Issues with Overlay Routing and AWS Gateway Load Balancer

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Issues with Overlay Routing and AWS Gateway Load Balancer

Cyber Elite
Cyber Elite

Hey Folks,


I am having difficulties to get Overlay routing working with AWS GWLB and I was wondering is it something that I am doing wrong or missing some configuration element...


Any of you using AWS GWLB with overlay routing enabled?


In my test setup when overlay routing is enabled the test VM is able to reach internet over the PAN FW - Outbound is working fine.

But East-West between VPCs and Inbound traffic is not working. I can see traffic hitting the firewall, but allow traffic log show only byte send and no return traffic. Packet capture on the destination (for both east-west and inbound) doesn't show traffic to be arriving, so it looks like once FW inspect the packet and send back to GWLBe it doesn't send it in the correct direction.

If overlay routing is disabled everything works - east-west, inbound and outbound.


I found some old discussions mentioning issues with overlay routing, but from what I understand those know issues were for version 10.0.x, while we have tested with 10.2.1 and 10.1.6







The appliance modes are enabled, of course...they have to be! But more to the point: how otherwise would downgrading to 10.1.5-h5 work?! How would outbound flows work? but not East-West traffic flows?

In summary: it is a firmware version issue - not an appliance issue or configuration issue.



L2 Linker

Just hit this issue while running 10.1.6. It's reportedly fixed in 10.1.6-h6 and I can confirm this having upgraded. 

Didn't stop me wasting a whole morning debugging it though...


Cyber Elite
Cyber Elite

Hey Folks,


I haven't tracked this topic for very long time, it feels good to know that you are not insane and other are having the same problems...

Thank you @npandey for the insight. I can see 10.1.7 are officially released today and it looks like it is fixing the problem with the overlay routing:

Fixed an issue on Amazon Web Services (AWS) Gateway Load Balancer (GWLB) deployments with overlay routing enabled where intra-zone packets were re-encapsulated with the incorrect source/destination MAC address.

I probably will not be able to test it anytime soon, because we already agreed on the design with disabled overlay routing and wouldn't change it soon.



L0 Member

Hey Folks,

Can anyone tell if you have already tested this version 10.1.7 with the fix?

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