Forum Discussion
huzer
Nimbostratus
NimbostratusGRE Tunnel Issue
Has anyone run into an issue with GRE tunnels on a BIG-IP? I have a few setup running into a TGW in AWS and something seems to break them. Config change, Module change, ?? I haven't been able to pin ...
In case someone stumbles across this article in the future: TGWs in AWS utilize ECMP and as of this writing you're unable to turn that off. We were experiencing asymmetric routing as a packet destined to AWS was being sent out one VLAN and returned via a different VLAN. It was visible in the traffic capture but I was hung IP on the ICMP response due to traffic returning on the wrong VLAN where there wasn't a listener.
All credit to F5 support as they found the issue.
Juergen_Mang
MVP
MVPI have also had problems in the past with GRE tunnels. My fix was removing the GRE Tunnels and use a router for the tunnels.
