TAILMON TAILMON v1.3.0 -Aug 24, 2025- WireGuard-based Tailscale Installer, Configurator and Monitor (Available in AMTM!)

[Viktor Jaep]

As far as I know Merlin specifically sets the kernel values in the firewall code:

asuswrt-merlin.ng/release/src/router/rc/firewall.c at 9def7bc5f81986dfec82e56cd0f9665f130be88b · RMerl/asuswrt-merlin.ng

Third party firmware for Asus routers (newer codebase) - RMerl/asuswrt-merlin.ng

github.com

So unless he's not in "router mode" I can't think why it wouldn't be set.

@fisk ... please see above. This setting should be on by default. Like @ColinTaylor said, if you're not already in "router mode" (UI -> administration -> operation mode), then there's something else going on. Worst case, I think that would necessitate you possibly needing to reflash a fresh copy of the firmware to ensure all defaults are back in place.

 

[fisk]

As far as I know Merlin specifically sets the kernel values in the firewall code:

asuswrt-merlin.ng/release/src/router/rc/firewall.c at 9def7bc5f81986dfec82e56cd0f9665f130be88b · RMerl/asuswrt-merlin.ng

Third party firmware for Asus routers (newer codebase) - RMerl/asuswrt-merlin.ng

github.com

So unless he's not in "router mode" I can't think why it wouldn't be set.

Definitely in Router Mode. This was unchanged, fresh Merlin install as of this week, on a brand new router.

 

[fisk]

@fisk ... please see above. This setting should be on by default. Like @ColinTaylor said, if you're not already in "router mode" (UI -> administration -> operation mode), then there's something else going on. Worst case, I think that would necessitate you possibly needing to reflash a fresh copy of the firmware to ensure all defaults are back in place.

Appreciated!

All is working (very smoothly and to family satisfaction) now - so I'm not going to poke at it further.

 

[Viktor Jaep]

Appreciated!
View attachment 68433
All is working (very smoothly and to family satisfaction) now - so I'm not going to poke at it further.

Glad it's working... not sure what to tell you about those settings.