This remains a continuing thread on NANOG.
My personal view is that the world has certain ISPs, such as cais.net
DSL and apparently US West in your example, that exist for the same
reason as do warthogs: to make roses even more beautiful.
Several major ISPs have this pernicious practice, which confuses
traceroute (in several ways), reverse DNS, and MTU path discovery.
They are ISPs with significant allocations of address space and
should be able to get more.
I personally believe that anyone that uses private address space in a
path where public traffic will EVER route through one of the
addresses, is, at best, being irresponsible. Sort of like looking
for the gas leak with a lighted match.
>I did a traceroute to one of US West's customers... got some
>interesting results:
>
>13 206 ms 179 ms 123 ms gig0-0-0.phnx-sust1.phnx.uswest.net
>[206.80.192.253]
>14 1016 ms 151 ms 975 ms 207.224.191.2
>15 233 ms 124 ms 123 ms 192.168.8.1
>16 151 ms 179 ms 123 ms 192.168.100.147
>17 247 ms 192 ms 151 ms vdsl-130-13-102-120.phnx.uswest.net
>[130.13.102.120]
>
>RFC 1918 - "Address Allocation for Private Internets" indicates
>192.168.0.0 through 192.168.255.255 (192.168/16 prefix) is reserved
>for private internets. Hops 15 and 16 in my traceroute show that
>addresses within this range are being used publically.
>
>Did I miss something? Have the "for private use only" IP addresses
>now been given the green light to be used within the internet?
>
> -- Leigh Anne
>
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