<div dir="ltr">I've already got a list using tcpdump -e. The list is about ~50 ASNs.<div><br></div><div>Will write a script later to contact them later today.</div><div><br></div><div>:-)</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Mar 6, 2019 at 12:38 AM Rubens Kuhl <<a href="mailto:rubensk@gmail.com">rubensk@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Mar 5, 2019 at 12:13 PM Siyuan Miao <<a href="mailto:siyuan@misaka.io" target="_blank">siyuan@misaka.io</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr">Hi,<div><br></div><div>We enabled two NTP servers earlier today in our Brazil site and observed some traffic from 172.16/12 towards our NTP servers.</div><div><br></div><div><div><font face="monospace, monospace">08:11:20.824080 d8:18:d3:14:07:f1 > a4:5d:36:11:b8:7d, ethertype IPv4 (0x0800), length 90: 172.25.15.102.56369 > 185.184.223.223.123: NTPv3, Client, length 48</font></div><div><font face="monospace, monospace">08:11:21.585601 40:55:39:64:4a:41 > a4:5d:36:11:b8:7d, ethertype IPv4 (0x0800), length 90: 172.26.0.10.51779 > 185.184.223.223.123: NTPv3, Client, length 48</font></div><div><font face="monospace, monospace">08:11:21.640335 9c:7d:a3:ee:bf:a0 > a4:5d:36:11:b8:7d, ethertype IPv4 (0x0800), length 90: 172.20.1.142.56857 > 185.184.223.223.123: NTPv3, Client, length 48</font></div><div><font face="monospace, monospace">08:11:21.933465 5c:5e:ab:db:6f:60 > a4:5d:36:11:b8:7d, ethertype IPv4 (0x0800), length 90: 172.19.10.88.43774 > 185.184.223.224.123: NTPv3, Client, length 48</font></div></div><div><br></div></div></div></blockquote><div><br></div><div>Step 1: see your ARP table to identify MAC to IP address relation. You might want to do a broadcast ping to gather some. </div><div>Step 2: Use <a href="http://meu.ix.br" target="_blank">meu.ix.br</a> list of participant contacts to warn them they are announcing the IX network into their interior routing, so they should either not do it or filter traffic. </div><div>Step 3: For unresponsive networks, add communities to prevent propagation of your announcement to them. </div><div><br></div><div><br></div><div>Rubens</div><div> </div></div></div>
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