MTU size and VPN problems

A friend of mine has been trying for about 2 years to get his work laptop to work with his router at home. Regular internet worked fine, but every time he tried to use VPN with his Cisco VPN client he’d get an error message: Secure VPN disconnected by peer, Reason Code:433 no reason from peer. As reliable as the sun, after 40 seconds the connection would drop.
We tried a ton of stuff and lost a lot of hair in the process, but what ultimately worked was resetting the MTU size on the Linksys router to 1350. Works for both wired connections, but wireless seems flaky still.

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