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[dummy00001]

When you opened the ports in your firewall, are you sure you opened them for UDP as well as TCP?

Yes. Actually Mac OS X doesn't provide an option to open only TCP or UDP. It always opens both TCP and UDP ports for any given range.

Is your LinkSys performing Network Address Translation? Is it forwarding the UDP ports as well as the TCP ports to the iBook?

Yes. I have DMZ, so everything sent to router - and not prohibited by router's firewall -  is automatically redirected to my iBook. (Prohibited is only SMB/CIFS/NetBIOS - I have had Windoz clients connected to router some time ago). And vice versa, everything originating from my IP to Internet address is sent over inet interface.

Using Ethereal, have you been able to see any UDP ed2k traffic from your iBook to any of the servers other than the one to which you are connected? Have you seen any responses from those servers back to your iBook?

From a sample of 10k packets (4+ minutes of capture), I got about 180 UDP packets.
Split is about 50/50: half of them seems to be p2p communication ("emule extension reask file ping" as ethereal identify them) and half for server status request/status (plus server info responses). IPs are all different. I assume that that this is to/from different servers.
So yes, I'm seeing responses from other clients/servers.

Shall I make longer traces? - I believe aMule has five minute delay between searches. I understood your question more as a question do I really have High ID.

P.S. I'm finished with rare files for now. I have only left in queue quite popular ones. Does it make any difference?

[ken]

OK, thanks for all those answers.  I'm sure I was just being dense in not understanding your previous answers (e.g. not fully understanding what DMZ implies), so I appreciate your very clear answers here.  

Unfortunately, we haven't found any explanation for why you were having such a hard time with your rare files before.  Of course, ideally we would like to identify and eliminate such problems.  On the other hand, if you're no longer experiencing them, then there's no point in troubling you further.  Thanks, anyway.

[dummy00001]

It seems that problem has cured by connecting from server with 10k users to one with 100k (RazorBack2).

Well, at least I hope it is cured. In my latest experiments I have seen no problems - but recently I was downloading relatively popular files.

As soon as I will find some files which will turn out to be rare - watch me whining on forums again

P.S. Is Kad support planned? if yes when? is there any aMule betas with Kad?

[dummy00001]

Hm. Having said that, I hope that better solution can be found - network-wise.
If performance of download depends so much on server we are connected to, then network would split, if the big servers will go off line.
That's why asked about Kademlia - server-less network.

[ken]

Originally posted by dummy00001
P.S. Is Kad support planned? if yes when? is there any aMule betas with Kad?

Yes.  "Soon".  Not yet.  

[dummy00001]

Seems I'm getting closer to the problem.

Server, replying to GetSources, never sends A4AF sources: same source will never be listed twice in reply. This was my observation. And it happens that I'm downloading lots of rare files which are hosted by few peoples. Say, 5 files by 5 people. aMule sends jumbo request for sources for 5 files and receives only 5 sources, but server associates them only to one of the files. So one file gets five sources, other four files sits in red without sources.

I have just added five new downloads: BBC's Radio 3 put out Beethoven's symphonies for free download, but only over unrestartable HTTP. I guessed that it wouldn't take long for files to appear on eDonkey network and yes here they are. I have found them by name and added them: only got sources for one file -  about 80 - and it was downloaded in one hour or so. Others remained in red. After first one was finished, another download got again almost all of the 80 sources. Few sources get dispersed to remaining three files.

Such behavior (observed in many other similar situations) seems to be some sort of confirmation for my theory.

Is it possible to activate some sort of randomization for GetSources request sent to server? Or ask sources about the possibility that they have some other files I'm interested in?

Anyway, I'd rather have files with bulk of A4AF sources and no progress rather than file with no sources at all and no progress.

[ken]

I think it is by design that the server only provides a given source once.  In theory, source sharing with those sources will reveal that they are sources for your other files, too.  Do you have the extended eMule protocol UDP port enabled?

Also, what are your source dropping settings?

[dummy00001]

High ID.
UDP is enabled.
Source dropping is disabled.