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Re: Renumbering

2007-09-13 22:09:47
On Thu, Sep 13, 2007 at 07:43:38PM +0100, Tony Finch wrote:
On Thu, 13 Sep 2007, David Conrad wrote:

How do you renumber the IP address stored in the struct sockaddr_in in a
long running critical application?

Applications that don't respect DNS TTLs are broken for many reasons, not
just network renumbering.

Tony.

I know of one application that relied on long-lived DNS hostname to IP
mappings and ignored DNS TTLs.  Search engine crawlers cached the IP
addresses for pages that had been fetched, and used those addresses
even though the TTLs had expired.  This resulted in pages from
whatever content lived at those new IP addresses showing up
unexpectedly (incorrectly) in search engine results.  I don't know if
this has been fixed, but it's an example of application usage that
bypassed IETF recommendations for a presumably good cause (performance
reasons).

Another application with a similar reliance that is seeing some growth
is the use of IP addresses for geotargeting.  The geotargeting
provider attempts to determine the physical location of the IP address
for various purposes, such as to choose what ads to display.  I
imagine people on this list can see the flaws of doing this, but
nevertheless it persists.  I don't know how the geotargeting
providers plan to handle IPv6, but it's another example of how people
develop applications in ways that the IETF may not anticipate (because
they discourage such applications), but make migration to IPv6
difficult because of the installed base that depends upon specific
uses of IPv4 addresses.

--gregbo

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