To get new hosts, just listen for Pongs

And to check if someone is still alive, just connect (no use of doing these checks at other times - TCP connections are too expensive for that - and the turnaround rate too high).

some more detailed info: http://gnet-specs.gnufu.net

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The connected nodes don't need to be check use extra udp keep alive message,but I mean we know there are a local host list as you said gained from the pong message,so we also don't need to check if these nodes are still alive now?

the http://gnet-specs.gnufu.net still alive?It direct to the "http://wiki.limewire.org/index.php?title=GDF",right? But I can't find the detail of the detail of when we need use the ping/pong to gain the new hosts from that document.I just know the pong cache can gain hosts,but when to send ping of a node is not metioned in the document.

why I can't connect to it,can you send me saved html file of the document to me?