Dos Attack: Ack Scan

DOS attacks on end users are extremely rare - a hacker has nothing to gain from unleashing a DOS attack that will inconvenience one or two people, when the same resources can be used to target an ecommerce site or a government network, attacks that would have a much bigger impact, either financially or politically. Drop out and slow speed - DoS attack: ACK Scan For the last two day our Bigpond ADSL has been terrible with drop outs and unusable speeds. Looking at the log on my modem I find this (this is a small sample). IT was a solo dds by a nood that found your I.P. And tried to clog it. But a lone IP can do any kind of damage. You anoyed some kid, and he thought his L33T hacking software was going to do more than rapidly ping your server.

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Hi. As of the last month or so, I have been noticing very irregular problems with my internet connection. Sometimes at very random occasions, my computers internet is cut out. If I disable and re-enable my network LAN adapter, the problem automatically fixes itself. However, perhaps a day down the track or a few hours later, it may happen again. Lately the problem has been becoming increasingly abnormal. I've been noticing slower speeds on World of Warcraft (the online game I play) as well as random disconnects from it. I've also noticed as of late some disconnects from Ventrilo on its own (being unable to connect back to it for a couple of minutes). During these times, sometimes either all of the internet on my computer or simply some programs and websites wont load. (For example, during a time when I was getting extremely frequent disconnects from World of Warcraft, I was also finding it tough to get a good connection to the affiliated websites with the game).
Today I logged into my router and had a look at the logs, and noticed that there were alot of very unusual pieces of information which said 'DoS Attack'.
For example, here is

Dos Attack: Ack Scan Netgear

just a couple from the log:
[DoS Attack: RST Scan] from source: 174.1.185.198, port 49810, Wednesday, December 01,2010 10:55:46
[DoS Attack: RST Scan] from source: 72.187.176.59, port 3724, Wednesday, December 01,2010 10:55:07
[DoS Attack: RST Scan] from source: 68.14.157.42, port 44049, Wednesday, December 01,2010 10:54:52
[DoS Attack: RST Scan] from source: 24.92.108.20, port 3724, Wednesday, December 01,2010 10:54:29

What Does Dos Attack: Ack Scan Mean

[DoS Attack: RST Scan] from source: 71.83.93.144, port 50144, Wednesday, December 01,2010 10:54:16
Router[DoS Attack: RST Scan] from source: 173.19.248.60, port 3724, Wednesday, December 01,2010 10:54:13
[DoS Attack: ACK Scan] from source: 90.223.232.93, port 80, Wednesday, December 01,2010 09:22:53
[DoS Attack: ACK Scan] from source: 87.82.51.93, port 80, Wednesday, December 01,2010 09:22:45
[DoS Attack: RST Scan] from source: 138.108.22.10, port 80, Wednesday, December 01,2010 09:22:43
[DoS Attack: ACK Scan] from source: 87.82.51.93, port 80, Wednesday, December 01,2010 09:22:33
These ones below are all the same IP, not sure what that might mean:
[DoS Attack: RST Scan] from source: 138.108.22.10, port 80, Thursday, December 02,2010 09:54:38
[DoS Attack: RST Scan] from source: 138.108.22.10, port 80, Thursday, December 02,2010 09:44:37
[DoS Attack: RST Scan] from source: 138.108.22.10, port 80, Thursday, December 02,2010 09:34:37
[DoS Attack: RST Scan] from source: 138.108.22.10, port 80, Thursday, December 02,2010 09:24:37
There are MANY others. From what I can see, these all range from different IP addresses (except the last few) and I've no idea what it means. I do not understand if these issues are related or not. I have a Firewall turned on, as well as several anti virus. I can not confirm if the problem is localized to this PC. I've tried uninstalling and reinstalling ethernet drivers, resetting my router, etc. This however, does not explain why there are supposed DoS attacks in my router log and wether or not they are related. I am using Windows 7 64-Bit and a Netgear Router
If anyone could please help me, it would be great. This is really stressing me out and I am not sure wether or not to be worried.. Thankyou so much for your response

Edited by Arstone112, 02 December 2010 - 08:22 AM.

