ‎03-04-2019 04:13 PM

Hi Guys,

I am having some issues with ip default-network command on packet tracer.

I have a toplogy of few routers running rip version 2.

I have configured ip default network command on one router pointing to to candiddate networks (2 sepearte static routes with 2 separate ip default-network

command.)The command seems to work properly as i can reach an outside network via one candidate network only at one time(the one that is first in the routing table).

However ,the RIP-2 is not propogating the ip default-network static routes to other routers.Am i doing something wrong here ?Should i be using RIP rather than RIP-2 ? i have pointed classfull networks in the ip default-network command.

If any one wants to look at the PT file i can certainly attach it.

Regards,

Arjun Das

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3 Replies 3

Richard Burts
Hall of Fame
Hall of Fame

‎05-01-2012 07:07 AM

Arjun Das

We need more detail about the topology and the configuration that you have done before we can identify the real problem and suggest solution. I do not have anything that can read packet tracer files. So perhaps you can just post the information? At a minimum we would want to see the specific default-network commands and the output of show ip route. Any other details you can provide might be helpful.

HTH

Rick

HTH

Rick
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iamtheone12345
Level 1
Level 1
In response to Richard Burts

‎05-01-2012 08:47 AM

Hi Richard,

All the details are below:(the topology is attached )

CBTRouter config

================

CBTrouter#show run

Building configuration...

hostname CBTrouter

!

!

!

interface FastEthernet0/0

description ###INTERNET ROUTER CONNCETION###

ip address 192.168.1.1 255.255.255.0

duplex auto

speed auto

!

interface FastEthernet0/1

no ip address

duplex auto

speed auto

shutdown

!

interface Serial1/0

ip address 68.110.171.98 255.255.255.224

no cdp enable

clock rate 64000

!

interface Serial1/1

ip address 100.110.171.98 255.255.255.0

clock rate 64000

!

interface Serial1/2

no ip address

!

interface Serial1/3

no ip address

!

router rip

network 68.0.0.0

network 100.0.0.0

network 192.168.1.0

!

ip classless

ip default-network 4.0.0.0

ip default-network 5.0.0.0

!

end

CBTrouter#show ip route

Gateway of last resort is 68.110.171.97 to network 4.0.0.0

R*   4.0.0.0/8 [120/1] via 68.110.171.97, 00:00:16, Serial1/0

R*   5.0.0.0/8 [120/1] via 100.110.171.97, 00:00:21, Serial1/1

     68.0.0.0/27 is subnetted, 1 subnets

C       68.110.171.96 is directly connected, Serial1/0

     100.0.0.0/24 is subnetted, 1 subnets

C       100.110.171.0 is directly connected, Serial1/1

C    192.168.1.0/24 is directly connected, FastEthernet0/0

R    192.168.2.0/24 [120/1] via 192.168.1.2, 00:00:24, FastEthernet0/0

R    192.168.3.0/24 [120/2] via 192.168.1.2, 00:00:24, FastEthernet0/0

R1 config

===========

R1#show run

hostname R1

!

!

interface FastEthernet0/0

ip address 192.168.1.2 255.255.255.0

duplex auto

speed auto

!

interface FastEthernet0/1

no ip address

duplex auto

speed auto

shutdown

!

interface Serial1/0

ip address 192.168.2.1 255.255.255.0

clock rate 64000

!

interface Serial1/1

no ip address

!

interface Serial1/2

no ip address

!

interface Serial1/3

no ip address

!

interface Vlan1

no ip address

shutdown

!

router rip

network 192.168.1.0

network 192.168.2.0

!

ip classless

!

end

R1#show ip route

Gateway of last resort is not set

R    4.0.0.0/8 [120/2] via 192.168.1.1, 00:00:18, FastEthernet0/0

R    5.0.0.0/8 [120/2] via 192.168.1.1, 00:00:18, FastEthernet0/0

R    68.0.0.0/8 [120/1] via 192.168.1.1, 00:00:18, FastEthernet0/0

R    100.0.0.0/8 [120/1] via 192.168.1.1, 00:00:18, FastEthernet0/0

C    192.168.1.0/24 is directly connected, FastEthernet0/0

C    192.168.2.0/24 is directly connected, Serial1/0

R    192.168.3.0/24 [120/1] via 192.168.2.2, 00:00:13, Serial1/0

R2 config

==============

R2#show run

hostname R2

!

interface FastEthernet0/0

ip address 192.168.3.1 255.255.255.0

duplex auto

speed auto

!

interface FastEthernet0/1

no ip address

duplex auto

speed auto

shutdown

!

interface Serial1/0

ip address 192.168.2.2 255.255.255.0

!

interface Serial1/1

no ip address

!

interface Serial1/2

no ip address

!

interface Serial1/3

no ip address

!

interface Vlan1

no ip address

shutdown

!

router rip

network 192.168.2.0

network 192.168.3.0

!

ip classless

!

