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Thanks for the input Juergen ... it's good to get feedback from the
"real world".<br>
<br>
I will note that, in Cisco Unified Wireless, our access points can
perform MSS adust ... and, starting in the 8.5 release later this
year, we will set it to 1250 by default. (On the theory that that
should work well in virtually all topologies, with minimal
performance degradation vs. an MSS of say 1400.)<br>
<br>
Cheers,<br>
<br>
Aaron<br>
<br>
<hr size="2" width="100%"><br>
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font-size:12px; font-weight:normal">
<div class="moz-cite-prefix">On 6/9/2017 12:02 AM,
<a class="moz-txt-link-abbreviated" href="mailto:cnsp@marenda.net">cnsp@marenda.net</a> (Juergen Marenda) wrote:<br>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Remember to set it on both/all interfaces, WANs
and LANs <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">(don't know weather it’s a bug or feature, but
it helped).<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">I tend to use (very conservative) 2**10+2**8 =
1280 since that fits most environments <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">(L2TP relayed PPPoE Broadband access with IPsec
Tunnel for example)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">and is a “well known” value cause of display
resolutions ;-)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">I don’t set it in the core, only on edge and
CPEs since the core <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">should not be loaded with traffic inspection or
tcp-handshake-interaction<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">but forward packets fast.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">My 0.01 $,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Juergen.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<div>
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1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">Von:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
cisco-nas [<a class="moz-txt-link-freetext" href="mailto:cisco-nas-bounces@puck.nether.net">mailto:cisco-nas-bounces@puck.nether.net</a>] <b>Im
Auftrag von </b>Aaron Leonard<br>
<b>Gesendet:</b> Freitag, 9. Juni 2017 00:16<br>
<b>An:</b> Joseph Mays; <a class="moz-txt-link-abbreviated" href="mailto:cisco-nas@puck.nether.net">cisco-nas@puck.nether.net</a><br>
<b>Betreff:</b> Re: [cisco-nas] Windows 10 with AS5400<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif"">Joseph,<br>
<br>
As a matter of course, I always just set adjust-mss to
1300 (or whatever my fancy is that day) on all edge
routers, i.e. the routers that are clients' first-hop
gateways.<br>
<br>
You might not want to set it on your more core routers,
because this could impact performance. (On the other
hand, it might benefit performance, if it allows you to
avoid doing fragmentation [and even worse, reassembly, if
your routers are tunnel endpoints that do that sort of
thing.])<br>
<br>
Now, if you <b>only</b> see this problem on your dialup
clients, then I suppose you could be conservative and set
it only on your 5400s. But I can tell you that I
absolutely see this problem affecting Windows 10 Creators
Update clients in other topologies (e.g. Wi-Fi, which is
my bailiwick nowadays.)<br>
<br>
Best regards,<br>
<br>
Aaron<o:p></o:p></span></p>
<div class="MsoNormal" style="text-align:center"
align="center"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif"">
<hr size="2" align="center" width="100%"></span></div>
<p class="MsoNormal"><span class="headerspan"><span
style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black"><o:p> </o:p></span></span></p>
<div>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">On
6/8/2017 2:46 PM, <a href="mailto:mays@win.net"
moz-do-not-send="true">mays@win.net</a> (Joseph Mays)
wrote:</span><o:p></o:p></p>
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<div>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:black">I
meant to say they are all cisco routers.<o:p></o:p></span></p>
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<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"> <o:p></o:p></span></p>
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<p class="MsoNormal"
style="background:whitesmoke"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">
Joseph Mays <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"
style="background:whitesmoke"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">Sent:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">
Thursday, June 08, 2017 3:46 PM<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"
style="background:whitesmoke"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"
lang="EN-US">To:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"
lang="EN-US"> </span><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"><a
href="mailto:cisco-nas@puck.nether.net"
moz-do-not-send="true"><span
lang="EN-US">cisco-nas@puck.nether.net</span></a></span><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">
<span lang="EN-US"><o:p></o:p></span></span></p>
</div>
<div>
<p class="MsoNormal"
style="background:whitesmoke"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">Subject:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">
Re: [cisco-nas] Windows 10 with AS5400<o:p></o:p></span></p>
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</div>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:black"> <o:p></o:p></span></p>
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<div>
<div>
<div>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:black">Thanks
for the response! Trying all the
client-side suggestions. WRT this,
though...<o:p></o:p></span></p>
</div>
<div>
<ul type="disc">
<li class="MsoNormal"
style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0
level1 lfo1"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif"">on
the infrastructure side, if a router
in the affected network path is a
Cisco IOS router, then turn on TCP MSS
Adjust (set it to 1250 or 1360 or so.)
<o:p></o:p></span></li>
</ul>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:black">All
the routers in the network path on our
system are network routers. Are you
suggesting I turn this on for all of
them, or just on the AS5400 that answers
the dialup connection?</span><span
style="font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
</div>
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align="center"><span
style="font-family:"Calibri","sans-serif";color:black">
<hr size="2" align="center" width="100%"></span></div>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:black">_______________________________________________<br>
cisco-nas mailing list<br>
<a href="mailto:cisco-nas@puck.nether.net"
moz-do-not-send="true">cisco-nas@puck.nether.net</a><br>
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href="https://puck.nether.net/mailman/listinfo/cisco-nas"
moz-do-not-send="true">https://puck.nether.net/mailman/listinfo/cisco-nas</a><o:p></o:p></span></p>
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style="font-size:10.0pt;font-family:"Verdana","sans-serif""><br>
<br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>cisco-nas mailing list<o:p></o:p></pre>
<pre><a href="mailto:cisco-nas@puck.nether.net" moz-do-not-send="true">cisco-nas@puck.nether.net</a><o:p></o:p></pre>
<pre><a href="https://puck.nether.net/mailman/listinfo/cisco-nas" moz-do-not-send="true">https://puck.nether.net/mailman/listinfo/cisco-nas</a><o:p></o:p></pre>
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<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana","sans-serif""><o:p> </o:p></span></p>
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