Hi. My internet has repetedly been going slow or 'shutting off' for small periods every now and then. I then looked into my router log and found that i'm getting constant DOS attacks.
[DoS Attack: ACK Scan] from source: 104.64.19.125, port 80, Monday, December 22, 2014 22:04:17
[DoS Attack: ACK Scan] from source: 104.64.19.125, port 80, Monday, December 22, 2014 22:03:28
[DoS Attack: ACK Scan] from source: 104.64.19.125, port 80, Monday, December 22, 2014 22:02:17
[DoS Attack: ACK Scan] from source: 104.64.19.125, port 80, Monday, December 22, 2014 22:01:28
[DoS Attack: ACK Scan] from source: 104.64.19.125, port 80, Monday, December 22, 2014 22:00:16
[DoS Attack: ACK Scan] from source: 104.64.19.125, port 80, Monday, December 22, 2014 21:59:35
[DoS Attack: ACK Scan] from source: 104.64.19.125, port 80, Monday, December 22, 2014 21:59:27
[DoS Attack: ACK Scan] from source: 104.64.19.125, port 80, Monday, December 22, 2014 21:58:16
[DoS Attack: ACK Scan] from source: 104.64.19.125, port 80, Monday, December 22, 2014 21:57:27
[DoS Attack: ACK Scan] from source: 104.64.19.125, port 80, Monday, December 22, 2014 21:56:16
[DoS Attack: ACK Scan] from source: 104.64.19.125, port 80, Monday, December 22, 2014 21:55:27
[DoS Attack: ACK Scan] from source: 104.64.19.125, port 80, Monday, December 22, 2014 21:54:16
[DoS Attack: ACK Scan] from source: 208.117.252.74, port 443, Monday, December 22, 2014 21:54:08
[DoS Attack: ACK Scan] from source: 104.64.19.125, port 80, Monday, December 22, 2014 21:53:27
[DoS Attack: ACK Scan] from source: 208.117.252.74, port 443, Monday, December 22, 2014 21:52:38
[DoS Attack: ACK Scan] from source: 104.64.19.125, port 80, Monday, December 22, 2014 21:52:16
[DoS Attack: ACK Scan] from source: 208.117.252.74, port 443, Monday, December 22, 2014 21:51:38
[DoS Attack: ACK Scan] from source: 104.64.19.125, port 80, Monday, December 22, 2014 21:51:27
[DoS Attack: ACK Scan] from source: 208.117.252.74, port 443, Monday, December 22, 2014 21:51:08
[DoS Attack: ACK Scan] from source: 104.64.19.125, port 80, Monday, December 22, 2014 21:50:15
[DoS Attack: ACK Scan] from source: 208.117.252.74, port 443, Monday, December 22, 2014 21:50:11
[DoS Attack: ACK Scan] from source: 104.64.19.125, port 80, Monday, December 22, 2014 21:50:08
[DoS Attack: ACK Scan] from source: 104.64.19.125, port 80, Monday, December 22, 2014 21:50:01
[DoS Attack: ACK Scan] from source: 208.117.252.74, port 443, Monday, December 22, 2014 21:49:58
[DoS Attack: ACK Scan] from source: 104.64.19.125, port 80, Monday, December 22, 2014 21:49:42
[DoS Attack: ACK Scan] from source: 216.58.218.192, port 443, Monday, December 22, 2014 21:37:23
[DoS Attack: ACK Scan] from source: 216.58.218.192, port 443, Monday, December 22, 2014 21:36:03
[DoS Attack: ACK Scan] from source: 208.117.252.146, port 443, Monday, December 22, 2014 21:34:41
[DoS Attack: ACK Scan] from source: 208.117.252.146, port 443, Monday, December 22, 2014 21:33:53
