Forum Discussion
james_lee_31100
Nimbostratus
NimbostratusOne arm and routing
Hi,
Is it possible I could have ltm one arm on vlan10 and vlan20, and both vlans gateway are on the core with hsrp, a client is on vlan 100, it's gateway also on core switch with hsrp..
How ltm handle the return traffic, if client accesses VIP on vlan10(snat), or vlan20(snat)
Thx
4 Replies
mimlo_61970Cumulonimbus
Yes it is possible. By default F5 utilizes a auto last hop feature, it will return traffic to the client on the same interface the request was received on.
https://support.f5.com/kb/en-us/solutions/public/13000/800/sol13876.html
james_lee_31100Thanks I missed that, so there is no need to configure routing table on ltm?
Thx
- mimlo_61970correct, even if you do have a routing table, auto last hop overrides it anyway. Routing table is useful for sourcing traffic(like how to reach your backend server in a one arm config if the ltm isn't local to it)
Jason_40733Cirrocumulus
mimlo nailed it. F5 'magic' always sends the return out the interface the request came from.
Jason
