: In the "Network" box, uncheck ED2K and ensure Kad is checked.

4.6 Privacy Enhancements

: There is no central point of failure; even if every server goes offline, Kad keeps running.

Since Kad is decentralized, your client needs an initial list of "known nodes" to find other users. Kad: Not connected - Synology Community

While many use both networks, running offers specific benefits:

When Alex loaded the file, his eMule didn’t connect to hundreds of servers. Instead, it connected to only a few, highly robust nodes that seemed to be superpeers. The search results were instantaneous. Every file was hashed correctly, every user was an enthusiast, not a bot.