I went to setup a quick PPTP (just faster to use this broken VPN vs the OpenVPN as this doesn't need to be a real secure link). When I tried to tab past the MTU and MRU fields, the router popped up with a message that reads "Port value is out of range [1-65535]" (even though it's not the port you're setting and there's already a default listed beside the box)
I can confirm that this doesn't happen with an older stock DD-WRT v24-SP2 on an older Linksys WRT-150N
Anyone else have this issue?