[DoS Attack: ACK Scan] from source: 208.117.252.146, port 443, Monday, December 22, 2014 21:32:53
[DoS Attack: ACK Scan] from source: 208.117.252.146, port 443, Monday, December 22, 2014 21:32:42
[DoS Attack: ACK Scan] from source: 208.117.252.146, port 443, Monday, December 22, 2014 21:31:53
[DoS Attack: ACK Scan] from source: 208.117.252.146, port 443, Monday, December 22, 2014 21:30:17
[DoS Attack: ACK Scan] from source: 208.117.252.146, port 443, Monday, December 22, 2014 21:29:59
[DoS Attack: ACK Scan] from source: 54.244.255.234, port 443, Monday, December 22, 2014 21:29:34
[DoS Attack: ACK Scan] from source: 96.16.7.83, port 80, Monday, December 22, 2014 21:28:45
[DoS Attack: ACK Scan] from source: 96.16.7.83, port 80, Monday, December 22, 2014 21:26:44
[DoS Attack: ACK Scan] from source: 96.16.7.83, port 80, Monday, December 22, 2014 21:24:44
[DoS Attack: ACK Scan] from source: 96.16.7.83, port 80, Monday, December 22, 2014 21:22:44
[DoS Attack: ACK Scan] from source: 216.137.43.253, port 80, Monday, December 22, 2014 20:41:37
[DoS Attack: ACK Scan] from source: 216.137.43.253, port 80, Monday, December 22, 2014 20:39:36
[DoS Attack: ACK Scan] from source: 216.137.43.253, port 80, Monday, December 22, 2014 20:37:36
[DoS Attack: ACK Scan] from source: 216.137.43.253, port 80, Monday, December 22, 2014 20:36:30
[DoS Attack: ACK Scan] from source: 216.137.43.253, port 80, Monday, December 22, 2014 20:35:56
[DoS Attack: RST Scan] from source: 67.21.106.230, port 55108, Monday, December 22, 2014 20:14:36
[DoS Attack: ACK Scan] from source: 17.172.232.88, port 5223, Monday, December 22, 2014 19:18:45
[DoS Attack: ACK Scan] from source: 17.172.232.88, port 5223, Monday, December 22, 2014 19:16:15
[DoS Attack: ACK Scan] from source: 17.172.232.88, port 5223, Monday, December 22, 2014 19:15:00
[DoS Attack: ACK Scan] from source: 17.172.232.88, port 5223, Monday, December 22, 2014 19:12:30
[DoS Attack: ACK Scan] from source: 17.172.232.88, port 5223, Monday, December 22, 2014 19:10:00
[DoS Attack: RST Scan] from source: 109.148.28.32, port 49272, Monday, December 22, 2014 18:24:34
[DoS Attack: TCP/UDP Chargen] from source: 173.242.112.113, port 55074, Monday, December 22, 2014 18:00:00
[DoS Attack: ACK Scan] from source: 207.46.101.12, port 443, Monday, December 22, 2014 15:37:51
[DoS Attack: TCP/UDP Chargen] from source: 93.180.5.26, port 45764, Monday, December 22, 2014 12:58:57
[DoS Attack: ACK Scan] from source: 68.142.123.254, port 80, Monday, December 22, 2014 12:45:58
[DoS Attack: ACK Scan] from source: 173.252.103.16, port 443, Monday, December 22, 2014 11:56:59
[DoS Attack: ACK Scan] from source: 173.252.103.16, port 443, Monday, December 22, 2014 11:53:13
[DoS Attack: ACK Scan] from source: 17.110.229.214, port 5223, Monday, December 22, 2014 11:46:56
[DoS Attack: ACK Scan] from source: 192.35.249.124, port 80, Monday, December 22, 2014 11:18:13
[DoS Attack: ACK Scan] from source: 192.35.249.124, port 80, Monday, December 22, 2014 11:17:09
