Thank you! What if I would like to use my own DNS server for this (considereing I've got my own domain names)?
On Dec 27, 2007 3:58 PM, Shane Geiger <[EMAIL PROTECTED]> wrote: > Marcelo de Moraes Serpa wrote: > > Hello list, > > > > I'd like to set up ssh access to my home computer so that I will be > > able to access it from work - for this no problem, installing sshd is > > straightforward. > > > > The issue here is that I don't have a fixed IP connection at home. > > Also, I wouldn't like to use services such as no-ip or similar. > > > > What I thought was of writing a python program that would detect when > > the internet network interface was restarted/started for the first > > time and then update a DNS record at my DNS server where I would have > > a subdomain that for my home machine's host. > > > > However, I have no idea on how I could detect if the network has been > > restarted nor how I could update this DNS record. Any suggestion would > > be greatly appreciated :) > > > > Thanks in advance, > > > > Marcelo. > > How to deal with networking depends on the system you use. For Debian: > > Debian uses ifupdown (see ifup(8), ifdown(8) and interfaces(5)) to > manipulate network interfaces. Each interface is provided with > several scripting hooks: pre-up, up, down, and post-down. These > hooks are available to each interface as in-line directives in > /etc/network/interfaces and also as *.d/ directories called with > run-parts (see run-parts(8)): > > /etc/network/if-up.d/ > /etc/network/if-pre-up.d/ > /etc/network/if-down.d/ > /etc/network/if-post-down.d/ > > > > > SETTING UP A DOMAIN NAME WITH DYNDNS.ORG > > Go to their site and set up an account. While doing that (or perhaps > after--I don't remember), you can choose a domain name. You *could* > think of what they are giving you is a subdomain--not actually a > domain. You will be able to choose something like foo.mine.nu where > "foo" is the name you choose for the name of your subdomain and > "mine.nu" is the domain they already own. (You can choose from many > domains they already own.) Since they manage these domains themselves, > they do not have to pay a registrar to set up a subdomain...and > therefore they can give you a subdomain for free. (Actually, I'm using > the term "subdomain" loosely here...but I'm sure you get the point I'm > trying to make--which is that you don't have to pay for this name.) > > Once you have your name (foo.mine.nu, for example), you can set up a > program on your computer to update their DNS servers with your new > domain name whenever it changes. > > -------------------------------------------------- > > > SETTING UP IPCHECK WITH DYNDNS.ORG > > I have been satisfied with my first choice (dyndns.org), so I haven't > tried the others. They probably work well, too. > > Set up an account on dyndns.org, and record the username, password, and > domain name in your notes. In the following examples, I use the > following values: > > username: sgeiger > pass: asdfasdf > domain name: sgeiger.mine.nu > > > apt-get install ipcheck > > You might want to run this first so that you are in the directory cron > will use when you run ipcheck: > sudo su; cd ~; > > HERE'S HOW TO CONFIGURE IT: > [EMAIL PROTECTED]:~$ sudo /usr/sbin/ipcheck.py -l -r > checkip.dyndns.org:8245 shanerg asdfasdf sgeiger.mine.nu > ipcheck.py: No ipcheck.dat file found. > ipcheck.py: Use same command+options ONCE with --makedat to create from > DNS lookup. > [EMAIL PROTECTED]:~$ sudo /usr/sbin/ipcheck.py --makedat -l -r > checkip.dyndns.org:8245 shanerg asdfasdf sgeiger.mine.nu > ipcheck.py: ip1 looking up sgeiger.mine.nu > ipcheck.py: result: 'sgeiger.mine.nu'[]['139.55.232.72'] > [EMAIL PROTECTED]:~$ sudo /usr/sbin/ipcheck.py -l -r > checkip.dyndns.org:8245 shanerg asdfasdf sgeiger.mine > .nu > [EMAIL PROTECTED]:~$ sudo /usr/sbin/ipcheck.py -l -r > checkip.dyndns.org:8245 shanerg asdfasdf sgeiger.mine.nu > [EMAIL PROTECTED]:~$ sudo /usr/sbin/ipcheck.py -l -r > checkip.dyndns.org:8245 shanerg asdfasdf sgeiger.mine.nu > [EMAIL PROTECTED]:~$ > > When you run this manually and it works you will see no output. > > To add a cron job to update this automatically once a day at 10 am: > > ### Note: This script should be run once a day from cron, like this > (which runs it at 10:15 am every day) > 15 10 * * * /usr/bin/python /usr/sbin/ipcheck.py -l -r > checkip.dyndns.org:8245 shanerg asdfasdf sgeiger.mine.nu > > > To add another names (foobar.mine.nu): > sudo /usr/sbin/ipcheck.py --makedat -l -r checkip.dyndns.org:8245 > shanerg rQ9ll0 sgeiger.mine.nu,foobar.mine.nu > > ...and then put this into the cron tab: > 15 10 * * * /usr/bin/python /usr/sbin/ipcheck.py -l -r > checkip.dyndns.org:8245 shanerg asdfasdf sgeiger.mine.nu > > > > > Check the mail messages on the computer you are using in case there were > errors. > > Note: This creates a file named /root/ipcheck.dat and /root/ipcheck.log > on my computer. > > > > > STEPS FOR ADDING ANOTHER HOST: > - add the host on dnydns.org > - run the script with makedat option > - run the script to update the server > > In the example below, ipcheck will update the dyndns.org servers for the > names "sgeiger.mine.nu" and for "myothername.mine.nu": > > [EMAIL PROTECTED]:/root$ sudo /usr/sbin/ipcheck.py --makedat -l -r > checkip.dyndns.org:8245 shanerg asdfasdf > sgeiger.mine.nu,sgeigerbot.mine.nu,myothername.mine.nu > ipcheck.py: There is already an ipcheck.dat file existing. > ipcheck.py: Remove this file first before running --makedat > [EMAIL PROTECTED]:/root$ sudo mv ipcheck.dat ipcheck.dat-old > [EMAIL PROTECTED]:/root$ sudo /usr/sbin/ipcheck.py --makedat -l -r > checkip.dyndns.org:8245 shanerg asdfasdf > sgeiger.mine.nu,sgeigerbot.mine.nu,myothername.mine.nu > ipcheck.py: ip1 looking up sgeiger.mine.nu > ipcheck.py: result: 'sgeiger.mine.nu'[]['139.55.233.228'] > ipcheck.py: ip2 looking up sgeigerbot.mine.nu > ipcheck.py: result: 'sgeigerbot.mine.nu'[]['139.55.233.228'] > ipcheck.py: ip2 looking up myothername.mine.nu > ipcheck.py: result: 'myothername.mine.nu'[]['139.55.233.228'] > [EMAIL PROTECTED]:/root$ > > > [EMAIL PROTECTED]:/nu/mine/myothername$ sudo crontab -l > 15 10 * * * /usr/sbin/ipcheck.py -l -r checkip.dyndns.org:8245 > shanerg asdfasdf sgeiger.mine.nu,sgeigerbot.mine.nu,myothername.mine.nu > --acctfile /root/ipcheck.dat > [EMAIL PROTECTED]:/nu/mine/myothername$ > > > > > > > > -- > Shane Geiger > IT Director > National Council on Economic Education > [EMAIL PROTECTED] | 402-438-8958 | http://www.ncee.net > > Leading the Campaign for Economic and Financial Literacy > >
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