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--></style></head><body lang=ES link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>6to4 is still a valid protocol. IT SHOULD NOT be filtered. 6to4 uses the same protocol as other tunnels such as 6in4 (protocol 41).<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><a href="https://www.ietf.org/rfc/rfc3056.txt"><span lang=EN-US>https://www.ietf.org/rfc/rfc3056.txt</span></a><span lang=EN-US style='font-size:11.0pt'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>It works fine for peer to peer applications.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>What the IETF deprecated is anycast for 6to4 relays:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><a href="https://tools.ietf.org/html/rfc7526"><span lang=EN-US>https://tools.ietf.org/html/rfc7526</span></a><span lang=EN-US style='font-size:11.0pt'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>I believe Hurricane Electric still hosts 6to4 relays.<o:p></o:p></span></p><div><p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;color:black'><br>Regards,<o:p></o:p></span></p><p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US style='font-size:10.5pt;color:black;mso-fareast-language:EN-US'>Jordi<o:p></o:p></span></p><p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US style='font-size:10.5pt;color:black;mso-fareast-language:EN-US'><o:p> </o:p></span></p></div><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><div><div><p class=MsoNormal style='margin-left:35.4pt'>El 14/5/19 17:25, "Amos Rosenboim" <<a href="mailto:ipv6-ops-bounces+jordi.palet=consulintel.es@lists.cluenet.de">ipv6-ops-bounces+jordi.palet=consulintel.es@lists.cluenet.de</a> en nombre de <a href="mailto:amos@oasis-tech.net">amos@oasis-tech.net</a>> escribió:<span style='font-size:11.0pt'><o:p></o:p></span></p></div></div><div><p class=MsoNormal style='margin-left:35.4pt'><o:p> </o:p></p></div><p class=MsoNormal style='margin-left:35.4pt'><span style='font-size:11.0pt'>Hello,</span><o:p></o:p></p><p class=MsoNormal style='margin-left:35.4pt'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:35.4pt'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:35.4pt'><span style='font-size:11.0pt'>As we are trying to tighten the security for IPv6 traffic in our network, I was looking for a reference IPv6 ingress filter.</span><o:p></o:p></p><p class=MsoNormal style='margin-left:35.4pt'><span style='font-size:11.0pt'>I came up with Job Snijders suggestion (thank you Job) that can be conveniently found at whois -h whois.ripe.net fltr-martian-v6</span><o:p></o:p></p><p class=MsoNormal style='margin-left:35.4pt'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:35.4pt'><span style='font-size:11.0pt'>After applying the filter I noticed some traffic from 6to4 addresses (2002::/16) to our native IPv6 prefixes (residential users in this case).</span><o:p></o:p></p><p class=MsoNormal style='margin-left:35.4pt'><span style='font-size:11.0pt'>The traffic is a mix of both UDP and TCP but all on high port numbers on both destination and source.</span><o:p></o:p></p><p class=MsoNormal style='margin-left:35.4pt'><span style='font-size:11.0pt'>It seems to me like some P2P traffic, but I really can’t tell.</span><o:p></o:p></p><p class=MsoNormal style='margin-left:35.4pt'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:35.4pt'><span style='font-size:11.0pt'>This got me thinking, why should we filter these addresses at all ?</span><o:p></o:p></p><p class=MsoNormal style='margin-left:35.4pt'><span style='font-size:11.0pt'>I know 6to4 is mostly dead, but is it inherently bad ?</span><o:p></o:p></p><p class=MsoNormal style='margin-left:35.4pt'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:35.4pt'><span style='font-size:11.0pt'>And if so, why is the prefix (2002::/16) still being routed ?</span><o:p></o:p></p><p class=MsoNormal style='margin-left:35.4pt'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:35.4pt'><span style='font-size:11.0pt'>Thanks,</span><o:p></o:p></p><p class=MsoNormal style='margin-left:35.4pt'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:35.4pt'><span style='font-size:11.0pt'>Amos Rosenboim</span><o:p></o:p></p><p class=MsoNormal style='margin-left:35.4pt'><span style='font-size:11.0pt'>-- </span><o:p></o:p></p><p class=MsoNormal style='margin-left:35.4pt'> <o:p></o:p></p></div><br>**********************************************<br>
IPv4 is over<br>
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