So what is LimeUDP ?

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udp enabled LW's? LW is using a new UDP crawler that more accurately measures netsize.

Ya, LW merged the two crawlers. The UDP crawler mostly report LWs because other clients aren't responding to the UDP crawl. I think the total host count is LW UDP crawl (takes 5 minutes) + LW tcp crawl (50 minutes) minus the duplicates IPs/2 and that make the new gnutella total.

Ciao

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That's true. For a number of reasons, it is not possible to crawl a network like Gnutella completely via TCP if your resources are limited, that's why LimeWire implemented an UDP crawler message a while ago. The ability to use UDP pings for crawling hosts has finally been added to the official crawler.

I still don't quite see, how LimeWire is calculating the total number of hosts, though, because:
unique leaves + ultrapeer count > total host count.

Of the LimeUDP hosts 4% are non-LimeWire according to my own crawl. Most of them are BearShare ultrapeers and LimeWire leaves but there are also a good number of GnucDNA hosts among them.