Date: Sun, 02 Jul 2017 17:11:56 +0200 From: "Herbert J. Skuhra" <herbert@mailbox.org> To: Eugene Grosbein <eugen@grosbein.net> Cc: 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: <87a84myitf.wl-herbert@mailbox.org> In-Reply-To: <59590064.1040700@grosbein.net> 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> <59590064.1040700@grosbein.net>
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Eugene Grosbein skrev:
>
> 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.
ng0: flags=88d1<UP,POINTOPOINT,RUNNING,NOARP,SIMPLEX,MULTICAST> metric 0 mtu 1440
inet6 fe80::XXX:XXXX:XXXX:XXXX%ng0 prefixlen 64 scopeid 0x7
inet XX.XX.XX.XX --> XX.XX.XX.YY netmask 0xffffffff
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
--
Herbert
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