<div dir="ltr"><div>On Thu, Jan 17, 2013 at 7:01 PM, Sam Wilson <span dir="ltr"><<a href="mailto:Sam.Wilson@ed.ac.uk" target="_blank">Sam.Wilson@ed.ac.uk</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>No, there's another way to get around it: lower the LAN MTU so the host lowers the MSS itself.<br>
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The solution is to mandate the same MTU on every link. I'm not serious about that but it looks like the obvious direction that one side of this argument is going.</blockquote><div><br></div><div>Not saying this is a good outcome, bear in mind that's effectively what we do in IPv4. In IPv4, PMTUD is basically useless and the only tools we have are MSS rewriting and "sending smaller packets". Pick some well-known content providers and you might see they don't send you 1500-byte packets in IPv4 either.</div>
<div><br></div><div style>Hopefully we can do better than that in IPv6. Who knows.</div>
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