Solved: Need to use same IP on two interfaces

agarwalgaurav3344@gmail.com · ‎07-31-2024

Hello,
I want to use same subnet IP on two interfaces of same router, to connect Firewall in HA under edge device. I need 2 connections from each router to each firewall.
below is by configuration
R1
G0/0: ISP A IP
G0/1: 172.16.1.2/23
R2
G0/0: ISP B IP
G0/1: 172.16.1.3/23
on G0/0: BGP is there
on G0/1: GLBP is configured to make redundancy in both router LAN
Default Routing is also configured in case if ISP went down
now I need to configure interface G0/2 in the same subnet so I can add both firewall with both routers.

bbb bbb · ‎07-31-2024

Dear agarwalgaurav3344@gmail.com ,

How about use a switch between the router and FW. because router will not allow to add an IP address of the same subnet of another interface on the same router. The switch may also provide additional flexibility if in case you want to add few more devices on the same subnet (and using VLANs for other subnet).

Let us know how we can help.

pls rate helpful post.

happy to help

best regards,

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