Date: Sun, 2 Jul 2017 21:17:08 +0700 From: Eugene Grosbein <eugen@grosbein.net> To: "Herbert J. Skuhra" <herbert@mailbox.org>, 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: <59590064.1040700@grosbein.net> In-Reply-To: <87bmp3x7eu.wl-herbert@mailbox.org> References: <bug-220351-2472@https.bugs.freebsd.org/bugzilla/> <bug-220351-2472-lCDWr8PCgb@https.bugs.freebsd.org/bugzilla/> <87r2xzaw30.wl-herbert@mailbox.org> <87bmp3x7eu.wl-herbert@mailbox.org>
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02.07.2017 21:03, Herbert J. Skuhra wrote:
> Skype for Business (S4B) on Mac OS X 10.12.6 (Beta5) is actually
> trying to connect over IPv4. The connection fails until I lower MTU to
> 1440. After resetting MTU to 1500 and restarting S4B it connects fine
> for a while ('route -n get' default shows 1500). I use 'set iface
> enable tcpmssfix' in mpd5.conf and I've tried:
>
> - set iface mtu and set link mtu/mru/mrru in mpd5.conf
> - set scrub ... max-mss in pf.conf
Please show output of ifconfig command for external ng interface.
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