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[crazycortez]

Hi there,

I'm running aMule 2.1.3 on my Debian 3.1 box. I'm connected to the Internet through an ADSL modem and a router. My router is given a static IP address by my ISP.

It's now been several weeks that I can't connect to any ed2k servers. Of course, my first idea was to check my TCP & UDP ed2k ports to see whether they are firewalled or not. After checking, they are not. Just to be sure, I also try to connect my box to the Internet using only my ADSL modem, without the router, but the results were the same.

Then I run ethereal to look at the network traffic. Here is the result (my local IP is 192.168.1.2 and I was trying to connect to 62.241.53.2:8080) :

Code: [Select]

No.     Time        Source                Destination           Protocol Info
      1 0.000000    192.168.1.2           62.241.53.2           TCP      32780 > webcache [SYN] Seq=0 Ack=0 Win=5840 Len=0 MSS=1460 TSV=4294893095 TSER=0 WS=0
      2 0.075042    62.241.53.2           192.168.1.2           TCP      webcache > 32780 [SYN, ACK] Seq=0 Ack=1 Win=5840 Len=0 MSS=1412
      3 0.075109    192.168.1.2           62.241.53.2           TCP      32780 > webcache [ACK] Seq=1 Ack=1 Win=5840 Len=0
      4 0.081854    192.168.1.2           62.241.53.2           eDonkey  eDonkey TCP: Hello
      5 0.169593    62.241.53.2           192.168.1.2           TCP      30801 > 18662 [SYN] Seq=0 Ack=0 Win=5840 Len=0 MSS=1412
      6 0.169644    192.168.1.2           62.241.53.2           TCP      18662 > 30801 [SYN, ACK] Seq=0 Ack=1 Win=5840 Len=0 MSS=1460
      7 0.247512    62.241.53.2           192.168.1.2           TCP      30801 > 18662 [ACK] Seq=1 Ack=1 Win=5840 Len=0
      8 3.081276    192.168.1.2           62.241.53.2           eDonkey  [TCP Retransmission] eDonkey TCP: Hello
      9 9.080362    192.168.1.2           62.241.53.2           eDonkey  [TCP Retransmission] eDonkey TCP: Hello
     10 21.078538   192.168.1.2           62.241.53.2           eDonkey  [TCP Retransmission] eDonkey TCP: Hello
     11 25.478962   192.168.1.2           62.241.53.2           TCP      32780 > webcache [FIN, ACK] Seq=71 Ack=1 Win=5840 Len=0

Packet #4 doesn't get any answer (not even a TCP ACK). That's the problem, but I still don't know the reason...

Then I tried to connect the same machine to the Internet through a good old 56k modem. Note that I didn't get my usual static IP address, but a dynamic one. I run ethereal and amule again and this time I was able to connect to the server without any problem. Here is the log :

Code: [Select]

No.     Time        Source                Destination           Protocol Info
      1 0.000000    62.147.106.204        62.241.53.2           TCP      34644 > webcache [SYN] Seq=0 Ack=0 Win=5840 Len=0 MSS=1460 TSV=10527456 TSER=0 WS=0
      2 0.152104    62.241.53.2           62.147.106.204        TCP      webcache > 34644 [SYN, ACK] Seq=0 Ack=1 Win=5840 Len=0 MSS=1460
      3 0.152163    62.147.106.204        62.241.53.2           TCP      34644 > webcache [ACK] Seq=1 Ack=1 Win=5840 Len=0
      4 0.155939    62.147.106.204        62.241.53.2           eDonkey  eDonkey TCP: Hello
      5 0.317727    62.241.53.2           62.147.106.204        TCP      webcache > 34644 [ACK] Seq=1 Ack=71 Win=5840 Len=0
      6 0.328292    62.241.53.2           62.147.106.204        TCP      40606 > 18662 [SYN] Seq=0 Ack=0 Win=5840 Len=0 MSS=1460
      7 0.328342    62.147.106.204        62.241.53.2           TCP      18662 > 40606 [SYN, ACK] Seq=0 Ack=1 Win=5840 Len=0 MSS=1460
      8 0.476160    62.241.53.2           62.147.106.204        TCP      40606 > 18662 [ACK] Seq=1 Ack=1 Win=5840 Len=0
      9 0.682573    62.241.53.2           62.147.106.204        TCP      40606 > 18662 [PSH, ACK] Seq=1 Ack=1 Win=5840 Len=64
     10 0.682613    62.147.106.204        62.241.53.2           TCP      18662 > 40606 [ACK] Seq=1 Ack=65 Win=5840 Len=0
     11 0.694559    62.147.106.204        62.241.53.2           TCP      18662 > 40606 [PSH, ACK] Seq=1 Ack=65 Win=5840 Len=100
     12 0.890119    62.241.53.2           62.147.106.204        TCP      40606 > 18662 [ACK] Seq=65 Ack=101 Win=5840 Len=0
     13 0.894713    62.241.53.2           62.147.106.204        TCP      40606 > 18662 [FIN, ACK] Seq=65 Ack=101 Win=5840 Len=0
     14 0.895706    62.147.106.204        62.241.53.2           TCP      18662 > 40606 [FIN, ACK] Seq=101 Ack=66 Win=5840 Len=0
     15 1.068737    62.241.53.2           62.147.106.204        eDonkey  eDonkey TCP: Server Message[Unreassembled Packet]

So... it's a mystery to me. It looks like my ADSL connection doesn't let me connect to an ed2k server anymore. Could it be that my static IP address is blacklisted somewhere ? What other reason could it be ?

Any idea/suggestion would be greatly appreciated.

Thanks.

Regards,
Patrick

[wuischke]

Welcome Patrick!

Blame your provider (free.fr) for using package filtering. This can be circumvented by using protocol obfuscation, but: aMule does currently not support this. (It will be implemented somewhen in the near future.) On Linux you can use eMule 0.47c with wine, even though it's an unlovely solution.

[crazycortez]

Great ! It works.

Does anybody know the packet filtering policy of this provider ? Does it filter out all the customers with static IP addresses ? all the ADSL customers ? At least I was able to connect with a 56k modem using the same provider...

Thanks a lot !

Patrick

[wuischke]

Afaik there are all ADSL customers affected. There are other free.fr-users who asked at the forums.