我以前问过这个问题。我设置了一个服务器，为我的网站、dns 和一些游戏服务器提供服务。但是，当我检查路由器防火墙日志时，我发现很多传入的 UDP 数据包在同一端口上被阻止。它看起来是这样的，请注意端口不正常，没有打开或使用。
[INFO] Sat Aug 25 21:25:09 2012 Blocked incoming UDP packet from 176.212.55.166:49001 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:25:05 2012 Blocked incoming UDP packet from 186.227.20.17:21401 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:25:05 2012 Blocked incoming UDP packet from 117.203.8.239:14090 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:25:03 2012 Blocked incoming UDP packet from 77.35.1.215:49001 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:24:53 2012 Blocked incoming UDP packet from 90.180.165.121:10011 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:24:51 2012 Blocked incoming UDP packet from 190.51.167.28:22486 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:24:45 2012 Blocked incoming UDP packet from 159.224.93.23:25946 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:24:44 2012 Blocked incoming UDP packet from 176.212.55.166:49001 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:24:43 2012 Blocked incoming UDP packet from 62.63.214.200:62348 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:24:40 2012 Blocked incoming UDP packet from 43.244.112.201:45811 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:24:30 2012 Blocked incoming UDP packet from 78.8.169.255:1236 to 84.234.160.79:28018
[INFO] Sat Aug 25 21:24:30 2012 Blocked incoming UDP packet from 91.205.238.31:16672 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:24:29 2012 Blocked incoming UDP packet from 176.212.55.166:49001 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:24:19 2012 Blocked incoming UDP packet from 213.115.74.42:50839 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:24:13 2012 Blocked incoming UDP packet from 142.68.127.231:40886 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:24:09 2012 Blocked incoming UDP packet from 176.212.55.166:49001 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:59 2012 Blocked incoming UDP packet from 87.14.231.178:21360 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:56 2012 Blocked incoming UDP packet from 109.202.150.81:53385 to 84.234.160.79:28018
[INFO] Sat Aug 25 21:23:54 2012 Blocked incoming UDP packet from 83.183.5.227:53786 to 84.234.160.79:28015
[INFO] Sat Aug 25 21:23:53 2012 Blocked incoming UDP packet from 1.228.6.35:29826 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:23:49 2012 Blocked incoming UDP packet from 176.212.55.166:49001 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:42 2012 Blocked incoming UDP packet from 109.202.150.81:53371 to 84.234.160.79:28018
[INFO] Sat Aug 25 21:23:41 2012 Blocked incoming UDP packet from 84.90.108.176:49686 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:39 2012 Blocked incoming UDP packet from 186.178.118.94:10063 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:38 2012 Blocked incoming UDP packet from 217.122.204.212:41446 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:36 2012 Blocked incoming UDP packet from 82.33.127.120:18441 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:35 2012 Blocked incoming UDP packet from 81.19.46.234:1183 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:23:33 2012 Blocked incoming UDP packet from 94.69.159.219:63959 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:31 2012 Blocked incoming UDP packet from 83.68.239.193:21808 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:29 2012 Blocked incoming UDP packet from 176.212.55.166:49001 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:22 2012 Blocked incoming UDP packet from 109.202.150.81:53370 to 84.234.160.79:28018
