Help connecting 2501 router to Belkin router

gajananbhat

Hi,

I am practising for CCNA and i was trying to see if this is possible.

I have a cisco 2501 and a 2505 router, a cable modem, a belkin router and a PC.

the network config is like this..

Internet--Cable modem--Belkin--2501--2505--PC

I have setup the network such that belkin-2501 is on one network...
2501-2505 is on another ...and 2505-PC is on the third...

I can ping the PC from 2501.
I can ping belkin from 2501.
I can ping 2501 from PC.
But, I cannot ping belkin from PC.
I cannot ping belkin from 2505.

Is there a way that I can connect to the internet from the PC using this config?

Thanks
Gajanan

Webmaster

Hi,

The reason you can't connect to the Belkin router (hence Internet) from the 2505 and the PC is because the Belkin router doesn't know the route (back) to the 2505 and the PC. You could either configure RIP on the cisco 'and' the Belkin router (assuming it supports it) or configure static routes. Currently the Belkin router is not involved in the routing process and assumes your network between 2501 and 2505 and between 2505 and PC are non-local, hence on the Internet side of the router. After you set up the routing correctly, you should check whether the 2505 contains a gateway of last resort/default route to the internal IP of the Belkin routers.

This issue popped up several times before in the forums so you may want to do a search.

Feel free to post the relevant portions of your router configs and sh ip ro outputs.

gajananbhat

Hi,

Thanks for the prompt reply.
Here is some more info.

The belkin-2501 network is 192.168.2.0
2501-2505 is 192.168.30.0
2505-pc is 192.168.20.0

Belkin ip is 192.168.2.1

Belkin

---

2501

---

2505

---

PC
192.168.2.1 2.2 30.2 30.1 20.1 20.5


Here is the 2501 config:

hostname Router2501
!
!
no ip domain-lookup
!
interface Ethernet0
ip address 192.168.2.2 255.255.255.0
!
interface Serial0
ip address 192.168.30.2 255.255.255.0
!
interface Serial1
no ip address
no ip mroute-cache
shutdown
no cdp enable
!
ip default-gateway 192.168.2.1
no ip classless
ip route 192.168.20.0 255.255.255.0 192.168.30.1
!
line con 0
exec-timeout 0 0
line aux 0
line vty 0 4
no login
!
end


And here is the 2505 config:

hostname Router2505
!
!
!
ip subnet-zero
no ip domain-lookup
!
!
hub ether 0 1
link-test
auto-polarity
!
hub ether 0 2
link-test
auto-polarity
!
...

interface Ethernet0
ip address 192.168.20.1 255.255.255.0
!
interface Serial0
ip address 192.168.30.1 255.255.255.0
no fair-queue
clockrate 64000
!
interface Serial1
no ip address
no ip mroute-cache
shutdown
!
ip default-gateway 192.168.20.1
ip classless
ip route 192.168.2.0 255.255.255.0 192.168.30.2
ip http server
!
!
line con 0
line aux 0
line vty 0 4
no login
!
end


Please let me know what else i need to configure.

Thanks

gajananbhat

Some more info:

sh ip route for

2501:

C 192.168.2.0/24 is directly connected, Ethernet0
C 192.168.30.0/24 is directly connected, Serial0
S 192.168.20.0/24 [1/0] via 192.168.30.1


for 2505:

C 192.168.30.0/24 is directly connected, Serial0
C 192.168.20.0/24 is directly connected, Ethernet0
S 192.168.2.0/24 [1/0] via 192.168.30.2

Thanks
Gajanan

rossonieri#1

can you ping belkin from 2501??
try to use standard dynamic routing prots (RIP/OSPF) instead of static - to see how your routers (belkin and cisco) learn their networks...

Webmaster

gajananbhat wrote:

I can ping belkin from 2501.

rossonieri#1 wrote:

can you ping belkin from 2501??

Those two are on the same (sub-)network, in this case the same cable, even with out any form of routing these two would be able to ping eachother.

Please let me know what else i need to configure.

The Belkin router. It needs to have routes for the network 192.168.20.0 and 192.168.30.0. If you would be using RIP for example, it would learn the routes to those networks from the Cisco routers, and the Cisco routers would learn the gateway of last resort (where all internet traffic should go to) from the Belkin router.

Or, try following rossonieri's advice and enable rip on the routers and see what the routing table should look like.

QUIX0TIC

IMHO, Enabling RIP will not help very much in this case.

WebMaster is SPOT-ON regarding the Belkin Cable/Router does not have any routes to the other networks. Even though you want to set the DefGW towards the Internet side... you must set some type of static route to see the other 30.x and 20.x subnets.

You can verify this by setting up ip debug on the 2501 and 2505 and watch the packet go through both routers but get dropped when it attempts to get back.

What Belken switch do you have? What is the model number? I ask this to find out if the switch can use RIPv2. I know a lot of newer switches can use RIPv2 and you can accomplish your task as long as it supports it.

gajananbhat

Hi All,

Thanks for the responses people....

I dont have access to my network right now....but will try out your suggestion on the belkin router and see if it works when i get back home.

Also, quixotic said:

You can verify this by setting up ip debug on the 2501 and 2505 and watch the packet go through both routers but get dropped when it attempts to get back.

Maybe I didnt understand this correctly...but, I can ping the belkin router from 2501....which means that packets from 2501 are not being dropped when it attempts to gets back.

Also, i will let you know what the model number of the belkin router is when i get home...

Thanks
Gajanan

gajananbhat

Hi All,

I tried enabling RIP ....but i am still not able to ping belkin frm 2505 or the PC.

My belkin model is 72304

thanks

rossonieri#1

gajananbhat wrote:

Hi All,

I tried enabling RIP ....but i am still not able to ping belkin frm 2505 or the PC.

My belkin model is 72304

thanks

hi,
1. try to post the dynamic route.
2. try to change ip default gateway on 2505 to 30.2 - maybe this is the problem. (if you dont want to use rip on 2501+2505)
3. try to post your belkin config.