Date: Sat, 9 Aug 2003 19:18:48 +0200 (CEST) From: Oliver Fromme <olli@lurza.secnetix.de> To: simon@freebsd.org (Simon L. Nielsen) Cc: freebsd-hubs@freebsd.org Subject: Re: Requirements Final Draft Attempt #2 :-/ Message-ID: <200308091718.h79HImZ1094212@lurza.secnetix.de> In-Reply-To: <20030809002252.GB53916@FreeBSD.org> from "Simon L. Nielsen" at Aug 09, 2003 02:22:54 AM
next in thread | previous in thread | raw e-mail | index | archive | help
Simon L. Nielsen wrote: > On 2003.08.09 01:26:54 +0200, Oliver Fromme wrote: > [...] > > It doesn't do any DNS zone transfers, so it is not affected > > by reluctant DNS servers. Instead, the list of CC subdomains > > is hardcoded. For each subdomain, it starts at ftp.$DOMAIN, > > ftp1.$DOMAIN and increases the number until a host cannot be > > resolved. That seems to be a better approach than relying > > on zone transfers. > > One little problem is when a number is skipped. E.g. your script > doesn't pick up ftp3.dk.freebsd.org, since there is no ftp2. I don't > know if there are any other special cases like this, but it's not that > important right now. I didn't know that there are "holes" in some countries' list of servers. In Germany, when one server goes away, we just duplicate another server, so there are no holes. That's why ftp3.de.freebsd.org and ftp6.de.freebsd.org point to the same machine. However, it seems that there is no "official" requirement to avoid gaps in the list. But that's not a big problem. I changed the script to try two more times, so it can jump over (small) gaps, at the expense of a few more DNS lookups. I re-ran the collector, and now ftp3.dk is in the list, among 45 other hosts that were missing before. :) Another possibility would be to try a zone transfer first, and if that fails, fall back to the existing algorithm. But I'm not sure if it is worth it. Regards Oliver -- Oliver Fromme, secnetix GmbH & Co KG, Oettingenstr. 2, 80538 München Any opinions expressed in this message may be personal to the author and may not necessarily reflect the opinions of secnetix in any way. "Any sufficiently advanced technology is indistinguishable from magic." Arthur C. Clarke's Third Law, from Profiles of the Future
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200308091718.h79HImZ1094212>