On Wed, Jan 02, 2002 at 10:24:43AM -0800, gabriel wrote:
> this really should be easy... i'm thinking of doing away with my static ip
> since it costs so much. but this means that i won't be able to just
> memorise a single string of numbers when i want to ftp into my box from work
> etc.
DNS is you friend.
> so i'm wondering:
> could someone show me an example of a script i could use that would get the
> ip of my machine and email it to me on a daily basis?
Well, you could do something like:
IFCONFIG="/sbin/ifconfig -i eth1"
[EMAIL PROTECTED]
CUR_IP=`$IFCONFIG | grep "inet addr" | cut -f2 -d':' | sed -e "s/ .*//"`;
cat <<! | mail -s "IP ADDRESS" $MAILTO
Current IP: $CUR_IP
!
> is there an easier way?
> what about dynamic dns? what is that?
Got it in one. DNS registration allows you to associate your IP
with a domain name. Unfortunately, if you use DHCP this may change,
although most providers won't do so unless your machine is shutdown or
loses connectivity, and most won't even then. On both DSL and cable,
I've had the same DHCP assigned address for months on end--in fact,
on neither DirecTV (nee Telocity) nor AT&T Cable did I ever have a
reassignment of my IP. Plus, I've administrative rights to my primary
and secondary DNS servers, anyway. Thus, I've dealt with traditional DNS,
and written scripts that run periodically on my system to check for changes
in IP on the network interface with respect to my DNS zone files.
Dynamic DNS simply allows your system to submit IP changes to your DNS
server automatically on IP reassignment. This will usually result in
a short period of service interruption while all the cached nameservers
expire and update your records--either you, or the dynamic DNS provider,
want short timeouts to minimize this outage. There are both commercial
and free organizations offering dynamic DNS; it's typically inexpensive,
even if you pay for it, and there are reports that service reliability
from the free services can range from very good to questionable.
Check out www.dyndns.com--hmm, I see they've stopped accepting
new accounts until they can comfortably handle the new load--or
www.dyndns.org, which is a different organization, despite the similarity
of names. Do a Google search with keywords "dynamic DNS free", if you
want to find other free providers, or leave off the 'free' keyword if you
don't care.
G'luck, and have fun,
--
Dave Ihnat
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