Date: Sun, 02 Jul 2017 13:59:15 +0200 From: "Herbert J. Skuhra" <herbert@mailbox.org> To: freebsd-net@FreeBSD.org Subject: Re: [Bug 220351] Path MTU discovery works only after resetting an internal interface MTU (mpd5, ng_nat, ipfw) Message-ID: <87r2xzaw30.wl-herbert@mailbox.org> In-Reply-To: <bug-220351-2472-lCDWr8PCgb@https.bugs.freebsd.org/bugzilla/> References: <bug-220351-2472@https.bugs.freebsd.org/bugzilla/> <bug-220351-2472-lCDWr8PCgb@https.bugs.freebsd.org/bugzilla/>
next in thread | previous in thread | raw e-mail | index | archive | help
bugzilla-noreply skrev: > > https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220351 > Eugene Grosbein <eugen@freebsd.org> changed: > > What |Removed |Added > ---------------------------------------------------------------------------- > Assignee|freebsd-net@FreeBSD.org |eugen@freebsd.org > Status|New |Open > CC| |eugen@freebsd.org > > --- Comment #2 from Eugene Grosbein <eugen@freebsd.org> --- > (In reply to Martin Birgmeier from comment #1) > > Lowering interface MTU of internal machine also lowers its default route 'mtu' > attribute, see output of the command 'route -n get default'. > > Raising interface MTU back does NOT restore 'mtu' attribute of the default > route, so the kernel still uses 1492 as maximum IP packet size for packets > going via this route. > > Correct solution for your problem is 'set iface enable tcpmssfix' command in > the mpd.conf, see /usr/local/etc/mpd5/mpd.conf.sample for example. This way you > can keep default MTU=1500 for internal hosts and have no MTU-related network > problems. > > Please test and report back. I think I have a similar problem, but with IPv6 and pf! :-( - Problem to load e.g. https://www.heise.de on the first try - Can not connect to Skype for Business over IPv6 (unfortunately I sometimes need it for job) Everything else is obviously working. Does anyone know how to fix this? Thanks. -- Herbert
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?87r2xzaw30.wl-herbert>