[DoS Attack: ACK Scan] from source: 173.241.242.219, port 80, Monday, December 22, 2014 11:16:39
[DoS Attack: ACK Scan] from source: 192.35.249.124, port 80, Monday, December 22, 2014 11:16:05
[DoS Attack: ACK Scan] from source: 173.241.242.219, port 80, Monday, December 22, 2014 11:15:50
[DoS Attack: ACK Scan] from source: 192.35.249.124, port 80, Monday, December 22, 2014 11:15:33
[DoS Attack: ACK Scan] from source: 173.241.242.219, port 80, Monday, December 22, 2014 11:15:25
[DoS Attack: ACK Scan] from source: 31.13.74.16, port 80, Monday, December 22, 2014 10:47:59
[DoS Attack: ACK Scan] from source: 23.72.137.27, port 80, Monday, December 22, 2014 10:47:12
[DoS Attack: ACK Scan] from source: 31.13.74.16, port 80, Monday, December 22, 2014 10:47:12
[DoS Attack: ACK Scan] from source: 31.13.66.131, port 80, Monday, December 22, 2014 10:46:54
[DoS Attack: ACK Scan] from source: 23.72.137.27, port 80, Monday, December 22, 2014 10:46:43
[DoS Attack: ACK Scan] from source: 31.13.66.131, port 80, Monday, December 22, 2014 10:46:23
[DoS Attack: TCP/UDP Chargen] from source: 212.38.166.128, port 47636, Monday, December 22, 2014 10:45:09
[DoS Attack: ACK Scan] from source: 199.96.60.1, port 443, Monday, December 22, 2014 09:58:09
[DoS Attack: ACK Scan] from source: 17.172.239.11, port 5223, Monday, December 22, 2014 09:46:08
[DoS Attack: RST Scan] from source: 72.26.216.251, port 22, Monday, December 22, 2014 09:11:54
[DoS Attack: ACK Scan] from source: 17.110.228.222, port 5223, Monday, December 22, 2014 07:45:13
[DoS Attack: TCP/UDP Chargen] from source: 212.38.166.128, port 42914, Monday, December 22, 2014 06:49:44
[DoS Attack: ACK Scan] from source: 207.46.101.12, port 443, Monday, December 22, 2014 05:46:44
[DoS Attack: ACK Scan] from source: 17.110.229.85, port 5223, Monday, December 22, 2014 05:44:21
[DoS Attack: ACK Scan] from source: 207.46.101.12, port 443, Monday, December 22, 2014 05:15:51
[DoS Attack: ACK Scan] from source: 207.46.101.12, port 443, Monday, December 22, 2014 04:39:46
[DoS Attack: ACK Scan] from source: 17.172.239.58, port 5223, Monday, December 22, 2014 03:43:30
[DoS Attack: ACK Scan] from source: 207.46.101.12, port 443, Monday, December 22, 2014 03:31:22
[DoS Attack: ACK Scan] from source: 207.46.101.12, port 443, Monday, December 22, 2014 02:03:10
[DoS Attack: ACK Scan] from source: 17.172.238.31, port 5223, Monday, December 22, 2014 01:42:38
[DoS Attack: ACK Scan] from source: 207.46.101.12, port 443, Monday, December 22, 2014 01:31:34
[DoS Attack: ACK Scan] from source: 17.172.239.117, port 5223, Sunday, December 21, 2014 23:42:26
[DoS Attack: TCP/UDP Chargen] from source: 74.82.47.5, port 55458, Sunday, December 21, 2014 21:37:12
[DoS Attack: ACK Scan] from source: 208.117.255.148, port 443, Sunday, December 21, 2014 21:05:58
[DoS Attack: ACK Scan] from source: 208.117.255.148, port 443, Sunday, December 21, 2014 21:05:28
[DoS Attack: ACK Scan] from source: 208.117.255.148, port 443, Sunday, December 21, 2014 21:04:58
