Asymmetric routing F5 (different Inbound and outbound traffic)

Hi Hendroes,

the

auto-last-hop

feature is enabled by default and causes the F5 to use the

SRC_MAC

of the received connection as the next-hop MAC address while sending data through this connection.

If you disable the

auto-last-hop

feature either globaly or individually on certain configuration object, the F5 will fallback to its L3 routing table to locate the next-hop mac while sending outgoing data through this connection.

In addition to that you can write some iRule to specify the next hop programatically based on every criteria you can think of and even more (via

[nexthop]

command). This is Policy-Based-Routing (PBR) on steriods! 😉

For further reading: https://support.f5.com/csp/article/K13876

Cheers, Kai