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0 pointswillis9364y ago0 comments

My two data points:

- Spectrum gave me /64.

- Comcast gives me /128.

0 comments

ArchOversight4y ago

Spectrum and Comcast both will happily hand out prefix delegations that are larger than the /64.

Comcast for example right now is giving me a /128 for my router, and a /60 which I have used to set up multiple VLAN's.

Spectrum will give you a /56 in a prefix delegation, and a /128 for the router.

Dagger24y ago

Comcast uses /64 for the WAN network and will give you up to a /60 routed prefix for LAN-side networks.

pilif4y ago

Which means the /64 is not usable if you want to do subnetting and use SLAAC and the /128 is not useable at all if you have more than one machine.

No such issues with v4.

That was my point about subnetting.

willis936OP4y ago

I had the /64 via DHCPv6-PD/SLAAC.

The /128 is given to any clients that connect as there is no NAT and the ISP isn't worried if I use a thousand addresses.

pilif4y ago

A /128 is a single address and given the state of v6 NAT that means it can’t be shared with other machines in your network which means only your router will be able to access the v6 internet without the router being a proxy and you using it

willis936OP4y ago

No it means my router is not routing IPv6 traffic. It doesn't need to though. My router and all of my computers each have /128 addresses. No issues. 19/20 on ipv6-test.com.

uvesten4y ago

I got a /48, and I think it will take me a while to put all those addresses in use. I'm using 9-10 now, so while I've certainly started down the path, the end is not in sight just yet.

pilif4y ago

You need a /48 (or /56) if you want to do your own subnetting and keep using SLAAC (which is the default way for assigning v6 addresses and detecting address conflicts).

A /64 is not enough for that. You can still create your own subnets, but you will be on your own with address assignment

1 more reply

j / k navigate · click thread line to collapse

0 comments

ArchOversight4y ago

Spectrum and Comcast both will happily hand out prefix delegations that are larger than the /64.

Comcast for example right now is giving me a /128 for my router, and a /60 which I have used to set up multiple VLAN's.

Spectrum will give you a /56 in a prefix delegation, and a /128 for the router.

Dagger24y ago

Comcast uses /64 for the WAN network and will give you up to a /60 routed prefix for LAN-side networks.

pilif4y ago

Which means the /64 is not usable if you want to do subnetting and use SLAAC and the /128 is not useable at all if you have more than one machine.

No such issues with v4.

That was my point about subnetting.

willis936OP4y ago

I had the /64 via DHCPv6-PD/SLAAC.

The /128 is given to any clients that connect as there is no NAT and the ISP isn't worried if I use a thousand addresses.

pilif4y ago

willis936OP4y ago

No it means my router is not routing IPv6 traffic. It doesn't need to though. My router and all of my computers each have /128 addresses. No issues. 19/20 on ipv6-test.com.

uvesten4y ago

I got a /48, and I think it will take me a while to put all those addresses in use. I'm using 9-10 now, so while I've certainly started down the path, the end is not in sight just yet.

pilif4y ago

You need a /48 (or /56) if you want to do your own subnetting and keep using SLAAC (which is the default way for assigning v6 addresses and detecting address conflicts).

A /64 is not enough for that. You can still create your own subnets, but you will be on your own with address assignment

1 more reply

j / k navigate · click thread line to collapse