Sometimes, due to new settings on your home router or a simple reboot, you may need to access the site noip.com and manually change your IP address. This can be problematic if you are far away from your router and unable to find out the address.
While routers have a function for free domains, this may not always work or may only work in one domain zone. For example, the stock firmware d-link dir320 is not very flexible or rich in terms of configuration. However, the noip service provides an excellent API that can be used in a variety of situations and scenarios, both on a regular PC and on a server.
Here is a script that accesses the 2ip website to parse your IP address, remembers it, and then uses it in the noip API to update your address. The script can be saved as "noip.py" and run with Python. We can then add it to our cron job for automatic updates.
import re, urllib
if __name__ == "__main__":
web_page = urllib.urlopen("https://2ip.ru")
web_page = web_page.read()
ip = re.findall("(\d+\.\d+\.\d+\.\d+)", web_page)[0]
username = 'YOUR EMAIL'
password = 'YOUR SERVICE PASSWORD'
host = 'YOUR HOST, BY THE TYPE OF THIS blog.bounceme.net '
update = urllib.urlopen("https://"+str(username)+":"+str(password)+
"@dynupdate.no-ip.com/nic/update?hostname="+str(host)+"&myip="+ ip)
res = update.read()
if re.match("(good)|(nochg)", res):
print 'ok'
else:
print 'error\n' + res
This incident occurred yesterday. There is remote access to the internal network via VPN on the ASA, but it is only available during certain hours. Some people need access outside of these hours, but only the main gateway is available and people usually do not have a white IP. To solve this issue, a temporary scheme was implemented where an employee has a DDNS router and a script on the gateway updates the current IP address for login permissions.
However, last night, a lady was unable to access the network despite having the correct address. Attempts were made to diagnose the issue by checking logs and pinging the gateway from the user's computer, but the issue persisted. It was discovered that the address given by 2ip was actually the old address, which caused confusion and frustration. Ultimately, restarting the router and script resolved the problem.
In situations like this, it's important to be diligent in troubleshooting and not overlook any inconsistencies or red flags, regardless of how insignificant they may seem at first.
I see the utility of automating IP address updates using the No-IP API, especially when dealing with static IP issues on consumer-grade routers. However, the script you've provided has some notable shortcomings. Firstly, using urllib is outdated; modern Python environments should leverage requests for better error handling and cleaner syntax. Moreover, hardcoding credentials directly into the script poses a significant security risk.
Consider using environment variables or a configuration file to manage sensitive information securely. Lastly, the reliance on regex for IP parsing can be fragile - it's better to use libraries like ipaddress for robustness. While the script serves its purpose, it could benefit from these enhancements to ensure better maintainability and security.