[INFO] Sat Aug 25 21:23:21 2012 Blocked incoming UDP packet from 188.27.241.206:55403 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:20 2012 Blocked incoming UDP packet from 189.24.110.248:61712 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:23:13 2012 Blocked incoming UDP packet from 96.50.2.51:15432 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:09 2012 Blocked incoming UDP packet from 176.212.55.166:49001 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:03 2012 Blocked incoming UDP packet from 37.128.216.210:57785 to 84.234.160.79:28018
[INFO] Sat Aug 25 21:22:58 2012 Blocked incoming UDP packet from 115.37.98.215:24347 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:22:50 2012 Blocked incoming UDP packet from 23.24.147.209:28970 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:22:47 2012 Blocked incoming UDP packet from 86.11.74.217:45682 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:22:46 2012 Blocked incoming UDP packet from 201.249.81.218:42176 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:22:44 2012 Blocked incoming UDP packet from 176.212.55.166:49001 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:22:41 2012 Blocked incoming UDP packet from 78.36.218.169:25903 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:22:24 2012 Blocked incoming UDP packet from 176.212.55.166:49001 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:22:21 2012 Blocked incoming TCP packet from 86.100.65.148:58771 to 84.234.160.79:80 as RST:ACK received but there is no active connection
[INFO] Sat Aug 25 21:22:21 2012 Blocked incoming TCP packet from 86.100.65.148:58775 to 84.234.160.79:80 as RST:ACK received but there is no active connection
[INFO] Sat Aug 25 21:22:21 2012 Blocked incoming TCP packet from 86.100.65.148:58776 to 84.234.160.79:80 as RST:ACK received but there is no active connection
[INFO] Sat Aug 25 21:22:21 2012 Blocked incoming TCP packet from 86.100.65.148:58777 to 84.234.160.79:80 as RST:ACK received but there is no active connection
[INFO] Sat Aug 25 21:22:21 2012 Blocked incoming TCP packet from 86.100.65.148:58769 to 84.234.160.79:80 as RST:ACK received but there is no active connection
[INFO] Sat Aug 25 21:22:19 2012 Blocked incoming UDP packet from 201.80.163.51:40668 to 84.234.160.79:61767
请注意，被阻止的公共端口是“61767”，他们开始使用“14953”。而且它一直在通信，日志中得到的不止这些，所以我该怎么办？服务的开放端口是 1996：远程桌面、143：imap、110：pop3、25：smtp、80：http、443：https、53：dns。对于游戏服务器，我打开了 27000-27900 范围，因为我使用 Srcds 服务器来玩 Team Fortress 2。所以我该怎么办？它从昨天开始就一直在通信，为什么？不知道。
捕获一个 UDP 数据包 @ UDP 61767
00000000 64 31 3A 61 64 32 3A 69 64 32 30 3A 77 97 D9 57 d1:ad2:i d20:w..W
00000010 FD 9B 37 AD 46 7A 55 32 C8 81 04 A7 36 D9 CE E1 ..7.FzU2 ....6...
00000020 36 3A 74 61 72 67 65 74 32 30 3A 77 9D 1A BA E9 6:target 20:w....
00000030 FF 51 96 85 6E 0A 7C A6 FA 59 C0 69 40 37 36 65 .Q..n.|. .Y.i@76e
00000040 31 3A 71 39 3A 66 69 6E 64 5F 6E 6F 64 65 31 3A 1:q9:fin d_node1:
00000050 74 34 3A F2 0A 00 00 31 3A 76 34 3A 55 54 40 76 t4:....1 :v4:UT@v
00000060 31 3A 79 31 3A 71 65 1:y1:qe
数据包 2
00000000 64 31 3A 61 64 32 3A 69 64 32 30 3A A4 C6 64 B6 d1:ad2:i d20:..d.
00000010 60 41 16 2E 34 E3 71 0F 34 4B DE 45 DB 27 BE E4 `A..4.q. 4K.E.'..
00000020 39 3A 69 6E 66 6F 5F 68 61 73 68 32 30 3A 77 9D 9:info_h ash20:w.
00000030 1C A3 5B C9 67 67 97 1B 4D 4D D0 82 98 5F B8 6B ..[.gg.. MM..._.k
00000040 B2 7F 36 3A 6E 6F 73 65 65 64 69 31 65 36 3A 73 .6:nose edi1e6:s
00000050 63 72 61 70 65 69 31 65 34 3A 77 61 6E 74 6C 32 crapei1e 4:wantl2
00000060 3A 6E 34 32 3A 6E 36 65 65 31 3A 71 39 3A 67 65 :n42:n6e e1:q9:ge
00000070 74 5F 70 65 65 72 73 31 3A 74 32 3A D8 B2 31 3A t_peers1 :t2:..1:
00000080 76 34 3A 5A 6F 00 06 31 3A 79 31 3A 71 65 v4:Zo..1 :y1:qe
发布于 UTC 时间上午 02:24 + 01:00：看上去好像已经结束了，所以停下来就好了。
答案1
看起来像 BitTorrent 对等查询流量。
该系统可能已在跟踪器上注册 - BitTorrent 客户端是否有可能在该机器上运行（或者可能是通过 NAT 在它后面运行某些东西）？
顺便说一句，你的系统被要求的文件的哈希值在第二个数据包中。我将把找出它是什么文件的练习留给读者。