DDNS

When a server is behind a firewall I want to know when the server's public IP address changes, and to communicate it back to my DNS servers at dns.he.net.

I need to know the outside IP address, not the private IP address of the server itself.

DDNS on Debian servers

HE.net part: Create a key. You have to create a key on the DNS server so that it will trust updates coming from the Debian server.

1. Log into dns.he.net
2. Go to the appropriate domain
3. Click on the entry for the server (create one if it does not exist)
4. Check the box "Enable entry for dynamic DNS. This will also clear the current IP address and set TTL to 5 minutes.
5. Click Update.
6. There will now be a "recycle" type icon for the entry. Click on it to either enter a key or generate a random key.

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