dhcpcd-discuss

Howdy,

So Comcast will give out three kinds of addresses. If you do an ia_na 
you'll get a ::/128 address. If you do an ia_pd you'll get a ::64 
address by default. And ...

If you do an ia_pd and "ask for one" (electronically) you'll get a ::/60 
with four bits for your internal subnets. [I know /60 is the magic 
number but I don't know if you can get other values between /60 and /64.]

I can not figure out how to "ask for one" using dhcpcd. Apparently 
"wide-dhcp" (or some name like that) will format a request with the 
necessary preferred prefix length because of being able to set an 
sla_len or something.

I see some syntactic definitions for IAPREFIX but, if it _is_ in-place 
and functional, I can't figure out how to make one and attach it to the 
ia_pd.


I would have _expected_ some syntax like:

ia_pd 7/4 int0 int1 # not currently valid syntax

or

ia_pd 7 int0/1/1 int1/2/3 # currently valid syntax

to "shave off" the largest prefix supplied (e.g. four (4) in example 1, 
or three(3) in example two) from the request so that the request would 
go out for a prefix with the shaved value (e.g. ::/60 in example one, or 
::/61 in example two) such that the sum of the request length and the 
largest specified prefix is 64.

ALTERNATELY... adding an (optional) explicit term with the actual 
desired prefix length might be better.

ia_pd ::/48 (rest of syntax here)

--- So am I missing something or is the feature nonexistent?

-- Rob White.