IPv6 Assignment for Server

[Eric Vyncke (evyncke)]

I wonder why you would like to do that rather than asking for a /60 at your ISP though :-)

You 2nd design MAY work but deviates from the IPv6 spec on LAN AFAIK. It will break SLAAC (so static configuration is required) and some routers and host implementations may (rightfully) complain. But you have decent chance that it works

-éric

From: Teerapatr Kittiratanachai <maillist.tk at gmail.com<mailto:maillist.tk at gmail.com>>
Date: mercredi 18 juin 2014 08:30
To: Eric Vyncke <evyncke at cisco.com<mailto:evyncke at cisco.com>>
Cc: "ipv6-ops at lists.cluenet.de<mailto:ipv6-ops at lists.cluenet.de>" <ipv6-ops at lists.cluenet.de<mailto:ipv6-ops at lists.cluenet.de>>
Subject: Re: IPv6 Assignment for Server

Thank you, I forgot to think about NS and NA.

One more question, If I got the /64 mask from ISP and implement as below. Theoretically, is it work?

Normal Situation: work fine
IPv6 Internet ----- ISP (2001:db8:a:1::1/64) ----- (2001:db8:a:1::2/64) MyPC

My Implementation: is it possible?
IPv6 Internet ----- ISP (2001:db8:a:1::1/64) ----- (2001:db8:a:1:0::2/80) MyRouter (2001:db8:a:1:a::1/80) ----- (L2 SWITCH) ----- (2001:db8:a:1:a::2/80) MyPCs

So from my router will also be IPv6 network with Global Unicast address.

--Te


On Wed, Jun 18, 2014 at 1:14 PM, Eric Vyncke (evyncke) <evyncke at cisco.com<mailto:evyncke at cisco.com>> wrote:
Not sure whether I fully understand the question in all details, but:

  1.  on a LAN/WLAN (basically where NS/NA is required to work, = broadcast domain with MAC addresses), the use of a /64 prefix is recommended
  2.  Each host (being server or client) must have at least one global address within this prefix

If you have one server per LAN, then it is perfectly OK to use one /64 per server. If you think about that, currently you use a /32 for IPv4 address :-) You are currently wasting more space (4 billion times more)

-éric

From: Teerapatr Kittiratanachai <maillist.tk at gmail.com<mailto:maillist.tk at gmail.com>>
Date: mercredi 18 juin 2014 05:28
To: "ipv6-ops at lists.cluenet.de<mailto:ipv6-ops at lists.cluenet.de>" <ipv6-ops at lists.cluenet.de<mailto:ipv6-ops at lists.cluenet.de>>
Subject: IPv6 Assignment for Server

Dear IPv6-Ops,

I want the suggestion about the best practice for assign IPv6 Global Unicast address for server.
According to the IPv6 Subnet ID also be built in with IPv6 address, so if I assign the /64 mask to the server is it will be some of wasteful usage?
AFAIK, the /64 mask address can be brought to use for many other subnets. Is it more suitable to assign the /128 to the server, or end server that doesn't act as any other gateway.

Thank you in advance.

Regards,
Teerapatr Kittiratanachai (Te)

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