3 ms·

Yes aware of that. There are some gotchas with that, particularly address space collision between two sites with a tunnel between them. I've never seen one in v

by buffoon 11y ago

Yes aware of that. There are some gotchas with that, particularly address space collision between two sites with a tunnel between them. I've never seen one in v6 but one of our clients had a 10.0.0.0/8 and so did we and I don't want to get into that state of affairs again. I'd only use that for totally airgapped networks.

simoncion 11y ago
There's a mechanism for randomly generating a /48 with a low probability of collision. [0] SixXS maintains a list of "allocated" prefixes, [1][2] but who knows how complete it is? Edit: Also, you might be interested in reading about the NETMAP iptables/ip6tables target. See iptables-extensions(8) for more info. [0] https://tools.ietf.org/html/rfc4193#section-3.2 https://tools.ietf.org/html/rfc4193#section-3.2 [1] https://www.sixxs.net/tools/grh/ula/ https://www.sixxs.net/tools/grh/ula/ [2] https://www.sixxs.net/tools/grh/ula/list/ https://www.sixxs.net/tools/grh/ula/list/
- sanderjd 11y ago
  You seem to know a lot about this so I thought I'd ask: is there a good book getting into this level of detail about IPv6?
  - simoncion 11y ago
    I'm sure that such a book exists, but I have no idea what it is. I've picked up what I know by reading RFCs, Wikipedia pages, and the like and experimenting on my LAN. It's been quite some time, and the details are hazy, but I remember the process of getting a tunnelbroker.net tunnel configured, and the subsequent (totally optional) series of knowledge tests required to unblock IRC over the tunnel taught me a fair bit about IPv6 and some about (reverse DNS? forward DNS?) glue records. Figuring out the meaning of all of the options available in an radvd config file was also rather educational. (20->40% of the educational value was in reading about things that were tangentially related to whatever the radvd configuration item was.)

by buffoon 11y ago

simoncion 11y ago

There's a mechanism for randomly generating a /48 with a low probability of collision. [0] SixXS maintains a list of "allocated" prefixes, [1][2] but who knows how complete it is? Edit: Also, you might be interested in reading about the NETMAP iptables/ip6tables target. See iptables-extensions(8) for more info. [0] https://tools.ietf.org/html/rfc4193#section-3.2 https://tools.ietf.org/html/rfc4193#section-3.2 [1] https://www.sixxs.net/tools/grh/ula/ https://www.sixxs.net/tools/grh/ula/ [2] https://www.sixxs.net/tools/grh/ula/list/ https://www.sixxs.net/tools/grh/ula/list/

sanderjd 11y ago
You seem to know a lot about this so I thought I'd ask: is there a good book getting into this level of detail about IPv6?
- simoncion 11y ago
  I'm sure that such a book exists, but I have no idea what it is. I've picked up what I know by reading RFCs, Wikipedia pages, and the like and experimenting on my LAN. It's been quite some time, and the details are hazy, but I remember the process of getting a tunnelbroker.net tunnel configured, and the subsequent (totally optional) series of knowledge tests required to unblock IRC over the tunnel taught me a fair bit about IPv6 and some about (reverse DNS? forward DNS?) glue records. Figuring out the meaning of all of the options available in an radvd config file was also rather educational. (20->40% of the educational value was in reading about things that were tangentially related to whatever the radvd configuration item was.)