04-19-2020 05:25 AM - edited 04-19-2020 05:27 AM
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
04-19-2020 07:01 AM
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
04-19-2020 11:00 AM
04-19-2020 11:18 PM
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?
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