<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Aug 8, 2017 at 4:50 PM, Fabrice Bacchella <span dir="ltr"><<a href="mailto:fabrice.bacchella@orange.fr" target="_blank">fabrice.bacchella@orange.fr</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><br><div><blockquote type="cite"><div>Le 8 août 2017 à 14:53, Moacir Ferreira <<a href="mailto:moacirferreira@hotmail.com" target="_blank">moacirferreira@hotmail.com</a>> a écrit :</div><br class="m_-509149251004553640Apple-interchange-newline"><div><div id="m_-509149251004553640divtagdefaultwrapper" dir="ltr" style="font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-size:12pt;font-family:Calibri,Helvetica,sans-serif"><div style="margin-top:0px;margin-bottom:0px">But if you receive a 9000 MTU frame on an "input" interface that results sending it out on an interface of a 1500 MTU, then if you set DF bit the frame will just be dropped by the router.</div></div></div></blockquote><br></div>The frame will be dropped and the router will send an ICMP message "packet to big" to the sender, it's network stack will received that, learn that the PMTU is lower and try with smaller fragment, see <a href="https://en.wikipedia.org/wiki/Path_MTU_Discovery" target="_blank">https://en.wikipedia.org/<wbr>wiki/Path_MTU_Discovery</a>.</div></blockquote><div><br></div><div>If they are allowed to cross and are not dropped by a firewall in the middle... But I believe we are a bit far from the original discussion.</div><div>Y.</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><div><br></div></div><br>______________________________<wbr>_________________<br>
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