Lutz.Pressler at SerNet
May 7, 2012, 7:58 AM
Views: 392
Permalink
|
|
IPv4-mapped as ICMPv6 source address ?!
|
|
Hello,
doing traceroute6 www.ietf.org, I get
[...]
5 2001:1890:1fff:109:192:205:34:181 (2001:1890:1fff:109:192:205:34:181) 95.902 ms 95.644 ms 119.383 ms
6 n54ny21crs.ipv6.att.net (2001:1890:ff:ffff:12:122:80:226) 175.058 ms 173.507 ms 176.317 ms
7 cgcil22crs.ipv6.att.net (2001:1890:ff:ffff:12:122:1:2) 171.525 ms 171.620 ms 172.789 ms
8 cr1.cgcil.ip.att.net (::ffff:12.122.2.53) 174.256 ms 174.761 ms 173.078 ms
9 sffca21crs.ipv6.att.net (2001:1890:ff:ffff:12:122:4:121) 172.066 ms 172.525 ms 174.842 ms
10 cr81.sj2ca.ip.att.net (::ffff:12.122.1.118) 171.342 ms 173.409 ms 171.158 ms
11 sj2ca401me3.ipv6.att.net (2001:1890:ff:ffff:12:122:126:238) 237.509 ms 170.582 ms 170.598 ms
[...]
and indeed see incoming ICMPv6 packets with ::ffff:/96 source addresses.
I suppose, this is not as it should be. Does anyone know what kind
of routers create those and in which situation (maybe if there are only
link-local IPv6 addresses on the link)? Probably it's not SIIT.
Lutz
|
IPv4-mapped as ICMPv6 source address ?!
