Messages in this thread | | | From | Lars Ekman G <> | Subject | ECMP is not flow-based for forwarded traffic >5.4.x | Date | Wed, 29 Apr 2020 07:35:57 +0000 |
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Hi,
From somewhere between 5.4.35 and 5.5.7 flow-based ECMP for forwarded traffic has stopped working. The fault is still present in 5.6.4 and t is present both for ipv4 and ipv6.
Ecmp is setup with (or corresponding ipv6);
ip route add 10.0.0.0/24 \ nexthop via 192.168.1.1 \ nexthop via 192.168.1.2 \ nexthop via 192.168.1.3 \ nexthop via 192.168.1.4
Packets are routed flow-based from the machine where this route is set (local works), but traffic forwarded through this machine is distributed packet-based. This is used as a primitive load-balancer and TCP connections fails.
Forwarded traffic is distributed flow-based in 5.4.35 and everything works. I might have missed some new config setting in 5.5.x. Sysctls;
# cat /proc/sys/net/ipv4/fib_multipath_hash_policy 1 # cat /proc/sys/net/ipv6/fib_multipath_hash_policy 0
Best Regards, Lars Ekman
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