IPv6 subnets

> We are also offering the ability to have an entire /64 or /56 subnet routed to one of your IPv6 addresses – even one of the Pool addresses, which means you can fail over the entire subnet.

IPv6 addresses are 128-bit… so does this mean we can get a subnet of 2^64 or 2^72 IPv6 addresses?! Is there any charge for these subnets or are they free too?

I'm only asking since it sounds like a really big range, so I'm surprised you can offer them :)

8 Replies

See RFC 6177 for the current recommendations.

Hello,

http://www.linode.com/IPv6/#can-i-get-m … v6-address">http://www.linode.com/IPv6/#can-i-get-more-than-one-ipv6-address

-Chris

@Keiji:

> We are also offering the ability to have an entire /64 or /56 subnet routed to one of your IPv6 addresses – even one of the Pool addresses, which means you can fail over the entire subnet.

IPv6 addresses are 128-bit… so does this mean we can get a subnet of 2^64 or 2^72 IPv6 addresses?! Is there any charge for these subnets or are they free too?

I'm only asking since it sounds like a really big range, so I'm surprised you can offer them :)

Yes, those figures are correct. AFAIK there is no charge, you just need to open a support ticket to request them.

@caker:

Hello,

http://www.linode.com/IPv6/#can-i-get-m … v6-address">http://www.linode.com/IPv6/#can-i-get-more-than-one-ipv6-address

-Chris

Yes, if you read the page you'd just linked to, you'd notice I actually quoted it :D

I was only asking for some confirmation, but GLaDOSDan has done so, so this question is answered now. Thank you!

Please don't say things like that, I know you are joking but I didn't mean to embarrass the staff…

@Keiji:

IPv6 addresses are 128-bit… so does this mean we can get a subnet of 2^64 or 2^72 IPv6 addresses?! Is there any charge for these subnets or are they free too?

I'm only asking since it sounds like a really big range, so I'm surprised you can offer them :)
/64 is the minimum subnet size typically used; giving end users a /56 or even a /48 is common and recommended practice*. Yes, the IPv6 designers were a bit nuts, but when ISPs typically have a /32 at minimum – Linode has several -- there's a lot of room to go nuts in.

  • That's more aimed at normal end user ISPs -- i.e. cable, DSL, etc. -- whose users probably have a $50 router or two, than a VPS provider, though.

It's recommended practice to be wasteful?

A /64 block is certainly useful because it allows stateless autoconfiguration within a network you control. A /56 block can be useful because it allows you to hand out /64 blocks if you need to for some reason. If you're not an ISP, you don't really need a /48 block or anything larger. If you run out of /64 blocks in your /56 block, you can just get another /56 block instead.

This just in, Junior members know more about Linode than Linode staff!

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