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Occasional Contributor II
Posts: 14
Registered: ‎12-12-2012

Local to Master L2 tunnel: client mac address changes / packet loss

[ Edited ]

Hello,

 

I'm setting up a network with 2 x 3200 as a master / backup on main site and 650 as a branch office Local controller. I have set up a Layer 2 GRE tunnel from branch local controller to master cotroller. My idea is to get the branch users to same L2 / L3 network with my main site users.

 

I got the tunnel working and traffic seems to go thu the tunnel. Clients on remote site get ip from main site DHCP server. However I'm seeing significant packet loss when pinging some of my devices (those that are public network and go thu a firewall on main site). I captured some traffic from my firewall and noticed that some of the pacekets come from the clients mac address and some come from the controllers mac address. Also when packets were lost the firewall did not see them at all.

 

I don't seem to find any reason for this behavior.

 

Help appreciated

Occasional Contributor II
Posts: 14
Registered: ‎12-12-2012

Re: Local to Master L2 tunnel: client mac address changes / packet loss

I did some packet capture on my remote site controller and found something interesting.

 

I started pinging from a wired client (directly connected to the controller) on remote site to a network behind main site's gateway. When ping was ok i saw ICMP echo requests going to my main site gateways mac address and replies coming back. But when ping started to drop i saw ICMP echo requests going to the remote site's cortoller's mac address.

 

Can anyone expalin this behavior?

Guru Elite
Posts: 21,261
Registered: ‎03-29-2007

Re: Local to Master L2 tunnel: client mac address changes / packet loss

We would need to know the detail of your topology to possibly answer that question...

 



Colin Joseph
Aruba Customer Engineering

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Occasional Contributor II
Posts: 14
Registered: ‎12-12-2012

Re: Local to Master L2 tunnel: client mac address changes / packet loss

I figured this out. I had an ipsec tunnel from previous configuration that had overlappin ip address.

 

 

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