Point 2 point IPs between ASes

William Herrin bill at herrin.us
Thu Jun 29 15:44:32 CST 2017

On Thu, Jun 29, 2017 at 12:51 AM, Aaron Gould <aaron1 at gvtc.com> wrote:

> Thanks Bill, I thought with ipv6 it was a sin to subnet on bit boundaries
> and not on nibble boundaries.

Hi Aaron,

Not a sin but you're making more work for yourself if you subnet on
other-than four-bit nibble boundaries. Each character in the hexadecimal
printed version of the IPv6 address is 4 bits, aka 1 nibble. So subnetting
on a nibble boundary means that each character in the address is either
part of the network portion of the address or part of the host portion of
the address, never both.

Conveniently, IPv6 reverse DNS also delegates on the nibble boundary.

Heck, I’m gonna do whatever it takes to NOT subnet on bits with my v6
> deployment.  Hopefully with v6, gone are the days of binary subnetting math.

Good plan.


William Herrin ................ herrin at dirtside.com  bill at herrin.us
Dirtside Systems ......... Web: <http://www.dirtside.com/>

More information about the NANOG mailing list