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ST_Wong's avatar
ST_Wong
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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...
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ST_Wong's avatar
ST_Wong
Icon for Cirrus rankCirrus
Jul 14, 2023

Hi all,

Here comes a simple diagram:

               VLAN 123
   ________________|_______________
   |                               |
192.168.8.0/24	             192.168.30.0/23
(gw 192.168.8.67)            (gw 192.168.31.254)
   |
  LTM (self IP on 192.168.8.0/24)
   |
  VS (192.168.31.250/23)

Some test results when ping from host (192.168.31.250)

* To 192.168.8.0/24:  OK, except the gateway 192.168.8.67

* To all other networks: no response

Inbound traffic from anywhere to the VS is okay.

Since the outbound packet goes through gw 192.168.8.67, i wonder if the gw will route any reply to 192.168.30.0/23, where the packets will be discarded to prevevnt IP spoofing.  Just wild guess...

Can I configure LTM to send outbound packets for 192.168.30.0/23 through gw 192.168.31.254 instead of using default gateway of LTM 192.168.8.67 ?     Sorry for the newbie question.

Thanks and Best Rgds