Forum Discussion

ST_Wong's avatar
ST_Wong
Icon for Cirrus rankCirrus
Jul 12, 2023

Multiple IP addresses ranges on external network

Hello, We've LTM (14.1.4.2) running for years, serving VLAN with addresses 192.168.8.0/24. Recently the same VLAN 'expanded' with another address range (192.168.31.0/23). We tried to define virtua...
application delivery
ST_Wong's avatar
ST_Wong
Icon for Cirrus rankCirrus
Jul 13, 2023

Hi all,

Thanks for all your help.

Inbound traffic now works, however, the default gateway on original subnet 192.168.8.0/24 seems won't help routing traffic for 192.168.31.0/23.    All outbound traffic to non-local network got timeout.   

Can we forward outbound traffic for the new IP range 192.168.31.0/23 to corresponding gateway 192.168.31.254 ?

Thanks and Best Rgds

  • JRahm's avatar
    JRahm
    Icon for Admin rankAdmin
    Jul 13, 2023

    a diagram of what's local and what's remote and where you're wanting traffic to route would be helpful.

    Just note a couple things:

    1. auto-lasthop will return application traffic responses to where it came from unless you disable that behavior, so for response traffic anyway, you don't even need a default route from BIG-IP.
    2. An effective route is not enough to forward traffic through BIG-IP, you need to enable a network forwarding virtual server that is enabled on the ingress vlan in order for traffic initiating from that ingress network to egress the BIG-IP to another vlan.