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Comment by sigjuice

9 years ago

Interesting. Anyone know what they mean by

We are using a 'swamp' class C 192.94.73...?

Edit: Found https://tools.ietf.org/html/rfc4632 (CIDR: The Internet Address Assignment and Aggregation Plan), which says this. Still not quite sure what they mean.

   Note that, as defined, this plan neither requires nor assumes the
   re-assignment of those parts of the legacy "Class C" space that are
   not amenable to aggregation (sometimes called "the swamp").

3 comments

sigjuice

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daurnimator  9 years ago

Good question. Some quick googling turned up: https://www.safaribooksonline.com/library/view/bgp/978059600...

> Since more than half the global routing table consists of /24 announcements, those are the first candidates for being filtered. More aggressive filters may even filter out everything smaller than the smallest assigned PA blocks, possibly with some exceptions for “the swamp,” the part of the Class C space assigned in pre-CIDR days(192.x.x.x and part of 193.x.x.x). The currently allocated smallest PA blocks are /20, but much of the Class C space is allocated to ISPs in /19 and larger blocks.

jpwgarrison  9 years ago

(paid up sdf user since ~2004) FWIW they had to give back that IP space to the actual owner a few months back and are in the 205s now.