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North American Network Operators Group

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Re: /8 end user assignment?

  • From: William Warren
  • Date: Sat Aug 06 22:10:42 2005

Actually the cable modems and Dsl modems usually have a 10.x address they are used by the ISP's to access their internal firware. Also on traces that I have done on both cable and dsl the first hop is invariably a RFC1918 address.

Steven M. Bellovin wrote:
In message <
t>, "Stephen J. Wilcox" writes:

2. We know cable companies, dsl providers and mobile companies can use this ma
ny IPs, but they generally seem to make use of NAT and IPv6. If everyone in this category who could justify a /8 applied and received them we might be in real trouble with our IPv4 space.

I had said elsewhere this was unprecedented but was then pointed at, which is Comcast assigned in April. I'm surprised none of these assignemtns have shown up on mailing lists..

When it comes to Comcast, I'm just an ordinary residential subscriber, but they don't use NAT for subscriber addresses as best I can tell. Certainly, I've never been given one, asked about one, etc.

--Steven M. Bellovin,


My "Foundation" verse:
Isa 54:17 No weapon that is formed against thee shall prosper; and every tongue that shall rise against thee in judgment thou shalt condemn. This is the heritage of the servants of the LORD, and their righteousness is of me, saith the LORD.

-- carpe ductum -- "Grab the tape"
CDTT (Certified Duct Tape Technician)

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