Re: Dantz Retrospect, Piton multicast, security, and XP SP2
From: Barry Margolin (barmar_at_alum.mit.edu)
Date: 08/28/04
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Date: Sat, 28 Aug 2004 17:30:13 -0400
In article <5c0dbfb4.0408280550.4e67c184@posting.google.com>,
jfaughnan@spamcop.net (John Faughnan) wrote:
> With your hints it was easy to find this referece.
>
> http://www.sgr.nada.kth.se/mac/docs/retrospect_ttl.html.en saying they
> use a TTL of 1.
>
> So they use a multicast IP address, but the packets will either die on
> my AirPort router, or at my ISP's router. They mention "port 497"
> packets on the Internet -- would that fit with an enterprise doing
> backup across the Internet? The enterprise would configure their
> router to pass that packet to another router they owned across the
> internet?
Port numbers are used to identify applications and client processes;
their use of port 497 is analogous to the way HTTP uses port 80 and DNS
uses port 53.
Since the packets have TTL of 1, they don't ever go through routers, so
there's no need to configure the routers to pass this port.
-- Barry Margolin, barmar@alum.mit.edu Arlington, MA *** PLEASE post questions in newsgroups, not directly to me ***
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