ASUS RT-N16 PPTP MTU unchangeable?? When I select PPTP connection in the drop down box, the MTU/MRU boxes become greyed out and I cannot input anything. If I change the connection to PPPoE, I can then change the MTU/MRU settings. Why is this? Isn't the MTU setting just as crucial for PPTP connections? I changed to PPPoE then adjusted MTU/MRU, saved, and then changed connection back to PPTP. I do not know if that did anything for it but, it seems ok so far. Can someone shed some light on this?