Re: rewrites.mfp and IPv6 addresses ... seems to not blow up

[email protected] replied to my note:

<> > So, setting up crm114 for someone else led me to a seriously overdue
<> > cleanup of my own rewrites.mfp file.  I decided that it's probably
<> > just doing string replacements to normalize the data, so it should
<> > deal just fine with an IPv6 colon separated address.
<> >
<> > So far, it seems to do so just fine, so, Bill, I think you can call
<> > crm114 "IPv6 compliant"
<> 
<> So - all those colons didn't get the knickers in a twist?  :-)

Apparently not <grin>

<> I guess :*: and :+: don't appear much in IP6 addresses - or, if they
<> do, then whatever follows it until the next colon doesn't map
<> to a preexisting variable.

Nope, those two strings will never appear in an address.  A v6 address
is comprised of eight units of four hex digits separated by colons:

  2001:0470:1f07:61e:52e5:49ff:fe55:6731

Leading zeros can be dropped and units that are all zero can be
dropped, ONCE, in an address:

  2001:470:1f07:61e::3		(global address in the same block as above.
				 same host, actually)
  fe80::52e5:49ff:fe55:6731	(link-local address - not routable)
  ::1				(loopback address)

and that's about all the variation you can expect to see.  For full
gory details, the wikipedia entry for "IPv6 Address" is quite good.

<> That's one bug in the syntax; I wrote CRM114's expansion syntax
<> fifteen years ago and had no idea about IPV6.  Then again, RFC
<> 2460 only came out in 1998 which was about the same time.

Yeah, well, I'm reasonably sure I babled at you about v6 at some point
prior to 2000 seeing I was running early code in Waltham <laugh>

Reto
-- 
R A Lichtensteiger	[email protected]

    In anything at all, perfection is finally attained not when there
    is no longer anything to add, but when there is no longer anything
    to take away. - Antoine de Saint-Exupery

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