On Sun, 25 Feb 2001, Leigh Anne Chisholm wrote:
> 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?
Yes you did. You can use RFC1918 addresses internal to your network. In
the above, uswest is using the space internal to their network. Its ok to
build internal PtP links using rfc1918, since traffic isn't
source/destined directly for these links, only thru them.
The down side is you may end up with some Path MTU discovery
issues.........
Also, you should not see the 192.168.x.x in your trace route, if your
blocking rfc1918 inbound at your border, which is always a good idea.
Brian
>
>
> -- Leigh Anne
>
>
>
>
> _________________________________
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