<div dir="ltr"><div class="gmail_default" style>On Tue, Jan 15, 2013 at 5:04 PM, Tore Anderson <span dir="ltr"><<a href="mailto:tore@fud.no" target="_blank">tore@fud.no</a>></span> wrote:<br></div><div class="gmail_extra">
<div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">> With TCP the client advertised MSS will be derived from the IPv6 MTU,<br>
> so the server will never send 1500 byte packets on TCP.<br>
<br>
</div>So the RA LAN MTU trick really only helps TCP, correct? What is gained<br>
from lowering the LAN MTU by means of RA, rather than rewriting the TCP<br>
MSS field as we've "always" done in IPv4?<br></blockquote><div><br></div><div style>It will also give the the host information that it can use to avoid IPv6-layer fragmentation for UDP packets. Given data showing that IPv6-layer fragmentation fails a very significant percentage of the time, this is helpful.</div>
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