Hi Then I won't use this ipv6 address 2001:db8:cafe:1111::12 for test Acutually, I have one in eth0 when I run ifconfig -a inet6 addr: fe80::20c:29ff:fe3c:92a1/64 Scope:Link but I also can't ping it ping6 fe80::20c:29ff:fe3c:92a1 connect: Invalid argument but ping6 ::1 is fine ping6 ::1 PING ::1(::1) 56 data bytes 64 bytes from ::1: icmp_seq=0 ttl=64 time=7.18 ms 64 bytes from ::1: icmp_seq=1 ttl=64 time=0.050 ms --- On Wed, 3/9/11, Karl Auer <kauer@biplane.com.au> wrote:
From: Karl Auer <kauer@biplane.com.au> Subject: Re: ipv6 question To: nanog@nanog.org Received: Wednesday, March 9, 2011, 11:11 PM On Thu, 2011-03-10 at 11:43 +1100, Mark Andrews wrote:
In message <1299711449.2109.98.camel@karl>, Karl Auer writes:
On Wed, 2011-03-09 at 09:01 -0600, imNet Administrator wrote:
Where are you pinging it from? also, the 2001:db8::/32 prefix is used for "documentation purposes" and might be handled differently by the TCP/IP stack.
Works fine in Linux - I've been using it (in an isolated training room setup) for years.
Regards, K.
It is not a good idea to use the documentation prefix for anything other than documentation. How hard is it to generate a ULA and use it?
I suppose I took/take the view that it *is*, in a sense, being used for documentation.
The network is a training network, isolated from the Internet, and used for demonstration purposes. It's a good way to engrave the doco prefix in the students' minds. It also allows all the slides, exercises and other documentation to use the documentation prefix and yet directly match the demonstration network.
ULA prefixes have little internal logic and are hard to remember. Not a problem in production, but just another barrier in a training environment. "2001:db8::/32" is very easy to remember (I guess that's the point) and easy to add easy-to-use subnets into.
However, I do appreciate that it's a bit of an edge case. In my training I specifically draw the students' attention to this fact.
Thanks, K.
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Karl Auer (kauer@biplane.com.au) +61-2-64957160 (h) http://www.biplane.com.au/kauer/ +61-428-957160 (mob)
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