IPv6 Conventions

Owen DeLong owen at delong.com
Wed May 18 22:21:35 CDT 2011


On May 18, 2011, at 8:05 AM, Iljitsch van Beijnum wrote:

> On 18 mei 2011, at 16:44, Todd Snyder wrote:
> 
>> 1) Is there a general convention about addresses for DNS servers? NTP
>> servers? dhcp servers?
> 
> There are people who do stuff like blah::53 for DNS, or blah:193:77:81:20 for a machine that has IPv4 address 193.177.81.20.
> 
> For the DNS, I always recommend using a separate /64 for each one, as that way you can move them to another location without having to renumber, and make the addresses short, so a ::1 address or something, because those are the IPv6 addresses that you end up typing a lot.
> 
> For all the other stuff, just use stateless autoconfig or start from ::1 when configuring things manually although there is also a little value in putting some of the IPv4 address in there. Note that 2001:db8::10.0.0.1 is a valid IPv6 address. Unfortunately when you see it copied back to you it shows up as 2001:db8::a00:1 which is less helpful.
> 
>> 2) Are we tending to use different IPs for each service on a device?
> 
> No, the same Internet Protocol.
> 

I believe he meant different IP addresses and I highly recommend doing so.

If you do so, then you can move services around and name things independent of
the actual host that they happen to be on at the moment without having to renumber
or rename.


>> Finally, what tools do people find themselves using to manage IPv6 and
>> addressing?
> 
> Stateless autoconfig for hosts, EUI-64 addressing for routers, VLAN ID in the subnet bits. That makes life simple. Simple be good.
> 

Yep, where that works, those are fine ideas.

Owen





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