03-19-2022 04:54 PM
So I got a 3925 router. Configured G0/0 for the cable modem. And configured G0/1 for my lan. The issue I’m having is I can ping google from the router but when I connect my laptop to the G0/1 port I cannot ping google. So for some reason the traffic from G0/1 is not being routed to the internet through G0/0. I have read countless posts and have tried many many things this is driving me crazy.
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03-19-2022 06:01 PM - last edited on 03-21-2022 11:55 AM by Translator
i see below command in the config
no ip routing.
change this to
ip routing
test it, still issue post
show run
again.
03-19-2022 05:28 PM - last edited on 03-21-2022 11:53 AM by Translator
can you post-show run from the router, Looks to me high-level NAT issue.
high-level config should look like below : (if you are not doing NAT on this router, then uplink cable mode need to be done the same and route back your lan IP addres range towards 3925 router from cable modem)
interface GigabitEthernet0/0
ip nat outside
!
interface GigabitEthernet0/1
ip nat inside (this is just example, if you using vlan then this config go to VLAN)
!
ip nat inside source list 1 interface GigabitEthernet0/0 overload
!
ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0 or uplink cable modem IP
!
access-list 1 permit 192.168.1.0 0.0.0.255 (chang ethis LAN IP address range)
!
03-19-2022 05:34 PM
Sorry I have to use pics as I’m working off my iPad as I cannot get my pic online
03-19-2022 05:47 PM - last edited on 03-21-2022 11:54 AM by Translator
Try the below changes : ( did PC get Lan ip range from DHCP ?)
no ip nat inside source list My_LAN interface GigabitEthernet0/0 overload
ip nat inside source list 1 interface GigabitEthernet0/0 overload
!
mo ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0
ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0 dhcp
!
access-list 1 permit 192.168.1.0 0.0.0.255
let me know how the test go. once change the config (still not working, post again new config)
03-19-2022 05:58 PM
03-19-2022 06:01 PM - last edited on 03-21-2022 11:55 AM by Translator
i see below command in the config
no ip routing.
change this to
ip routing
test it, still issue post
show run
again.
03-19-2022 06:05 PM
You are a genius the ip routing was the answer
03-20-2022 08:58 AM
Yup, to route packets, you need to insure routing is enabled.
Interesting, though, I recall (?) the default is IP routing is enabled on 39xx ISRs (since the expectation is for a router to route - many L3 switches, though, I recall [?] have IP routing disabled by default).
BTW, it also appears CEF is disabled. Generally, the recommendation is, when routing, to have it enabled.
03-20-2022 09:08 AM
03-19-2022 06:03 PM
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