Herbert J Skuhra skrev:
>
> Eugene Grosbein skrev:
>>
>> 02.07.2017 22:11, Herbert J. Skuhra пишет:
>>> 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>
>>
>> 'set iface enable tcpmssfix' in mpd.conf should be enough for you.
>>
>> Are you sure you have it in right point of the config?
>> This is critical for it to take effect. Please see mpd.conf.sample for
>> example.
>>
>> Doesn't mpd complain of this command to its log?
>
> No.
>
>> Make sure you have 'log +iface +iface2' command in your mpd.conf,
>> restart mpd5 and scan its log for 'tcpmssfix'.
>
> 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. :-(
Hmm, adding "mtu#1440" to /etc/rtadvd.conf apperently fixes these
issues. Makes sense?
--
Herbert
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