Help. Dynamic DNS problem. I'm back.

danielwang · Post by **danielwang** » Fri Dec 06, 2002 11:20 pm

Is there a dynamic DNS service availible that let's you do DDNS (RFCrap 3121?) RR(A) updates without a client? I need to have dynamic DNS that updates in real time and does not require logon...

My IP changes all too frequently. I have a ISP DNS, but they do not support other DNS names and they are not publicly accessible, therefore I cannot do NS record or AXFR to them.

I dont want to have to set up an AT Schedule (cron) service for this... I already have a GrabURL service set up but it only updates every 6 hours... not good enough.
Any ideas? My connection keeps getting dropped when there are like 7 battles and if the packet loss isn't enough, if I have downtime (any sysadmin can tell you) what happens when you get DOWNTIME.

THANKS!
Daniel Wang (finally returned)

trythil · Post by **trythil** » Fri Dec 06, 2002 11:38 pm

No. DNS propagation time is not only a function of the client, but also of every other DNS server on the Internet. Updates are never broadcasted in real-time -- that would just be a mess. Given the way that DNS servers share data, you will never, ever, ever get a real-time update for resource records.

Get a real static IP.

Dynamic DNS is also not embodied in any RFC. RFC 3121 deals with standardizing resource names for information description systems, like XML.

danielwang · Post by **danielwang** » Sat Dec 07, 2002 1:59 am

Ok, thanks for your insight!
I'll consider asking for a real IP, though ISPs are funny on that...

Update specs: Actually I think it's RFCrud (what a generic name) 2136, which allows clients to send in standard Resource Record Update requests, this is the thing that's built into Windows.... the RFCrud also specs a bunch of crypto, TKEY I think, to allow secure updates, which I can't figure out yet...

Forcing broadcast: I'm currently trying to set my Resource Record time-to-live to a very, very, short period, and force immediate replication of the propogation data. but I can't seem to find the option and the DNS server insists it is at least a few hours.

Which means if my modem disconnects right after the service updates the DNS, I could be screwed for over half a day at worst. Oops.