[DoS Attack: ACK Scan] from source: 208.117.255.148, port 443, Sunday, December 21, 2014 21:03:58
[DoS Attack: ACK Scan] from source: 208.117.255.148, port 443, Sunday, December 21, 2014 21:03:28
[DoS Attack: ACK Scan] from source: 208.117.255.148, port 443, Sunday, December 21, 2014 21:02:28
[DoS Attack: ACK Scan] from source: 208.117.255.148, port 443, Sunday, December 21, 2014 21:01:59
[DoS Attack: ACK Scan] from source: 173.241.244.220, port 80, Sunday, December 21, 2014 19:47:31
[DoS Attack: ACK Scan] from source: 173.241.244.221, port 80, Sunday, December 21, 2014 19:47:09
[DoS Attack: ACK Scan] from source: 173.241.244.220, port 80, Sunday, December 21, 2014 19:47:00
[DoS Attack: ACK Scan] from source: 173.241.244.221, port 80, Sunday, December 21, 2014 19:46:31
[DoS Attack: ACK Scan] from source: 173.241.244.220, port 80, Sunday, December 21, 2014 19:45:11
[DoS Attack: ACK Scan] from source: 173.241.244.220, port 80, Sunday, December 21, 2014 19:44:20
[DoS Attack: ACK Scan] from source: 69.194.250.248, port 8000, Sunday, December 21, 2014 19:44:07
[DoS Attack: ACK Scan] from source: 173.241.244.220, port 80, Sunday, December 21, 2014 19:43:53
[DoS Attack: ACK Scan] from source: 69.194.250.248, port 8000, Sunday, December 21, 2014 19:43:19
[DoS Attack: ACK Scan] from source: 69.194.250.15, port 8000, Sunday, December 21, 2014 19:26:21
[DoS Attack: ACK Scan] from source: 69.194.250.157, port 8000, Sunday, December 21, 2014 19:23:55
[DoS Attack: ACK Scan] from source: 69.194.250.246, port 8000, Sunday, December 21, 2014 19:23:55
[DoS Attack: ACK Scan] from source: 69.194.250.157, port 8000, Sunday, December 21, 2014 19:23:30
[DoS Attack: ACK Scan] from source: 69.194.250.246, port 8000, Sunday, December 21, 2014 19:23:29
[DoS Attack: ACK Scan] from source: 69.194.250.157, port 8000, Sunday, December 21, 2014 19:23:17
[DoS Attack: ACK Scan] from source: 69.194.250.246, port 8000, Sunday, December 21, 2014 19:23:17
[DoS Attack: ACK Scan] from source: 69.194.250.157, port 8000, Sunday, December 21, 2014 19:23:10
[DoS Attack: ACK Scan] from source: 69.194.250.246, port 8000, Sunday, December 21, 2014 19:23:10
[DoS Attack: ACK Scan] from source: 69.194.250.157, port 8000, Sunday, December 21, 2014 19:23:07
[DoS Attack: ACK Scan] from source: 69.194.250.246, port 8000, Sunday, December 21, 2014 19:23:07
[DoS Attack: RST Scan] from source: 211.138.34.58, port 56377, Sunday, December 21, 2014 16:37:28
[DoS Attack: RST Scan] from source: 46.20.12.10, port 80, Sunday, December 21, 2014 13:42:30
[DoS Attack: ACK Scan] from source: 31.13.65.7, port 443, Sunday, December 21, 2014 13:13:33
[DoS Attack: ACK Scan] from source: 31.13.65.7, port 443, Sunday, December 21, 2014 13:11:50
[DoS Attack: RST Scan] from source: 37.247.104.186, port 80, Sunday, December 21, 2014 12:59:26
[DoS Attack: TCP/UDP Chargen] from source: 104.192.0.20, port 48478, Sunday, December 21, 2014 11:31:57
[DoS Attack: ACK Scan] from source: 207.46.101.12, port 443, Sunday, December 21, 2014 07:57:35
