nanog mailing list archives

Re: Crawler Ettiquette


From: Bob K <melange () yip org>
Date: Wed, 23 Jan 2002 15:37:48 -0500


<embarassed look>

Er, I just re-read that, and now understand what you meant by c).
Sorry for the wasted bandwidth.

On Wed, Jan 23, 2002 at 03:29:38PM -0500, Bob K wrote:

On Wed, Jan 23, 2002 at 02:35:17PM -0500, Deepak Jain wrote:
[snip]
This information will be made available to research institutions and
other concerns.
[snip]
    c) Allow ISP's caches to sync with it.
[snip]
ISPs who cache would have an advantage if they used the cache developed by
this project to load their tables, but I do not know if there is an
internet-wide WCCP or equivalent out there or if the improvement is worth
the management overhead.
[snip]

Assuming that the info will be made available in html format, the only
thing you really need to do to achieve c) is to choose an appropriate
value for the http-equiv="Expires" meta-tag when serving the info, and
have a cron job at each ISP make a request for the info at some
arbitrary time.  This last step really isn't that useful unless there
are points of congestion, or times when the servers are bogged down.

The caches have to respect the Expires tag, though, and a broken clock
can cause all sorts of fun on that end...

-- 
Bob <melange () yip org> | Please don't feed the sock puppet.

-- 
Bob <melange () yip org> | Please don't feed the sock puppet.


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