53.5. Broadcasting and Scanning for Servers

If you have a large number of Webmin servers on your network, adding them one by one to this module can be tedious. There is a better way though. The master system can broadcast on your local LAN for other Webmin servers or send requests to hosts within a specific network to probe for servers. Any servers that are found will be automatically added to this module, although only in Normal link to server mode. There is no way for the master system to automatically determine a login and password for a remote system—this would be a huge security hole if it were possible!

To find other Webmin servers, follow these steps:

1.
If you only want to search your local LAN, click on the Broadcast for servers button at the bottom of the module's main page.

To search another network, enter its address into the field to the right of the Scan for servers button before hitting it. This must be a class C network, entered like 192.168.1.0.

2.
A page listing the URLs of servers that are found will be displayed. New ones will have Found new server before their URLs, those already on the main page will have Found known server, and responses from the master system itself will have Found this server.

3.
When the process is complete, you can return to the main page, which will now contain an extra icon for each of the newly found servers. They can then be edited to switch to Login via Webmin with username mode to use them for RPC.

All versions of Webmin since 0.75 listen on UDP port 10000 for the broadcast and scan packets sent out by this module, and reply with their hostname, port number, and SSL mode. A server will not be found if a firewall is blocking this port or if UDP listening has been turned off for security reasons.

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