3 ms·

> IPv6 /126 Uh, unless you're running BGP over this or getting a larger subnet statically routed to you, get a larger prefix. A /48 or /56 is the current recom

by q3k 7y ago

> IPv6 /126 Uh, unless you're running BGP over this or getting a larger subnet statically routed to you, get a larger prefix. A /48 or /56 is the current recommendation [1] for business end site allocations. [1] - https://tools.ietf.org/html/rfc6177 https://tools.ietf.org/html/rfc6177

souterrain 7y ago
Of course, this is just a “point-to-point Ethernet” not an allocation. That said, I think the original intent was that such “point-to-point Ethernets” should have been issued /64, but seems /126 is common practice.
- throw0101a 7y ago
  Actually many ISPs do not even give out a fully routable /126, but simply use an LL fe80:: address for the CPE: * https://www.ripe.net/publications/docs/ripe-690#4-1-2--unnumbered https://www.ripe.net/publications/docs/ripe-690#4-1-2--unnum...
- colechristensen 7y ago
  Comcast gives out /64s at least. I got my router to successfully ask for 2 on different interfaces.
  - drbawb 7y ago
    Same story on Spectrum. On their residential plans they will give out a /64 by default. However w/ DHCPv6-PD I was able to successfully request a /56. What I found mildly interesting was they wouldn't allocate a /60. (My guess was: whatever silicon they've got pushing IPv6 packets around probably likes segmenting the routing table on a clean byte boundary.)
windexh8er 7y ago
Providers don't give out publicly routable /126. Generally most providers aren't going to give out anything longer than a /64 partially because they don't need to and partially because routing tables [0]. They want to route to you via a prefix that's pre-allocated to carve up for the region you're in. [0] https://www.ripe.net/publications/docs/ripe-690 https://www.ripe.net/publications/docs/ripe-690
- kitteh 7y ago
  A /48 is the minimum folks will pass via bgp on the internets (it's the /24 of the ipv6 world). Also another fyi: if you're rolling commodity hw (bcm tridents etc) after a /64 up to /128 you are dipping into another constrained forwarding table - can't fill your box with too many of those.
bscphil 7y ago
> A /48 or /56 is the current recommendation [1] for business end site allocations. I can get a /56 even at my apartment just by setting my router to request it.
Avamander 7y ago
Many VPS providers (for ex. OVH) also do the same thing and provide a single IPv6 address.

by q3k 7y ago

souterrain 7y ago

Of course, this is just a “point-to-point Ethernet” not an allocation. That said, I think the original intent was that such “point-to-point Ethernets” should have been issued /64, but seems /126 is common practice.

throw0101a 7y ago
Actually many ISPs do not even give out a fully routable /126, but simply use an LL fe80:: address for the CPE: * https://www.ripe.net/publications/docs/ripe-690#4-1-2--unnumbered https://www.ripe.net/publications/docs/ripe-690#4-1-2--unnum...
colechristensen 7y ago
Comcast gives out /64s at least. I got my router to successfully ask for 2 on different interfaces.
- drbawb 7y ago
  Same story on Spectrum. On their residential plans they will give out a /64 by default. However w/ DHCPv6-PD I was able to successfully request a /56. What I found mildly interesting was they wouldn't allocate a /60. (My guess was: whatever silicon they've got pushing IPv6 packets around probably likes segmenting the routing table on a clean byte boundary.)

windexh8er 7y ago

Providers don't give out publicly routable /126. Generally most providers aren't going to give out anything longer than a /64 partially because they don't need to and partially because routing tables [0]. They want to route to you via a prefix that's pre-allocated to carve up for the region you're in. [0] https://www.ripe.net/publications/docs/ripe-690 https://www.ripe.net/publications/docs/ripe-690

kitteh 7y ago
A /48 is the minimum folks will pass via bgp on the internets (it's the /24 of the ipv6 world). Also another fyi: if you're rolling commodity hw (bcm tridents etc) after a /64 up to /128 you are dipping into another constrained forwarding table - can't fill your box with too many of those.

bscphil 7y ago

> A /48 or /56 is the current recommendation [1] for business end site allocations. I can get a /56 even at my apartment just by setting my router to request it.

Avamander 7y ago

Many VPS providers (for ex. OVH) also do the same thing and provide a single IPv6 address.