IPv6 Fragmentation

Bill Cerveny of Arbor Networks has a great post on IPv6 Fragmentation. It works a bit differently in IPv6 from IPv4 and it’s a very important difference. This is especially true when considering how to implement a security policy. Fragmentation is one of the few uses of IPv6 extension headers seen regularly in the wild today and must use Path-MTU to work effectively.

A Short Bit of Post World IPv6 Day Analysis

Both the European exchange points providing IPv6-specific traffic reports showed an increase in IPv6 traffic on World IPv6 Day. AMS-IX showed a a small increase (peaking at 2.9Gbs), but may not be statiscally significant. Based on looking at the year-to-date IPv6 traffic, it looks like the jump in IPv6 traffic started in February 2011 with an increase in peak usage from around 1.8Gbs to around 2.6Gbs. That roughly matches up with the time of the IANA IPv4 free pool exhaustion. DE-IX showed a marked increase in traffic appearing to at lease double its previous reports. It seems clear the community that used DE-IX was using the day to learn more about IPv6.

Ars Technical offers this summary.