Many sites do not work (with an empty response or no data error). These include Verizon itself, Paypal, and some others.
Lowering MTU to 576 "fixes" the problem for now, but I would like to raise it back to 1492. Tried calling support several times, but never got past the first couple of support level questionings about my modem, OS etc. None of the support people understood what I am talking about, why am I calling if I am able to connect and why rebooting the modem or my laptop (!) will not help.
The problem is clearly between my modem and the internet somewhere, probably the local CO in Tannersville NY.
The account number in question is {edited for privacy}. I am hoping that someone at Verizon reads this and can solicit competent help.