How to set destination IP address



  • I have a synology storage device. I set up DDNS on it. I had to open up outbound ports 53 and 80 so the DDNS would work correctly.

    So the only web address the synology needs to access is the DDNS web address of "no-ip.com". How can I set up the DDNS outbound destination address in the rules so that the firewall only allows connections to this address over port 80?

    Basically, how to change destination address from "any" to "no-ip.com"?


  • Rebel Alliance Developer Netgate

    You could make an alias, and use the no-ip.com hostname in there, but depending on how their site is setup, their hostname may resolve to several IPs and change around at any time, so it may work fine, or sporadically.

    If you really want to filter that, you would need to setup an http proxy (squid) and something (like squidguard) to enforce access by the URL being contacted. Though that could interfere with the dyndns process.



  • @jimp:

    You could make an alias, and use the no-ip.com hostname in there, but depending on how their site is setup, their hostname may resolve to several IPs and change around at any time, so it may work fine, or sporadically.

    If you really want to filter that, you would need to setup an http proxy (squid) and something (like squidguard) to enforce access by the URL being contacted. Though that could interfere with the dyndns process.

    Guess there is not a 100% solution. Thanks for taking the time to answer my question.


Log in to reply