!

end

R2#show ip route

Gateway of last resort is not set

R    4.0.0.0/8 [120/3] via 192.168.2.1, 00:00:23, Serial1/0

R    5.0.0.0/8 [120/3] via 192.168.2.1, 00:00:23, Serial1/0

R    68.0.0.0/8 [120/2] via 192.168.2.1, 00:00:23, Serial1/0

R    100.0.0.0/8 [120/2] via 192.168.2.1, 00:00:23, Serial1/0

R    192.168.1.0/24 [120/1] via 192.168.2.1, 00:00:23, Serial1/0

C    192.168.2.0/24 is directly connected, Serial1/0

C    192.168.3.0/24 is directly connected, FastEthernet0/0

ISPRouter config

===================

ISProuter#show run

hostname ISProuter

!

!

interface Loopback1

ip address 4.2.2.1 255.255.255.0

!

interface FastEthernet0/0

no ip address

duplex auto

speed auto

shutdown

!

interface FastEthernet0/1

no ip address

duplex auto

speed auto

shutdown

!

interface Serial1/0

ip address 68.110.171.97 255.255.255.224

!

interface Serial1/1

no ip address

!

interface Serial1/2

no ip address

!

interface Serial1/3

no ip address

!

interface Vlan1

no ip address

shutdown

!

router rip

network 4.0.0.0

network 68.0.0.0

!

ip classless

!

end

ISProuter#show ip route

Gateway of last resort is not set

     4.0.0.0/24 is subnetted, 1 subnets

C       4.2.2.0 is directly connected, Loopback1

R    5.0.0.0/8 [120/2] via 68.110.171.98, 00:00:20, Serial1/0

     68.0.0.0/27 is subnetted, 1 subnets

C       68.110.171.96 is directly connected, Serial1/0

R    100.0.0.0/8 [120/1] via 68.110.171.98, 00:00:20, Serial1/0

R    192.168.1.0/24 [120/1] via 68.110.171.98, 00:00:20, Serial1/0

R    192.168.2.0/24 [120/2] via 68.110.171.98, 00:00:20, Serial1/0

R    192.168.3.0/24 [120/3] via 68.110.171.98, 00:00:20, Serial1/0

ISPRouter2 config

==============

ISPRouter2#show run

hostname ISPRouter2

!

!

interface Loopback1

ip address 5.2.2.1 255.255.255.0

!

interface FastEthernet0/0

no ip address

duplex auto

speed auto

shutdown

!

interface FastEthernet0/1

no ip address

duplex auto

speed auto

shutdown

!

interface Serial1/0

ip address 100.110.171.97 255.255.255.0

!

interface Serial1/1

no ip address

shutdown

!

interface Serial1/2

no ip address

shutdown

!

interface Serial1/3

no ip address

shutdown

!

interface Vlan1

no ip address

shutdown

!

router rip

network 5.0.0.0

network 100.0.0.0

!

ip classless

!

!

end

ISPRouter2#show ip route

Gateway of last resort is not set

R    4.0.0.0/8 [120/2] via 100.110.171.98, 00:00:25, Serial1/0

     5.0.0.0/24 is subnetted, 1 subnets

C       5.2.2.0 is directly connected, Loopback1

R    68.0.0.0/8 [120/1] via 100.110.171.98, 00:00:25, Serial1/0

     100.0.0.0/24 is subnetted, 1 subnets

C       100.110.171.0 is directly connected, Serial1/0

R    192.168.1.0/24 [120/1] via 100.110.171.98, 00:00:25, Serial1/0

R    192.168.2.0/24 [120/2] via 100.110.171.98, 00:00:25, Serial1/0

R    192.168.3.0/24 [120/3] via 100.110.171.98, 00:00:25, Serial1/0

127174-ROUTER_CONFIGS.txt.zip
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iamtheone12345
Level 1
Level 1
In response to iamtheone12345

‎05-01-2012 08:52 AM

Hi richard,

By the way i am now running RIP-1 in this lab.No static routes configured.I am using RIP in all routers.

used ip default-network on CBTrouter to point to 2 networks as candidate for default route.

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