Unable to ping Virgin ISP Hub on 192.168.0.1 from another router on my home lab

[sschumaher]

Hello guys, I am struggling a bit with my home lab setup as I am going through the ICDN1 and 2 and while testing and building the lab and working with static and RIP routing I was trying to test something and I cannot get it to work so I want to share with you to see if you guys can help me figure this out.

My Setup: I have a Virgin Media HUB Broadband running as a router and assigning IP addresses via DHCP - it's ip address is 192.168.01 -  it's connected to my 1st Cisco 1841 Router (RT1) on FE 0/0 which has the following IP address assigned by the Virgin Router 192.168.0.19 - if I ping 192.168.0.1 from RT1 it works fine - the issue is trying to ping 192.168.0.1 (Virgin Router) from any other of my Cisco routers.
Even though I added static routes and also used rip to advertise all networks connected to all routers interface - from RT2 and RT3 I can ping RT1 on it's interface FE0/0 using 192.168.0.19 - but if I try to ping 192.168.0.1 I don't get a reply. I wonder what I am missing....

Devices on my LAN
Virgin Media Broadband - IP address 192.168.0.1

Cisco 1841 devices and it's ip addresses:

RT1 FE 0/0 - 192.168.0.19 - assigned by DCHP by Virgin router

RT1 FE 0/1 - 10.0.0.1 - connected to FE 0/1 of RT2

RT2 FE 0/0 - 192.5.20.1 - connected to FE 0/0 of RT3

RT2 FE 0/1 - 10.0.0.2 - connected to FE 0/1 of RT1

RT3 FE 0/0 - 192.5.20.2 - connected to FE 0/0 of RT2

RT3 FE 0/1 not being used

******************************************************************

When using rip I have enabled version 2 and used all network statments and I can see network 192.168.0.0 is being adversited on all routers via RIP - what I don't understand is how come I can ping 192.168.0.1 from RT1 but not from the routers, I tried doing a tracert but it dies on the following hop - RT1 FE 0/1 - 10.0.0.1 

I can share more info tomorrow - I won't be able to paste my configs here - but I will add more info tomorrow but any thoughts from the community is highly appreciated.

kind regards,
Seb

[Francesco Molino]

Hi

Can you share sh ip route output from all your router?

On your Media Hub, did you also activated Rip or do you have any static route for reverse traffic (how to reach subnets in RT2 And RT3?)

[sschumaher]

Hello Francesco, of course - thanks for checking this - by the way I have made some changes on the configs as I am playing around with it but so far still the same - I can only ping the Virgin Media Hub/Router from my RT1 - by the way - when you asked: Did I activate RIP on the Virgin Media Hub, I don't think I can do that - and in regards to having a static route for reversing the traffic I don't know what network statements I should use for that, I thought the routers would learn how to route the traffic based on the RIP networks statements I have used so far - but I think the issue I have right now is exactly related to what you pointed out - THE REVERSE traffic - right now I can easily ping from RT3 or RT2 to the FE 0/0 on RT1 ip address 192.168.0.19 and it works fine (this is the what I don't get it, home come only RT1 can ping and reach - I guess because it's directly connected but the other routers learned using RIP) - the issue is when I ping something in the 192.168.0.0 network and I don't get a reply - I have done a trace and it seems the traffic doesn't know how to come back anyway - let me stop talking and share the output from RT1, RT2 and RT3  that you have asked me for. Some of the initial info I provided on my first post has changed - such as the connection between RT2 and RT3 - I am using a serial port instead - but the main issue is still present -  let me know what you reckon I could try as next step. thanks a lot.

