[Bug 220351] Path MTU discovery works only after resetting an internal interface MTU (mpd5, ng_nat, ipfw)

Tue Jul 4 17:34:58 UTC 2017

02.07.2017 23:57, Herbert J. Skuhra wrote:

> mpd: [B1] IFACE: Connecting tcpmssfix
> 
> But when I disable IPv6 on my network everything is working... even
> without tcpmssfix enabled.
> 
> Instead of enabling ipv6cp in mpd5 I've also tested with an IPv6 tunnel
> from HE... same issue. :-(

I do not think this is mpd5-centric issue, rather IPv6-centric.