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Verify communication in chain network topology

asked 2018-01-03 06:55:55 -0500

garyphone gravatar image

updated 2018-01-09 04:18:04 -0500

Dear guys, I have built a chain topology in OpenStack. A simple example is 3 nodes and 2 edges connection like below:


O1, O2, O3 are networks, X means router.

By using the VM(cirros image) I could verify O1 and O2, O2 and O3 are communicated. (ping the ip addresses for each other)

But I could not verify the communication between O1 and O3, theoretically they should be connected for each other.


About aforementioned chain O1--X--O2--X--O3, I have solved this problem by setting gateway in router config.

But when the chain topology likes below:


I have tried to set the gateways in router X1, X2, X3, but I could not ping the O4 ip address.

I guess the method should be similar. But it does not work.

I do not know why, and how to verify O1 could communicate to O4.

I am looking for your help to explain. Thanks.

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answered 2018-01-04 02:16:16 -0500

Need to configure routes in first router X1 to redirect traffic from O1 to O3 though X2 gateway, same reverse traffic X2 -> X1 gateway


01 network
02 network
03 network
X1 router and interfaces
X2 router and interfaces

O1 (ping -> X1 router (route to X2 gateway -> X2 ->

In routers config network routes:

X1: to router's gateway through interface

X2: to router's gateway through interface


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thanks for your reply, eduardo. I know how to do that. It works..

garyphone gravatar imagegaryphone ( 2018-01-04 02:52:48 -0500 )edit

dear @Eduardo Gonzalez, may i ask additionally about the routing loop problem, like this (question) Thanks deeply.

garyphone gravatar imagegaryphone ( 2018-01-08 03:55:00 -0500 )edit

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Asked: 2018-01-03 06:55:55 -0500

Seen: 50 times

Last updated: Jan 09