I do this for my Laptops. They can pick up an address from the local network (where ever I am visiting, Airports, Data Centers, friends, work - etc) and then update the info back home on my own network.
Basics - when DHCPCD gets an IP from upstream - it uses nsupdate to send this info to a dynamic zone hosted on your side. Problems: The zone on your side needs to be dynamic - so should be separate from your normal "static" zone, The comms should really be secure - so you're going to learn a little about dnssec-keygen and signatures. This is actually an exercise that we get students to carry out in a DNS training lab - but once set up - it works well and totally automated if DHCP is being used. Ah! - I run Linux on my Laptops. I don't do Windows - but there could be a way. Does this interest you? So my assumptions are you are using BIND and some sort of Unix/Linux??? On your home zone, create a new zone called 'dhcp.abc.com'. Use lowish TTL's, you'll need a 'complete' zone ie SOA and NS records. Add the name of your machine here with the current A record. Other stuff like a KEY record can be added later (a SIG(0) public key) Add this new zone to any Slaves and to your own named.conf. In your abc.com - add a CNAME record for your machine pointing to the new zone.. machine IN CNAME machine.dhcp.abc.com That separates the Dynamic stuff away from the static stuff! It should also still resolve - but we are not finished. Let me know if I should carry on. On Thu, 2010-12-30 at 23:13 -0600, Jeff Justice wrote: > I have a computer on a remote network that gets its IP dynamically > from the ISP. I need to always know where that computer is. I had > thought that I could simply "scrape" it's public IP, have it sent to > my primary NS computer (which of course is on a static IP), then use > that information to keep a zone updated on our DNS. So, for example, > if my main domain for our company were: > > abc.com > > then it would be nice to have: > > remote.abc.com > > that I could use to always reach that machine no matter what its IP is. > > I'm sure this can be done, but can anyone explain in simple terms what > I need to do? > > Jeff > _______________________________________________ > bind-users mailing list > bind-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/bind-users -- . . ___. .__ Posix Systems - Sth Africa. e.164 VOIP ready /| /| / /__ m...@posix.co.za - Mark J Elkins, Cisco CCIE / |/ |ARK \_/ /__ LKINS Tel: +27 12 807 0590 Cell: +27 82 601 0496
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