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buger / goreplay

GoReplay is an open-source tool for capturing and replaying live HTTP traffic into a test environment in order to continuously test your system with real data. It can be used to increase confidence in code deployments, configuration changes and infrastructure changes.
https://goreplay.org
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VXLAN with large MTU #1134

Open RoeiGanor opened 1 year ago

RoeiGanor commented 1 year ago

We are having a weird issue with capturing traffic with VXLAN. The issue is that for some requests we didnt receive response body. The setup goes as follow: an AWS ALB forward traffic to an application vm (Apache), the ALB port is mirrored to a goreplay in the same subnet.

After some investigation we noticed that both application VM and GOR VM have large MTU (9000) and lowering the application MTU lower than ~1500 fix the issue.

We cannot keep this low mtu in our environment, so this solution is not really viable for us.

This issue might be related to #1096 .

stephanemartin commented 1 year ago

Yes when we have developed this feature we have fixed the MTU. I'm thinking we can add parameter to customize and manage the jumbo frames. Or I don't know yet detect the MTU.

const VxLanPacketSize = 1526 //vxlan 8 B + ethernet II 1518 B