ip interfaces

Panel11

Hi,
the previous internet provider provided me with a router with a 192.168.5.x/24 interface
So, I set up my two interfaces on my T20-W like this:

• the external one towards the router with 192.168.5.2 (being router 192.168.5.1) statically
• and the one towards the LAN (trusted) with 192.168.1.1/24

Now I have changed supplier which still offers me the same service, but the router has a 192.168.1.x/24 network and no longer 5.

Since my LAN lives in the 192.168.1.x network, can I still give the same subnet to the external interface?
Thank you

Bruce_Briggs

Not with Mixed routing mode - the default, since each routed interface (ie. external and trusted) needs to be from a different subnet.

We recommend not having your trusted network set to commonly used subnets such as 192.168.1.0/24, to prevent issues such as this.

Panel11

well, thanks for the suggestion.

Bruce_Briggs

You could switch to Drop-in mode, which allows 192.168.1.x/24 IP addrs on both external and trusted interfaces and internal devices.

There are a number of feature restrictions/limitations when in Drop-in mode:

Drop-In Mode
https://www.watchguard.com/help/docs/help-center/en-US/Content/en-US/Fireware/networksetup/net_config_dropin_about_c.html

Panel11

thanks for information!