cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
938
Views
0
Helpful
3
Replies

Cascaded routers and static routing

zorzig
Level 1
Level 1

Hi everybody!
I am cascading a cisco 1841 (R1) to a SOHO tp-link adsl router(R0).
Cascaded to the 1841 there is another netgear SOHO router(R2).
Internet ---R0--- R1---R2---LAN
R0 has 4 lan ports serving addresses in 192.168.1.0/24, and R0's ip address is 192.168.1.1.
I configured Fa0/0 of R1 with ip address 192.168.1.2 255.255.255.0.

Then I configured Fa0/1 of R1 with ip address 192.168.2.1 255.255.255.252.

Finally, I created a wan interface on R2 with ip address 192.168.2.2 255.255.255.252.
R2 has 4 LAN ports: 1 is repurposed as the aforementioned wan interface, the other 3 are serving addresses in 10.0.0.0/24.
I configured static routing on both R1 and R2:

R1> sh 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 192.168.1.1 to network 0.0.0.0

     10.0.0.0/24 is subnetted, 1 subnets
S       10.0.0.0 [1/0] via 192.168.2.2
C    192.168.1.0/24 is directly connected, FastEthernet0/0
     192.168.2.0/30 is subnetted, 1 subnets
C       192.168.2.0 is directly connected, FastEthernet0/1
S*   0.0.0.0/0 [1/0] via 192.168.1.1, FastEthernet0/0

On R2 I configured the following static routes:
0.0.0.0 0.0.0.0 via 192.168.2.1

Given this setup, I cannot ping ip 192.168.1.1 from LAN 10.0.0.0/24.
And I cannot ping any Internet public ip (tested with 8.8.8.8) from R1.
I fail to see what I'm doing wrong, any pointers in the right direction would be much appreciated.
Thanks in advance

Giacomo

3 Replies 3

luis_cordova
VIP Alumni
VIP Alumni

Hi @zorzig 

 

I think you are missing a NAT on R1.
This is because R0 does not have a route to network 10.0.0.0
Try this on R1:

access-list 1 permit 10.0.0.0 0.0.0.255

ip nat inside source list 1 interface f0/0 overload

 

interface f0/0

ip nat outside

interface f0/1

ip nat inside

 

Regards

I'm sorry, I forgot to mention I configured R0 with the static route
10.0.0.0 255.255.255.0 via 192.168.1.2 as well.

Abzal
Level 7
Level 7

Hi,

 

try this on R1:

 

ping 192.168.1.1 source 192.168.2.1

 

try this from LAN 10.0.0.0:

 

ping 192.168.2.1

 

Is R2 WAN interface connected to R1 LAN port?

Best regards,
Abzal
Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: