Date: Wed, 06 Apr 2005 09:40:28 +0200 From: "Martin Petraschek" <petraschek@ftw.at> To: "Dan Nelson" <dnelson@allantgroup.com> Cc: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org> Subject: Re: Viewing DNS cache entries Message-ID: <BLACKHOLENtzsG06vdG000027b7@mail.ftw.at> In-Reply-To: <20050405155651.GD64927@dan.emsphone.com>
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>In the last episode (Apr 05), Martin Petraschek said: >> On Tue, 5 Apr 2005 10:36:35 -0500, Dan Nelson wrote: >> >In the last episode (Apr 05), Martin Petraschek said: >> >> The operating system is caching DNS name resolutions in order to >> >> avoid repeated DNS requests for the same hostname. Is it possible >> >> to display the entries of that DNS cache? >> >> >> >> Under Windows, the command "ipconfig /displaydns" exists, and I >> >> would need that functionality under FreeBSD. >> > >> >You can use the "rndc dump" command, which will create a file that >> >contains all of the currently-cached DNS entries. If you are >> >> The rndc command does not exist on my 4.10 box. > >It was called "ndc" in bind 8 (which is what comes with 4.*). > >> Anyhow, I am not running a nameserver on this machine. Is this a >> prequisite for your suggestion to work? > >Yes; if you are not running a nameserver, then the OS won't cache any >DNS entries at all. Every lookup will result in a DNS request to one >of the servers listed in /etc/resolv.conf. Maybe you have some static >entries in /etc/hosts? That file is checked before DNS; edit >/etc/host.conf to change the lookup order. Thank you, Dan. I was not aware of the fact that FreeBSD does not cache DNS entries unless you are running a name server.
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