March 2005
Intermediate to advanced
308 pages
10h 32m
English
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Gotchas
Once a computer has IPv6 enabled it is likely to begin to find
records relevant to IPv6 in the DNS. In an ideal world, this would
cause no problems, even if the device was not connected to the IPv6
Internet. However, a bug in some DNS servers has caused then to
respond with a "host does not exist" message, rather than a "no record
of this type" message. The best known occurrence of this led to IPv6
users not being able to connect to news.bbc.co.uk unless they first looked up
its IPv4 address, although this problem has since been resolved.
Others have had problems with ad.doubleclick.net, where some of its
servers do not respond to queries for IPv6 addresses.
Native IPv6 over Ethernet uses multicast at the link-level for a number of things, and thus is sensitive to the correct operation of multicast in Ethernet drivers. There have been several reports of vendors discovering that Ethernet multicast is broken only when users complain that IPv6 does not work correctly.
The usual manifestation of this is that Neighbor Discovery behaves oddly. One way to test this is to run a tool such as tcpdump that puts the Ethernet interface into promiscuous mode. This means that the Ethernet interface examines all packets, thus working around incorrect filtering of multicast packets. If IPv6 seems to work correctly while the interface is in promiscuous mode, there's probably a multicast problem. You will need to contact your vendor for a fix.
One other confusing thing that can happen is that ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.