<div dir="ltr"><div><div>If your CE and your SP both support RFC 4638, you should be able to manage an MTU of 1500 and avoid all fragmentation by configuring:<br><br>pppoe-client ppp-max-payload 1500<br><br></div><div>As described in:<br><br><a href="http://www.cisco.com/en/US/docs/ios/bbdsl/configuration/guide/bba_ppoe_client.pdf">http://www.cisco.com/en/US/docs/ios/bbdsl/configuration/guide/bba_ppoe_client.pdf</a><br></div><div><br></div>Kind regards<br><br></div>Paul Wilkins<br></div><div class="gmail_extra"><br><div class="gmail_quote">On 2 August 2016 at 21:42, Burt Mascareigne <span dir="ltr"><<a href="mailto:Burt@stormnetwork.com.au" target="_blank">Burt@stormnetwork.com.au</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">Hi,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">We have client’s that have this constant problem. I tweak the MTU to 1400 sometimes… and then everyone works magically. 1492 causes
havoc. I once set It to 1500, and it worked.. Don’t ask.. I took it to 1450 (I think) didn’t dare leave it on 1500 for ADSL.
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">We’ve moved away from Cisco to SOPHOS, and there’s no mss-adjust. We use a TD-8817 in bridge mode. We have tried other bridge
modems, no difference. <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">What’s people recommendation for us non – cisco souls? Is it the bridge causing this? Don’t see how, it’s dialler level. Unless
I’m being blond for something obvious.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext"><u></u> <u></u></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif" lang="EN-US">Regards,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif" lang="EN-US"> <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif" lang="EN-US">Burt Mascareigne<br>
Mobile</span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif" lang="EN-US"> 0414 450 962 <b>Office</b> (02) 9965 5422<br>
<b>Address</b> Level 19, 1 O’Connell Street, Sydney NSW 2000<br>
<b>Web</b> <a href="http://www.stormnetwork.com.au/" target="_blank"><span style="color:#1f497d">http://www.stormnetwork.com.au</span></a></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif" lang="EN-US"><u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext"><u></u> <u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext" lang="EN-US">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext" lang="EN-US"> AusNOG [<a href="mailto:ausnog-bounces@lists.ausnog.net" target="_blank">mailto:ausnog-bounces@lists.ausnog.net</a>]
<b>On Behalf Of </b>Shane Short<br>
<b>Sent:</b> Tuesday, 2 August 2016 8:03 PM<br>
<b>To:</b> Adam Baxter <<a href="mailto:adam1984@gmail.com" target="_blank">adam1984@gmail.com</a>><br>
<b>Cc:</b> <a href="mailto:AusNOG@lists.ausnog.net" target="_blank">AusNOG@lists.ausnog.net</a><br>
<b>Subject:</b> Re: [AusNOG] Telstra ADSL MTU<u></u><u></u></span></p>
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</div><div><div class="h5">
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Is there a particular reason you're running 1452 on the dialer? Was it a troubleshooting step, or?<br>
<br>
Adam Baxter wrote:<u></u><u></u></p>
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<p class="MsoNormal">Thank you!<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">On 2 August 2016 at 15:39, Nathan Brookfield <<a href="mailto:Nathan.Brookfield@simtronic.com.au" target="_blank">Nathan.Brookfield@simtronic.com.au</a>> wrote:<u></u><u></u></p>
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<p style="background:white"><span style="font-family:"Calibri",sans-serif">Hi Adam,<u></u><u></u></span></p>
<p style="background:white"><span style="font-family:"Calibri",sans-serif"><u></u> <u></u></span></p>
<p style="background:white"><span style="font-family:"Calibri",sans-serif">As a rule your mss-adjust should be 40 bytes lower than your actual MTU. In theory you should have 1492 on the dialer and and an mss-adjust of 1452 on the LAN interface.<u></u><u></u></span></p>
<p style="background:white"><span style="font-family:"Calibri",sans-serif"><u></u> <u></u></span></p>
<p style="background:white"><span style="font-family:"Calibri",sans-serif">If you're going to keep 1452 on the Dialer as the MTU you should adjust the mss appropriately. See if that helps at all.<u></u><u></u></span></p>
<p style="background:white"><span style="font-family:"Calibri",sans-serif"><u></u> <u></u></span></p>
