[TriLUG] DDNS (and maybe DHCP) on host not router

[James c. Jones]

Zoneedit's dynamic dns service says the following will work to update
their dynamic dns name server for a linux environment.

wget -O - --http-user=username --http-passwd=password
'http://dynamic.zoneedit.com/auth/dynamic.html?host=www.mydomain.com'

jc jones

Randy Barlow wrote:
> Tom Roche wrote:
>   
>> Right, but in the PN above, it *is* the router that's getting the IP#,
>> so it's the router which needs its DNS record updated when its IP#
>> changes, so it's the router that needs the dyndns update client ...
>> no? (At least, that's how I understand RR's Surfboards to work--they
>> give 1 IP# to 1 attached device, and if you change the device you've
>> gotta powercycle the modem.) And won't that be the case whenever the
>> router is firewalling?
>>     
>
> You are correct that it is the router that gets the IP, but it doesn't
> have to be the router to run the update client (though it can be).  It
> is possible for devices on the private network to determine the public
> IP of that router.  Actually, you can see that for yourself - go to
> http://whatismyipaddress.com and you will see your public IP, even if
> you are on a machine on the PN.  I think the DynDNS update script works
> similarly.
>
>