Static routes and VLAN/Tunnel as Resource Type

Hi Piotr,

If you're asking what the BIG-IP does when you set a static route to point to a VLAN or tunnel instead of (for example) a next-hop gateway, then the BIG-IP should ARP for the destination address regardless of the configured IP addresses on the interface itself. The BIG-IP will ARP for the destination address using a locally configured source self-ip on that VLAN/tunnel.

That means that you need a proxy ARP device upstream to see the ARP request and respond.

In earlier software versions and under certain conditions, the BIG-IP would broadcast packets (L2 ff:ff:ff:ff:ff:ff) to the IP destination when the ARP goes unanswered. Some routers would happily route that, but the behaviour was deemed to be undesirable and should no longer occur.

Regards, Michael.