<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, Sans-Serif;font-size:16px"><div id="yui_3_16_0_1_1429491635643_4330" dir="ltr"><span id="yui_3_16_0_1_1429491635643_4335">Given that edge routers only <b id="yui_3_16_0_1_1429491635643_4994">forward</b> traffic rather then <b id="yui_3_16_0_1_1429491635643_6639">generate</b> it (except for maybe BGP) is there any harm in having the MTU higher than 1500?</span></div><div id="yui_3_16_0_1_1429491635643_4330" dir="ltr"><span><br></span></div><div id="yui_3_16_0_1_1429491635643_4330" dir="ltr"><span id="yui_3_16_0_1_1429491635643_7459">After all in this situation it's the client and the server that actually create the packet and associated MTU. The routers in between are just forwarding?</span></div><div id="yui_3_16_0_1_1429491635643_4330" dir="ltr"><br></div><div id="yui_3_16_0_1_1429491635643_4330" dir="ltr"><br></div> <br><div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, Sans-Serif; font-size: 16px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, Sans-Serif; font-size: 16px;"> <div dir="ltr"> <font size="2" face="Arial"> On Sunday, 19 April 2015, 11:54, Nathan Brookfield <Nathan.Brookfield@simtronic.com.au> wrote:<br> </font> </div> <br><br> <div class="y_msg_container"><div id="yiv6337648200"><div>
<div>Hi James,</div>
<div><br clear="none">
</div>
<div>For anything internet facing for compatibility really and the fact that all transit providers and most peers on an exchange would be using 1500 byte MTU's we enforce this at all edges.</div>
<div><br clear="none">
</div>
<div>For customer Ethernet we enable by default at least 1998 unless requested by the end client for Jumbo's or baby Giants, this allows them to do a bit of encapsulation where required, L2TP etc without complaining to us about clamping.</div>
<div><br clear="none">
</div>
<div>For our own core network so that we can entertain 9216 at Layer 2 if requested, we ensure we provision every back haul link and interface touching these at 9000 Bytes Layer 3.<br clear="none">
<br clear="none">
<div>Kindest Regards,</div>
Nathan Brookfield
<div><br clear="none">
<div>Chief Executive Officer</div>
<div><span style="font-size:13pt;">Simtronic Technologies Pty Ltd</span></div>
<div><span style="font-size:13pt;"><br clear="none">
</span></div>
<div>Web: <a rel="nofollow" shape="rect" target="_blank" href="http://simtronic.com.au/">http://simtronic.com.au</a></div>
<div>Phone: 1300 592 330</div>
<div>Fax: (02) 4749 4950</div>
</div>
</div>
<div class="yiv6337648200yqt4784044572" id="yiv6337648200yqt49471"><div><br clear="none">
On 19 Apr 2015, at 10:54, James Mcintosh <<a rel="nofollow" shape="rect" ymailto="mailto:james.mcintosh@rocketmail.com" target="_blank" href="mailto:james.mcintosh@rocketmail.com">james.mcintosh@rocketmail.com</a>> wrote:<br clear="none">
<br clear="none">
</div>
<div>
<div style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, Sans-Serif;font-size:16px;">
<div dir="ltr" id="yiv6337648200yui_3_16_0_1_1429404584935_3026">Hey Noggers,</div>
<div dir="ltr" id="yiv6337648200yui_3_16_0_1_1429404584935_3026"><br clear="none">
</div>
<div dir="ltr" id="yiv6337648200yui_3_16_0_1_1429404584935_3026">With router MTU's being configurable up to a whopping 9216 what are people setting for their interface MTU's on internet connected core and PE routers?</div>
<div dir="ltr" id="yiv6337648200yui_3_16_0_1_1429404584935_3026"><br clear="none">
</div>
<div dir="ltr" id="yiv6337648200yui_3_16_0_1_1429404584935_3026">Is it is still just the default of 1500?</div>
<div class="yiv6337648200" dir="ltr" id="yiv6337648200yui_3_16_0_1_1429404584935_3026" style=""> </div>
<div class="yiv6337648200" dir="ltr" id="yiv6337648200yui_3_16_0_1_1429404584935_3026" style="">What about core switches? What are you setting there to get get interoperability with various ethernet providers?</div>
<div class="yiv6337648200" dir="ltr" id="yiv6337648200yui_3_16_0_1_1429404584935_3026" style=""><br clear="none">
</div>
<div class="yiv6337648200" dir="ltr" id="yiv6337648200yui_3_16_0_1_1429404584935_3026" style=""><br clear="none">
</div>
<div class="yiv6337648200" dir="ltr" id="yiv6337648200yui_3_16_0_1_1429404584935_3026" style="">-James</div>
</div>
</div></div>
<div><span>_______________________________________________</span><br clear="none">
<span>AusNOG mailing list</span><br clear="none">
<span><a rel="nofollow" shape="rect" ymailto="mailto:AusNOG@lists.ausnog.net" target="_blank" href="mailto:AusNOG@lists.ausnog.net">AusNOG@lists.ausnog.net</a></span><br clear="none">
<span><a rel="nofollow" shape="rect" target="_blank" href="http://lists.ausnog.net/mailman/listinfo/ausnog">http://lists.ausnog.net/mailman/listinfo/ausnog</a></span><br clear="none">
</div>
</div></div><br><br></div> </div> </div> </div></div></body></html>