ARP not working in the external network to find GW MAC address

asked 2018-07-09 02:51:40 -0500

amirdhaoui gravatar image

I installed OpenStack Qeens on Ubuntu network option 2. My ext network is my managemet network Ext-net=192.168.2.0/24 GW=192.168.2.1

I created a private LAN and router to connect My internal network to ext-net. When I run an ARP discovering command in the router to find MAC@ of 192.168.2.1 I get nothing.

ip netns exec qrouter-XXX arping -I qg-f46136d2-68 192.168.2.1

The problem is in OpenStack or in the physical management network?

Thanks for any help.

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Comments

The gateway address is configured on qg-f46136d2-68. I.e. the interface that sends the ARP request would also have to send the ARP reply. I am not a networking expert, but perhaps the interface thinks this is silly and sulks.

Seriously, try this with any interface. Same result.

Bernd Bausch gravatar imageBernd Bausch ( 2018-07-09 10:10:57 -0500 )edit

For example, eth0 on my home server (physical machine) has address 192.168.1.16:

$ sudo arping -I eth0 192.168.1.16
ARPING 192.168.1.16 from 192.168.1.16 eth0
<sulks>
Bernd Bausch gravatar imageBernd Bausch ( 2018-07-09 10:12:01 -0500 )edit

The problem was from the physical router. I change it and the problem is resolved.

amirdhaoui gravatar imageamirdhaoui ( 2018-07-10 07:51:40 -0500 )edit