I know this is getting way OT from CF so this is my last post on this but it
does illustrate the point...

> When I was on NTL, my box just got a public IP. 

It's unlikely that you ever got a truly public IP using NTL cable however I
would have to say depending on the region you lived in it would have been
dependant on the incumbent cable providers infrastructure that NTL took
over... We were in a Diamond Cable area many moons ago... My router/firewall
currently reports its public IP address as 81.102.3.61 however these are the
results I get from various sites on the web

whatismyip.com = 82.3.32.73
whatismyip.co.uk  = 81.102.3.61
whatismyip.org = 82.3.32.77

northdelta.net = 82.3.32.72
grc.com = 81.102.3.61 

As you can see from this, only two sites out of 5 actually record the
correct IP address and in fact grc.com actually successfully resolved the
reverse lookup too. NTL run a set of transparent proxies that are
essentially configured like gateways and you route through specific ones
when accessing specific IP ranges and its these machines that the servers
are picking up the IP addresses for. In my region, there are 7 transparent
caching proxies running in the IP range of 82.3.32.71 through to 82.3.32.77.
What other people have in other regions, I have no idea..

Also, to add to the confusion that is the NTL network, the box on the other
end of my cable modem that lives somewhere in the NTL infrastructure
actually pings and shows up in traceroutes as a private IP of
10.146.39.254... It's all good fun...

Paul


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