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Date: Fri, 18 Sep 1998 19:55:46 -0700
To: junkmale@xtra.co.nz, questions@FreeBSD.ORG
From: gummibear@we.mediaone.net
Subject: Re: Dynamic DNS
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Woah, what's this about Dynamic DNS?  Right now I have a cable modem
working with FreeBSD and I was thinking of having a smalll server on it.  I
know it migh be a no-no to do that, but I don't plan on having a killer 10
gigabyte a day transfer rate or anything like that.  I just wanted to setup
an ftp server and maybe a web server for educational purposes.

I also wanted to set up a subnet off this cable modem.  I was thinking
something in terms of this:

mediaone cable -----> my freebsd box gateway/ftp server/web server ----
(IPFW) ----> Windows Machine for my GF ----> another FreeBSD box for me

Can this be done?  I use wide-dhcp as my dhcp client.  But if I have a
dynamic IP and the dhcp client does all network work for me, how would I
know how to handle a routing table.  I've never networked before, so I'm
pretty much clueless on this.  Where can I get more info on the subject.  I
have the FreeBSD book here, but it doesn't cover dynamic IP network stuff
all that much.

Any info would be great!

Thanks,


Joey Bear Garcia


At 11:36 AM 9/19/98 +1200, Dan Langille wrote:
>I've been reading up on Dynamic DNS, which is useful if you have a dynamic 
>IP but still want to run a website, FTP server, mail server, etc. Many 
>people using ADSL or cable modems have IP addresses assigned via DHCP.  
>Dynamic DNS, in simple terms, allows you to update your DNS entries 
>dynamically.  When you get a new IP, you update the DNS entries.  Not 
>perfect.  But close.
>
>I've been looking at a few setups.  Most assign you a domain name which 
>hangs off their domain (for examples, see http://detour.net/,  
>http://www.ml.org/, etc).  A few (http://www.ddns.org/, 
>http://www.dnswiz.com/index.htm, https://dyndns.com/) allow you to host 
>your own domain.
>
>To my knowledge, the public DNS (http://soa.granitecanyon.com/) doesn't 
>provide a dynamic service but I see no reason why you couldn't write code 
>to do it for you.
>
>What dynamic DNS services have you used?  Any recommendations?
>
>--
>Dan Langille
>DVL Software Limited
>The FreeBSD Diary - my [mis]adventures
>http://www.FreeBSDDiary.com
>
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