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<p style="margin:0cm;margin-bottom:.0001pt;background:white"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Kindest Regards,</span><span style="color:#212121"><u></u><u></u></span></p>
<p style="margin:0cm;margin-bottom:.0001pt;background:white"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#365f91">Nathan Brookfield (VK2NAB)</span><span style="color:#212121"><u></u><u></u></span></p>
<p style="margin:0cm;margin-bottom:.0001pt;background:white"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#365f91"> </span><span style="color:#212121"><u></u><u></u></span></p>
<p style="margin:0cm;margin-bottom:.0001pt;background:white"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#365f91">Chief Executive Officer</span><span style="color:#212121"><u></u><u></u></span></p>
<p style="margin:0cm;margin-bottom:.0001pt;background:white"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#365f91">Simtronic Technologies Pty Ltd</span><span style="color:#212121"><u></u><u></u></span></p>
<p style="margin:0cm;margin-bottom:.0001pt;background:white"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#365f91"> </span><span style="color:#212121"><u></u><u></u></span></p>
<p style="margin:0cm;margin-bottom:.0001pt;background:white"><b><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#365f91">Local:</span></b><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#365f91"> (02) 4749 4949 <b>|</b> <b>Fax:</b> (02)
4749 4950 <b>|</b> <b>Direct:</b> (02) 4749 4951</span><span style="color:#212121"><u></u><u></u></span></p>
<p style="margin:0cm;margin-bottom:.0001pt;background:white"><b><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#365f91">Web</span></b><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#365f91">: <a href="http://www.simtronic.com.au/" target="_blank"><span style="color:#365f91">http://www.simtronic.com.au</span></a> <b>|</b> <b>E-mail</b>: <a href="mailto:nathan.brookfield@simtronic.com.au" target="_blank"><span style="color:#365f91">nathan.brookfield@simtronic.com.au</span></a></span><span style="color:#212121"><u></u><u></u></span></p>
<p style="margin:0cm;margin-bottom:.0001pt;background:white"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#365f91"> </span><span style="color:#212121"><u></u><u></u></span></p>
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<p class="MsoNormal" style="background:white"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> AusNOG <<a href="mailto:ausnog-bounces@lists.ausnog.net" target="_blank">ausnog-bounces@lists.ausnog.net</a>>
on behalf of Adam Baxter <<a href="mailto:adam1984@gmail.com" target="_blank">adam1984@gmail.com</a>><br>
<b>Sent:</b> Tuesday, 2 August 2016 3:35 PM<br>
<b>To:</b> <a href="mailto:AusNOG@lists.ausnog.net" target="_blank">AusNOG@lists.ausnog.net</a><br>
<b>Subject:</b> [AusNOG] Telstra ADSL MTU</span><span style="font-family:"Calibri",sans-serif">
<u></u><u></u></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Calibri",sans-serif"> <u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span style="font-family:"Calibri",sans-serif">Hi All,<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span style="font-family:"Calibri",sans-serif">I have had 2 Customers in the last few weeks that have had MTU problems. This is my Dialer interface.<br>
<br>
interface Dialer0<br>
ip address negotiated<br>
no ip redirects<br>
no ip unreachables<br>
no ip proxy-arp<br>
ip mtu 1452<br>
ip nat outside<br>
ip virtual-reassembly<br>
encapsulation ppp<br>
load-interval 30<br>
dialer pool 1<br>
dialer-group 1<br>
no cdp enable<br>
ppp authentication chap callin<br>
ppp chap hostname <a href="mailto:xxxx@direct.telstra.net" target="_blank">xxxx@direct.telstra.net</a><br>
ppp chap password 7 xxxxx<br>
end<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span style="font-family:"Calibri",sans-serif"> I have never had any problems accessing websites until the last few weeks. Does anyone know what might have changed at the Telstra end? I had
to set "ip tcp adjust-mss 1452" on the Dialer interface to make it work. Never had to in the past with a number of other connections. Perhaps I should have all along?<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span style="font-family:"Calibri",sans-serif">Regards,<u></u><u></u></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Calibri",sans-serif">Adam.<u></u><u></u></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Calibri",sans-serif"><u></u> <u></u></span></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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