cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
4797
Views
5
Helpful
16
Replies

Can't Ping From local network to Router(ISP)

Max-kinpin
Level 1
Level 1

i have been having an issue with a lab i have been doing in packet tracer. i have a few networks configured connecting to their receptive sub-interfaces on router one. all the networks can communicate among each other as their networks are being advertised by ospf. Now router one is connected to router two, which in this case is my isp. For my local host to get to the internet they must use a default route. the problem is that i can ping router one from any of my networks
the configuration is as follows i just can't ping router two from those network. From router one to two i can ping.

R1

no ip domain-lookup
!
!
spanning-tree mode pvst
!
!
!
!
!
!
interface GigabitEthernet0/0/0
description Connection To ISP
ip address 145.207.45.2 255.255.255.252
duplex auto
speed auto
!
interface GigabitEthernet0/0/1
no ip address
duplex auto
speed auto
!
interface GigabitEthernet0/0/1.70
description Connection To Core Sw
encapsulation dot1Q 70
ip address 172.16.70.10 255.255.255.192
!
interface GigabitEthernet0/0/1.90
description Connection To Core Sw
encapsulation dot1Q 90
ip address 172.16.90.10 255.255.255.128
!
interface GigabitEthernet0/0/1.128
description Connection To Core Sw
encapsulation dot1Q 128
ip address 172.16.70.129 255.255.255.224
!
interface GigabitEthernet0/0/1.192
description Connection To Core Sw
encapsulation dot1Q 192
ip address 172.16.90.193 255.255.255.240
!
interface Vlan1
no ip address
shutdown
!
router ospf 1
log-adjacency-changes
network 172.16.70.0 0.0.0.63 area 0
network 172.16.90.0 0.0.0.127 area 0
network 172.16.70.128 0.0.0.31 area 0
network 172.16.90.192 0.0.0.15 area 0
default-information originate
!
ip classless
ip route 0.0.0.0 0.0.0.0 145.207.45.1
----------------------------------------------------------------------------------------------------------------
___________________________________________________________________
R2
no ip domain-lookup
!
!
spanning-tree mode pvst
!
!
!
!
!
!
interface GigabitEthernet0/0
description Connection R1
ip address 145.207.45.1 255.255.255.252
duplex auto
speed auto
!
interface GigabitEthernet0/1
no ip address
duplex auto
speed auto
shutdown
!
interface GigabitEthernet0/2
no ip address
duplex auto
speed auto
shutdown
!
interface Vlan1
no ip address
shutdown
!
router eigrp 1
network 145.207.0.0

16 Replies 16

There is certainly not any problem with the locals using a default route to get to the Internet. The important question here is how will the isp router know how to forward to the locals. Either the isp router must have a route for those subnets or your router needs to do address translation of traffic going to the isp router.

 

HTH

 

Rick

HTH

Rick

let me do that on the fly. i was thinking about that. the reason i didn't do it was because i was thinking that i should at the very least ping the 145.207.45.1. i have done something similar to this when i was learning vpn but no sub-interfaces just default route to the internet with one local device. will let you know though

Review Cisco Networking for a $25 gift card