Search Again: Re: DNS and DHCP From: Men & Mice Support Date: Monday, October 8, 2001 Time: 10:30:14 am At 10:47 AM -0500 10/8/01, Alan Ordway wrote: >Hi, >I am wondering if there is a way to use QDNS with dynamic dns and >dhcp? What this would do is assign a dns entry for the dhcp client >based on the client info. If it is not possible, this would be a >nice feature. Unfortunately, this is a simple question with a fairly complex answer. I'm not entirely sure of my facts on how it works (though thanks to Len Conrad I have some idea of how Microsoft's solution works), but there are several components involved, including some quite complex security issues. Below is my understanding of the whole problem. Of course, Bind supports one of the necessary pieces of this puzzle, "dynamic update". However, the security model in Bind for this is fairly rudimentary, so a separate "key server" is necessary to keep track of all of the client "accounts" - the usernames and passwords of all of the clients who are allowed to update the DNS data. This is where things get difficult. Does the DHCP server notify the key server, or does the client machine? Having the DHCP server do the job has some problems, including the fact that the DHCP server would need to be modified to do so. So one might think that the client machine should do so. But this requires integration with the DHCP client, or else, if a small time lag is acceptable, a separate program on the client can periodically check for new DHCP leases and notify the key server. Microsoft's solution is actually both - the key server is integrated into their proprietary DNS server, and both client and DHCP server notify the key server (though I believe this has changed in more recent versions... or maybe it's that way now and was different earlier). As I recall, the client notifies the key server of the required A record, and the DHCP server notifies the key server of the required PTR record. Of course, almost none of this is directly related DNS service. The only part that a DNS server plays is in supporting and responding to dynamic update messages. QuickDNS for classic Mac OS does not support this. ____________________________________________________________________ Chris Buxton Men & Mice cbuxton@menandmice.com Making DNS Easy

Messages In This Thread: DNS and DHCP by Alan Ordway on Oct 8, 2001 at 8:56:30 am Re: DNS and DHCP by Frank Laszlo on Oct 8, 2001 at 9:14:28 am Re: DNS and DHCP by Men & Mice Support on Oct 8, 2001 at 10:30:14 am Re: DNS and DHCP by Len Conrad on Oct 8, 2001 at 11:39:24 am DNS and DHCP by Global Homes Webmaster on Feb 6, 2002 at 11:39:13 am Re: DNS and DHCP by Steffan A. Cline on Feb 6, 2002 at 12:08:02 pm Re: DNS and DHCP by Global Homes Webmaster on Feb 6, 2002 at 12:38:29 pm Re: DNS and DHCP by Warren Michelsen on Feb 6, 2002 at 3:34:01 pm Re: DNS and DHCP by Global Homes Webmaster on Feb 6, 2002 at 3:41:26 pm Re: DNS and DHCP by Men & Mice Support on Feb 6, 2002 at 3:49:45 pm Re: DNS and DHCP by Global Homes Webmaster on Feb 6, 2002 at 4:04:25 pm Re: DNS and DHCP by Len Conrad on Feb 6, 2002 at 4:21:08 pm Re: DNS and DHCP by Global Homes Webmaster on Feb 7, 2002 at 9:58:09 am