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Re: Lookup zip by IP address [message #172939 is a reply to message #172937] Sat, 12 March 2011 14:16 Go to previous messageGo to previous message
Roy Smith is currently offline  Roy Smith
Messages: 11
Registered: November 2010
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In article <ilfs0n$3ga$1(at)news(dot)eternal-september(dot)org>,
Jerry Stuckle <jstucklex(at)attglobal(dot)net> wrote:

> For the record, IPv4 and IPv6 refer ONLY to the number of bytes in the
> IP address. They have NOTHING to do with the protocol itself

Actually, IPv4 and IPv6 *are* completely different (although related)
protocols. For sure, the most obvious difference between them is the
length of the addresses, but there are other differences as well. The
header formats are different, and there are fundamental differences in
how they deal with options, routing, MTU, traffic flows, etc. Wikipedia
does a decent job comparing the two
(http://en.wikipedia.org/wiki/Ipv6#Comparison_to_IPv4).

> IPv4 was heavily used by Arpanet back in the 1960's - which would
> have been VERY hard to do if it hadn't been invented until 1981.

To the best of my knowledge, the first RFC describing what we now call
IPv4 was RFC 760, published in January 1980. This was updated by RFC
791, published in September 1981. I'm not sure when the first
experimental versions were deployed, but it's absurd to say that IPv4
was in use (heavy or otherwise) in the 1960s.

> I never hear anyone (except you) use IP to refer to an address.
> Everyone else uses the term "ip address" - which is correct.

People often say "IP" when they mean "IP address" in casual
conversation. "I can't reach foo.com, can you try pinging it?". "OK,
what's the IP?" It's sloppy, but lots of casual conversation is sloppy,
and people figure out the meaning from context.
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