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Routing

SnarkyPrime
Level 1
Level 1

*First of all i want to apologize for my bad english*
I need some help with the routing.

Problems: I can't send pings from BORDER1 and BORDER2 to any other border router, but it does recieve ping from all of the border routers.
I can send pings from BORDER1 to the ISP routers.
I can only ping BORDER1 and BORDER2 from other border routers, but i can't ping the rest of them with each other (for example i cant ping BORDER4 from BORDER3). The ping only goes to the ISP, and not further

On the ISP routers i configured OSPF and advertised the route towards the border routers and to the another ISP. 
On the Border routers i configured static routing towards to the ISP (like this: ip route 0.0.0.0 0.0.0.0 Se0/0) 

I don't really know why is it not working, when i learned these things, i did not have to configure the routing with static and dynamic at the same time (probably because we did not try to do that with ISP router)
When we did the routing in school, we configured OSPF on every router, or we configured static routing, but it was not 0.0.0.0, but the actually network address.

1 Accepted Solution

Accepted Solutions

Friend I will do simple trick you can solve ALL routing issue in ALL case 

point1
do traceroute to destination, when the traceroute is stop check point 2

point2
count how many subnet in network, let assume it is 10 
you must see all 10 subnet in ANY router 
OR 
you must see

 connect subnet + default route 

in ANY router 

these two simple points SOLVE all routing issue in ALL topology in ALL case. 
good luck 


View solution in original post

6 Replies 6

balaji.bandi
Hall of Fame
Hall of Fame

With that information  - we can not say what is wrong here :

I would suggest to post below output from all devices

show run

show IP interface brief

show ospf neigh

show IP arp

show cdp neigh

 

BB

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SnarkyPrime
Level 1
Level 1

these files contains all of the information that you asked
on the border routers, i do not have any information about the ospf neighbor, because the ospf is only "linked" between the ISP routers, and the cdp neighbor was not enabled on any router except BORDER5 router 

Friend I will do simple trick you can solve ALL routing issue in ALL case 

point1
do traceroute to destination, when the traceroute is stop check point 2

point2
count how many subnet in network, let assume it is 10 
you must see all 10 subnet in ANY router 
OR 
you must see

 connect subnet + default route 

in ANY router 

these two simple points SOLVE all routing issue in ALL topology in ALL case. 
good luck 


Hello,

if this is a Packet Tracer project, post your zipped Packet Tracer project (.pkt) file...

chesterr
Level 1
Level 1

Hello,

Show routing table from all of the border routers.

SnarkyPrime
Level 1
Level 1

I found something.
I used the PDU ping all along, so i tried to ping in Privileged EXEC mode, it does work (everywhere) between the routers.  So the routing is fine.
But i still did not know why can't i ping from Border 1 to any other router using the PDU, so i checked the PDU ping tracer, like MHM Cisco World said, the destination was not the Router's public IP adress, but the router's private network (i dont know why). After i edited the destination IP to the public IP it did work.
So i dont know why did it change itself, but it does work fine now
Thank you guys for the help

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