nanog mailing list archives

Re: any dangers of filtering every /24 on full internet table to preserve FIB space ?


From: Randy Bush <randy () psg com>
Date: Mon, 10 Oct 2022 12:38:33 -0700

< rant >

there once used to be 'swamp' space, down in the low 190s where /24s
were expected.  and folk/rirs tried to keep shorter aggregates, e.g.
/19s, as the norm above swamp (negotiated at ietf/danvers).  in those
days, one could actually filter above swamp on /19.  for a while, one
could even have classful filters in A and B space.

and a soda pop used to be a nickel or a dime.  those days are long
gone.

i expect that we will accept prefixes longer than /24 as things get
tighter.  and i doubt we can socialize constraining that fragmentation
to one section of the space.

it is a tragedy that cidr and an open market has helped us more than
ipv6 has.

randy


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