Forum Discussion
Josiah_39459
Apr 26, 2016Historic F5 Account
That depends. You don't NEED one, but if you don't have one, then BOTH the BIG-IP needs a way to route to your server from a different self-ip, either via a route or the default tmm gateway (it can NOT use the management gateway), AND the server needs a route to the self-ip it receives the traffic from. If you are on the same subnet it is easy because you don't have to configure any routing.
As for VLANs, the logic is similar, you have to make sure the ingress/egress traffic have the same VLAN tag or disable VLAN-keyed connections (not recommended).
- Sarah_258804Apr 26, 2016
Cirrus
Is it recommended to have a self-IP in the same subnet as your vIPs or should I create a route on the F5 to and from the virtual servers instead? Right now I have a vIP in the same subnet as my external self-IP, is this not recommended? What is the best practice? - Theo_12742Apr 26, 2016
Cirrus
There is no best practice--the flexibility of the platform is you can do either, and there are reasons to do both. I will say the simpler way is to create the Self IP.- IRONMANJun 10, 2019
Cirrostratus
Can you please tell me reasons, why we use the VIP's are in different sub net?
- Sarah_258804Apr 26, 2016
Cirrus
Thanks Theo, for now I think I will keep my virtual servers in the same subnet as my external self-IPs. As long as there is no reason that I should not do this. - Sarah_258804Apr 26, 2016
Cirrus
Oh, quick question. Just want to make sure that having my external self-ip in the same subnet as my virtual servers will not affect Auto SNATing from the VS address to the external self-IP?