Way to change MTU on router

djb14336 wrote:

They have the Nokia locked down pretty tight.

Besides, unless you wanted to reduce it for some reason, it should be left as is.  It is set to 1420 for a reason, likely tied to the 464XLAT "tunnel" they use (has a sort of VPN impact), or other security/stability concerns they have upstream.

If you need to lower MTU to get a VPN working, then it should be done on the client side, ideally in that VPN's config.  Alternatively, could try forcing it through the OS or your own router if you are doing the double-NAT thing.  But the best place to do it is in the VPN config itself to avoid any potential fragmentation weirdness.

How can you tell the MTU is set at 1420 on the router?