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Re: Lookup zip by IP address [message #172940 is a reply to message #172939] Sat, 12 March 2011 15:02 Go to previous messageGo to previous message
Jerry Stuckle is currently offline  Jerry Stuckle
Messages: 2598
Registered: September 2010
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On 3/12/2011 9:16 AM, Roy Smith wrote:
> 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).
>

Of course there have to be minor differences in the headers to identify
whether they're using IPv4 or IPv6. And there have been some minor
changes with the routing, etc - but those could easily have been
implemented in IPv4, also. They just weren't.

>> 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.
>

Then what was I using in the early 70's while in college? And what was
I working on in the late 70's when I worked for IBM?

Arpanet used TCP/IP, and was in existence in the 60's. And it used 4
byte addresses.

RFC's came about LONG after Arpanet was developed.

>> 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.

Yes, casual conversations, I agree. But not like "Pointed Head"
indicated.

--
==================
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Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
==================

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