RT1

RT1#sh ip route
Codes: L - local, 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, + - replicated route

Gateway of last resort is 192.168.0.1 to network 0.0.0.0

S* 0.0.0.0/0 [1/0] via 192.168.0.1
10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 10.0.0.0/30 is directly connected, FastEthernet0/1
L 10.0.0.1/32 is directly connected, FastEthernet0/1
192.168.0.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.0.0/24 is directly connected, FastEthernet0/0
L 192.168.0.19/32 is directly connected, FastEthernet0/0
R 195.5.20.0/24 [120/1] via 10.0.0.2, 00:00:09, FastEthernet0/1

RT2

RT2#sh ip route
Codes: L - local, 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, + - replicated route

Gateway of last resort is 10.0.0.1 to network 0.0.0.0

R* 0.0.0.0/0 [120/1] via 10.0.0.1, 00:00:21, FastEthernet0/0
10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 10.0.0.0/30 is directly connected, FastEthernet0/0
L 10.0.0.2/32 is directly connected, FastEthernet0/0
R 192.168.0.0/24 [120/1] via 10.0.0.1, 00:00:21, FastEthernet0/0
195.5.20.0/24 is variably subnetted, 2 subnets, 2 masks
C 195.5.20.0/30 is directly connected, Serial0/0/1
L 195.5.20.1/32 is directly connected, Serial0/0/1

RT3

RT3#sh ip route
Codes: L - local, 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, + - replicated route

Gateway of last resort is 195.5.20.1 to network 0.0.0.0

R* 0.0.0.0/0 [120/2] via 195.5.20.1, 00:00:27, Serial0/0/1
R 10.0.0.0/8 [120/1] via 195.5.20.1, 00:00:27, Serial0/0/1
R 192.168.0.0/24 [120/2] via 195.5.20.1, 00:00:27, Serial0/0/1
195.5.20.0/24 is variably subnetted, 2 subnets, 2 masks
C 195.5.20.0/30 is directly connected, Serial0/0/1
L 195.5.20.2/32 is directly connected, Serial0/0/1

[Georg Pauwen]

Hello,

as far as I know none of the Virgin Media hubs let you activate routing protocols or even static routes, these are 'dumb' boxes that dish out IP addresses for a flat network. Your only option to get connectivity from any of your Cisco routers is to configure NAT on the router directly connected to the media hub.

If you don't know how to configure NAT, post the configuration of your R1 router (the one directly connected to the hub), so we can fill in the necessary bits and pieces...

[sschumaher]

Thanks for sharing your knowledge - I agree with you in regards to the Virgin Media Hub not allowing routing protocols or static routes - so I have listened to what you said and I was just able to input some new config into my RT1 and now it seems I can ping 192.168.0.1 which is the Virgin Media Router IP address from other subnets that I couldn't before such as the 192.168.1.0 network connected to RT2 - below is the config I have used... - will share and any other suggestions on how I can do this is welcome as this is helping me building up my knowledge - thank you very much

interface FastEthernet0/0
description INTERNET VIRGIN MEDIA WAN PORT
ip address 192.168.0.19 255.255.255.0
ip nat outside
ip virtual-reassembly
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 10.0.0.1 255.255.255.252
ip nat inside
ip virtual-reassembly
duplex auto
speed auto

!
ip nat inside source list 1 interface FastEthernet0/0 overload
ip route 0.0.0.0 0.0.0.0 192.168.0.1
!
access-list 1 permit 192.168.1.0 0.0.0.255
*************************************************************

My conclusion is that on this setup the only way for other networks connected to RT2 and RT3 to communicate with my Virgin Media Router on 192.168.0.1 is by using Nat..... if I am wrong let me know

Thanks
Seb

[Georg Pauwen · Accepted solution]

Hello Seb,

the config is almost right. Your access list 1 needs to reflect what is on the inside of your NAT, which in your case is 10.0.0.1/30. So the access list needs to be:

access-list 1 permit 10.0.0.0 0.0.0.3

If you have other networks behind your router, just add those to the access list. As an example, if you have another local network 172.16.1.1/24, the access list should be:

access-list 1 permit 10.0.0.0 0.0.0.3

access-list 1 permit 172.16.1.0 0.0.0.255

[sschumaher]

that's perfect - living, configuring and learning - happy times - thank you all for your input on this - greatly appreciated.
All working on my side now.

kind regards,
Seb