[DoS Attack: RST Scan] from source: 185.38.12.21, port 8501, Sunday, December 21, 2014 07:01:39
[DoS Attack: TCP/UDP Chargen] from source: 91.236.74.139, port 54365, Saturday, December 20, 2014 23:22:42
[DoS Attack: TCP/UDP Chargen] from source: 93.180.5.26, port 49564, Saturday, December 20, 2014 23:10:26
[DoS Attack: ACK Scan] from source: 207.46.101.12, port 443, Saturday, December 20, 2014 22:34:31
[DoS Attack: TCP/UDP Chargen] from source: 74.82.47.25, port 41696, Saturday, December 20, 2014 21:57:13
[DoS Attack: ACK Scan] from source: 54.230.7.230, port 80, Saturday, December 20, 2014 21:41:00
[DoS Attack: ACK Scan] from source: 185.60.216.7, port 443, Saturday, December 20, 2014 16:18:41
[DoS Attack: ACK Scan] from source: 185.60.216.7, port 443, Saturday, December 20, 2014 16:18:28
[DoS Attack: ACK Scan] from source: 185.60.216.7, port 443, Saturday, December 20, 2014 16:17:51
[DoS Attack: ACK Scan] from source: 68.232.35.82, port 80, Saturday, December 20, 2014 16:00:39
[DoS Attack: ACK Scan] from source: 68.232.35.82, port 80, Saturday, December 20, 2014 15:58:38
[DoS Attack: ACK Scan] from source: 68.232.35.82, port 80, Saturday, December 20, 2014 15:57:25
[DoS Attack: ACK Scan] from source: 68.232.35.82, port 80, Saturday, December 20, 2014 15:56:48
[DoS Attack: ACK Scan] from source: 72.21.91.113, port 80, Saturday, December 20, 2014 15:29:25
[DoS Attack: ACK Scan] from source: 72.21.91.113, port 80, Saturday, December 20, 2014 15:28:51
[DoS Attack: RST Scan] from source: 46.105.241.161, port 25565, Saturday, December 20, 2014 12:15:12
[DoS Attack: ACK Scan] from source: 54.192.7.12, port 80, Saturday, December 20, 2014 12:06:35
[DoS Attack: ACK Scan] from source: 23.75.217.231, port 80, Saturday, December 20, 2014 11:28:52
[DoS Attack: ACK Scan] from source: 198.54.12.96, port 80, Saturday, December 20, 2014 11:27:09
[DoS Attack: ACK Scan] from source: 23.75.217.231, port 80, Saturday, December 20, 2014 11:26:52
[DoS Attack: ACK Scan] from source: 31.13.70.17, port 443, Saturday, December 20, 2014 11:26:15
[DoS Attack: ACK Scan] from source: 198.45.55.191, port 80, Saturday, December 20, 2014 11:26:09
[DoS Attack: ACK Scan] from source: 198.54.12.96, port 80, Saturday, December 20, 2014 11:26:05
[DoS Attack: ACK Scan] from source: 198.45.55.191, port 80, Saturday, December 20, 2014 11:25:13
[DoS Attack: ACK Scan] from source: 23.75.217.231, port 80, Saturday, December 20, 2014 11:25:07
[DoS Attack: ACK Scan] from source: 198.45.55.191, port 80, Saturday, December 20, 2014
11:25:04
[DoS Attack: ACK Scan] from source: 198.54.12.96, port 80, Saturday, December 20, 2014 11:25:01
[DoS Attack: ACK Scan] from source: 198.45.55.191, port 80, Saturday, December 20, 2014 11:24:58
[DoS Attack: ACK Scan] from source: 69.172.216.56, port 80, Saturday, December 20, 2014 11:24:56
These periods of slow internet have been going on for about 3 days and it shows in the log. What are the proper steps i should take to fix this? I'm currently doing a malwarebytes scan and nothing is showing up.