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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Tom, how exactly does someone “ride the 0/0” train in the DFZ?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">I’m connected to both commercial internet and NREN, and unfortunately-long paths are not uncommon in this scenario, in order to do traffic steering. If there’s another solution that affects global
<i>inbound</i> traffic distributions, I’d love to hear about it (and so would a lot of my peers in edu).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">If there were a usable way to “dump” the excessively-long path only as long as a better path was already known by at least one edge router, that might be workable, but you’d have to keep track of
it somewhere to reinstall it if the primary route went away… at which point you may as well have not dropped it in the first place.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">-Adam<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;color:#44546A;background:white">Adam Thompson</span></b><span style="font-size:9.0pt;color:#44546A;background:white"><br>
Consultant, Infrastructure Services<br>
<img width="128" height="39" style="width:1.3333in;height:.4083in" id="Picture_x0020_1" src="cid:image001.png@01D84068.83E50370" alt="MERLIN"><br>
100 - 135 Innovation Drive<br>
Winnipeg, MB, R3T 6A8<br>
(204) 977-6824 or 1-800-430-6404 (MB only)<br>
<a href="mailto:athompson@merlin.mb.ca" target="_blank">athompson@merlin.mb.ca</a><br>
<a href="http://www.merlin.mb.ca/" target="_blank">www.merlin.mb.ca</a></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> NANOG <nanog-bounces+athompson=merlin.mb.ca@nanog.org>
<b>On Behalf Of </b>Tom Beecher<br>
<b>Sent:</b> Friday, March 25, 2022 4:13 PM<br>
<b>To:</b> Paschal Masha <paschal.masha@ke.wananchi.com><br>
<b>Cc:</b> nanog <nanog@nanog.org><br>
<b>Subject:</b> Re: DMARC ViolationAS21299 - 46.42.196.0/24 ASN prepending 255 times<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">The best practice with regards to as_path length is to have an edge filter that dumps any prefix with a length longer than say 10. Depending on the situation, might even be able to go smaller. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">At a certain point, keeping that route around does nothing for you, just shoot it and ride the 0/0 train. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Fri, Mar 25, 2022 at 4:09 AM Paschal Masha <<a href="mailto:paschal.masha@ke.wananchi.com">paschal.masha@ke.wananchi.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">:) probably the longest prepend in the world.<br>
<br>
A thought though, is it breaking any standard or best practice procedures?<br>
<br>
Regards <br>
Paschal Masha | Engineering <br>
Skype ID: paschal.masha<br>
<br>
----- Original Message -----<br>
From: "Erik Sundberg" <<a href="mailto:ESundberg@nitelusa.com" target="_blank">ESundberg@nitelusa.com</a>><br>
To: "nanog" <<a href="mailto:nanog@nanog.org" target="_blank">nanog@nanog.org</a>><br>
Sent: Friday, March 25, 2022 6:43:38 AM<br>
Subject: DMARC ViolationAS21299 - <a href="http://46.42.196.0/24" target="_blank">
46.42.196.0/24</a> ASN prepending 255 times<br>
<br>
If anyone from AS21299 is lurking on Nanog. Please reduce your AS prepends for <a href="http://46.42.196.0/24" target="_blank">
46.42.196.0/24</a> from 255 prepends to a more reasonable number of prepends let's say 20. Thanks!
<br>
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This is a Kazakhstan register IP Block and ASN <br>
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Network Next Hop Metric LocPrf Weight Path <br>
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*> <a href="http://46.42.196.0/24" target="_blank">46.42.196.0/24</a> x.x.x.x 0 100 0 2914 174 3216 3216 35168 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299
21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299
21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299
21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299
21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299
21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299
21299 21 299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 21299 i
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Thank you. <br>
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<br>
<o:p></o:p></p>
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