Page 1 of 1

IPv6 MTU issues again?

Posted: Mon Sep 02, 2019 11:13 pm
by badmtu
Some sites have been loading very poorly if I leave IPv6 enabled in Firefox.

Netflix is the main example. Takes minutes to load the page, usually stalling on a TLS connection to

If I disable IPv6 in about:config, it loads instantly. This happened like a year ago due to some MTU issue and was resolved with some changes on Sonic's side.

Another example site: which is loaded when visiting this page for example:

For whatever reason, Chrome doesn't seem to be as affected.

Re: IPv6 MTU issues again?

Posted: Fri Sep 06, 2019 5:24 pm
by badmtu
Still experiencing this issue. I forgot to mention this is on Fusion X2. It's frustrating having to disable IPv6 every time I want to watch Netflix.

Here is the thread I referenced.

The symptoms are quite similar although I'm not sure if it's cloudflare again this time.