<html>
<head>
<meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<div class="moz-cite-prefix"><font face="Calibri">I see that WinXP
keeps the /128 for the last 32 entries.<br>
<br>
</font><tt>C:\Documents and Settings\</tt><tt><tt>Tassos</tt>>ipv6
rc</tt><tt><br>
</tt><tt>2a02:1788:4fd::b2ff:5201 via 4/fe80::218:18ff:fef6:5b54</tt><tt><br>
</tt><tt> src 4/2a02:2148:82:6000:1430:f026:c55a:b75b</tt><tt><br>
</tt><tt> PMTU 1500</tt><tt><br>
</tt><tt>2a02:1788:2fd::ab via 4/fe80::218:18ff:fef6:5b54</tt><tt><br>
</tt><tt> src 4/2a02:2148:82:6000:1430:f026:c55a:b75b</tt><tt><br>
</tt><tt> PMTU 1500</tt><tt><br>
</tt><tt>2a02:2148:2fff:ff02::3e01:2619 via
4/fe80::218:18ff:fef6:5b54</tt><tt><br>
</tt><tt> src 4/2a02:2148:82:6000:1430:f026:c55a:b75b</tt><tt><br>
</tt><tt> PMTU 1500</tt><font face="Calibri"><br>
<br>
<br>
</font><tt>C:\Documents and Settings\</tt><tt><tt>Tassos</tt>>netsh
interface ipv6 show global</tt><tt><br>
</tt><tt>Querying active state...</tt><tt><br>
</tt><tt><br>
</tt><tt>General Global Parameters</tt><tt><br>
</tt><tt>---------------------------------------------</tt><tt><br>
</tt><tt>Default Hop Limit : 128 hops</tt><tt><br>
</tt><tt>Neighbor Cache Limit : 256 entries per
interface</tt><tt><br>
</tt><tt>Route Cache Limit : 32 entries</tt><tt><br>
</tt><tt>Reassembly Limit : 16770400 bytes</tt><font
face="Calibri"><br>
<br>
<br>
Win7 seems to keep /128 for the last 128 entries.<br>
</font><tt><br>
</tt><tt>C:\Users\Tassos>netsh interface ipv6 show
destinationcache</tt><tt><br>
</tt><tt><br>
</tt><tt>Interface 10: Local Area Connection</tt><tt><br>
</tt><tt><br>
</tt><tt><br>
</tt><tt>PMTU Destination Address Next
Hop Address</tt><tt><br>
</tt><tt>---- ---------------------------------------------
-------------------------</tt><tt><br>
</tt><tt>1492 2001:0:5ef5:79fb:1c3e:d863:c447:6318
fe80::200:ff:fe00:0</tt><tt><br>
</tt><tt>1492 2001:0:9d38:6ab8:4a3:31f0:411e:6346
fe80::200:ff:fe00:0</tt><tt><br>
</tt><tt>1492 2001:0:9d38:6ab8:10c5:11cb:b08a:5623
fe80::200:ff:fe00:0</tt><tt><br>
</tt><tt>1492 2001:0:9d38:6ab8:3485:2015:a1ca:a777
fe80::200:ff:fe00:0</tt><tt><br>
</tt><tt>1492 2001:0:9d38:6abd:1cbd:1b0c:e0f1:34d3
fe80::200:ff:fe00:0</tt><tt><br>
</tt><tt>1492 2001:0:9d38:90d7:20a2:147a:9a93:4e6b
fe80::200:ff:fe00:0</tt><tt><br>
</tt><tt>1500 2a02:2149:8104:3100:4484:bf55:88d6:bcc3
2a02:2149:8104:3100:4484:bf55:88d6:bcc</tt><tt><br>
</tt><tt>1492 fe80::200:ff:fe00:0
fe80::200:ff:fe00:0</tt><tt><br>
</tt><tt>1492 2001:0:9d38:90d7:2020:3f27:a9ec:39ce
fe80::200:ff:fe00:0</tt><tt><br>
</tt><tt>1492 2001:0:5ef5:79fd:873:3f92:ac11:1ee6
fe80::200:ff:fe00:0</tt><tt><br>
</tt><tt><br>
</tt><tt>C:\Users\Tassos>netsh interface ipv6 show global</tt><tt><br>
</tt><tt>Querying active state...</tt><tt><br>
</tt><tt><br>
</tt><tt>General Global Parameters</tt><tt><br>
</tt><tt>---------------------------------------------</tt><tt><br>
</tt><tt>Default Hop Limit : 128 hops</tt><tt><br>
</tt><tt>Neighbor Cache Limit : 256 entries per
interface</tt><tt><br>
</tt><tt>Route Cache Limit : 128 entries per
compartment</tt><font face="Calibri"><br>
<br>
<br>
</font>
<pre class="moz-signature" cols="0">--
Tassos</pre>
Jason Fesler wrote on 17/10/2013 19:05:<br>
</div>
<blockquote
cite="mid:CADCiYHDvx+KG=9TmM88O=jqVzCKX+9L+PjiXiHEM2D4mhv_S+Q@mail.gmail.com"
type="cite">I'm once again considering trying to improve on the <a
moz-do-not-send="true" href="http://test-ipv6.com">test-ipv6.com</a>
PMTUD failure detection. Due to limitations on the client side I
can't use raw sockets to generate test packets. The client is
JavaScript and runs in a browser; all I can do is try fetching
urls from multiple locations, each with a different MTU.
<div>
<br>
</div>
<div>I know that the various operating systems tend to cache any
PMTUD issues that they can detect; future connections to that
destination will use smaller packets accordingly. What I can not
see to find is an adequate description of what granularity this
gets cached with. /128? /64? Also, I the absence of Packet Too
Big messages, what does each OS do?</div>
<div><br>
</div>
<div>If anyone has pointers, please share. It will affect what and
how I can improve the site, given the restrictions I have with
the client side.</div>
<div><br>
</div>
<br>
<br>
<br>
-- <br>
<div dir="ltr">
<div>
Jason Fesler, email/jabber <<a moz-do-not-send="true"
href="mailto:jfesler@gigo.com" target="_blank">jfesler@gigo.com</a>>
resume: <a moz-do-not-send="true" href="http://jfesler.com"
target="_blank">http://jfesler.com</a></div>
<div> "Give a man fire, and he'll be warm for a day;</div>
<div> set a man on fire, and he'll be warm for the rest of his
life."</div>
<div><br>
</div>
</div>
<br>
</blockquote>
<br>
</body>
</html>