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DSL connection goes down again and again

By malikalam ·
Dear all, for couple of weeks I am having trouble with my optus dsl internet connection. I have Netgear Wireless-G Modem Router DG834G and brand new. A windows Server 2003 is directly connected with ethernet cable and there are 4 wirelessly connected PCs. For last two weeks, internet connection disconects automatically and I have to Repair each time may be after 1 hr, 2 hr, 10min or after 1 day whenever its disconnects.
I have called Optus support for 5-6 times and they told me that there is no connection drop from our side. I have maintained Log today in Router Interface as well. Here is details:

[Admin login] from source 192.168.0.2, Wednesday, May 13,2009 06:50:14
[Admin login] from source 192.168.0.2, Wednesday, May 13,2009 06:39:38
[Admin login failure] from source 192.168.0.2, Wednesday, May 13,2009 06:39:28
[DHCP IP: (192.168.0.12)] to MAC address 00:18:4D:D6:4A:30, Wednesday, May 13,2009 05:52:37
[DHCP IP: (192.168.0.12)] to MAC address 00:18:4D:D6:4A:30, Wednesday, May 13,2009 05:52:05
[DOS Attack] : 1 [FIN Scan] packets detected in last 20 seconds, source ip [198.142.23.79]
Wednesday, May 13,2009 05:38:41
[DHCP IP: (192.168.0.5)] to MAC address 00:0F:1F:66:81:2D, Wednesday, May 13,2009 04:13:01
[DHCP IP: (192.168.0.5)] to MAC address 00:0F:1F:66:81:2D, Wednesday, May 13,2009 04:12:44
[Admin login] from source 192.168.0.5, Wednesday, May 13,2009 04:12:11
[DHCP IP: (192.168.0.5)] to MAC address 00:0F:1F:66:81:2D, Wednesday, May 13,2009 04:06:39
[DHCP IP: (192.168.0.5)] to MAC address 00:0F:1F:66:81:2D, Wednesday, May 13,2009 04:06:22
[Admin login] from source 192.168.0.5, Wednesday, May 13,2009 04:05:52
[DHCP IP: (192.168.0.5)] to MAC address 00:0F:1F:66:81:2D, Wednesday, May 13,2009 03:49:09
[DHCP IP: (192.168.0.5)] to MAC address 00:0F:1F:66:81:2D, Wednesday, May 13,2009 03:48:52
[Admin login] from source 192.168.0.5, Wednesday, May 13,2009 03:47:42
[DOS Attack] : 2 [ACK Scan] packets detected in last 20 seconds, source ip [96.17.159.40]
Wednesday, May 13,2009 03:33:24
[DOS Attack] : 4 [ACK Scan] packets detected in last 20 seconds, source ip [96.17.159.40]
Wednesday, May 13,2009 03:32:44
[DOS Attack] : 1 [ACK Scan] packets detected in last 20 seconds, source ip [96.17.159.40]
Wednesday, May 13,2009 03:32:11
[DOS Attack] : 2 [ACK Scan] packets detected in last 20 seconds, source ip [209.18.46.**]
Wednesday, May 13,2009 03:30:56
[UPnP set event: Public_UPNP_C3] from source 192.168.0.5, Wednesday, May 13,2009 03:28:10
[DOS Attack] : 1 [ACK Scan] packets detected in last 20 seconds, source ip [209.18.46.**]
Wednesday, May 13,2009 03:24:07
[DHCP IP: (192.168.0.4)] to MAC address 00:17:C4:7B:FE:40, Wednesday, May 13,2009 03:16:40
[DHCP IP: (192.168.0.4)] to MAC address 00:17:C4:7B:FE:40, Wednesday, May 13,2009 03:10:36
[DHCP IP: (192.168.0.4)] to MAC address 00:17:C4:7B:FE:40, Wednesday, May 13,2009 03:08:36
[DOS Attack] : 136 [STORM] packets detected in last 20 seconds, source ip [217.160.255.49]
Wednesday, May 13,2009 02:58:29
[DOS Attack] : 133 [STORM] packets detected in last 20 seconds, source ip [217.160.255.49]
Wednesday, May 13,2009 02:58:08
[DOS Attack] : 1 [STORM] packets detected in last 20 seconds, source ip [217.160.255.49]
Wednesday, May 13,2009 02:57:48
[DHCP IP: (192.168.0.5)] to MAC address 00:0F:1F:66:81:2D, Wednesday, May 13,2009 02:55:34
[DHCP IP: (192.168.0.5)] to MAC address 00:0F:1F:66:81:2D, Wednesday, May 13,2009 02:55:18
[Admin login] from source 192.168.0.5, Wednesday, May 13,2009 02:54:07
[DHCP IP: (192.168.0.5)] to MAC address 00:0F:1F:66:81:2D, Wednesday, May 13,2009 02:49:59
[DHCP IP: (192.168.0.5)] to MAC address 00:0F:1F:66:81:2D, Wednesday, May 13,2009 02:49:42
[DOS Attack] : 137 [STORM] packets detected in last 20 seconds, source ip [64.81.79.41]
Wednesday, May 13,2009 02:48:50
[DOS Attack] : 133 [STORM] packets detected in last 20 seconds, source ip [64.81.79.41]
Wednesday, May 13,2009 02:48:29
[Admin login] from source 192.168.0.5, Wednesday, May 13,2009 02:48:21
[DOS Attack] : 1 [STORM] packets detected in last 20 seconds, source ip [64.81.79.41]
Wednesday, May 13,2009 02:48:08
[DHCP IP: (192.168.0.5)] to MAC address 00:0F:1F:66:81:2D, Wednesday, May 13,2009 02:39:29
[DHCP IP: (192.168.0.5)] to MAC address 00:0F:1F:66:81:2D, Wednesday, May 13,2009 02:39:13
[Admin login] from source 192.168.0.5, Wednesday, May 13,2009 02:37:59
[DHCP IP: (192.168.0.3)] to MAC address 00:15:00:1F:7A:03, Wednesday, May 13,2009 02:30:25
[Admin login] from source 192.168.0.5, Wednesday, May 13,2009 02:19:27
[Admin login] from source 192.168.0.5, Wednesday, May 13,2009 01:41:52
[Admin login failure] from source 192.168.0.5, Wednesday, May 13,2009 01:41:49
[Admin login] from source 192.168.0.5, Wednesday, May 13,2009 01:35:45
[UPnP set event: Public_UPNP_C3] from source 192.168.0.4, Wednesday, May 13,2009 01:34:49
[DHCP IP: (192.168.0.5)] to MAC address 00:0F:1F:66:81:2D, Wednesday, May 13,2009 01:31:34
[DHCP IP: (192.168.0.4)] to MAC address 00:17:C4:7B:FE:40, Wednesday, May 13,2009 01:31:07
[DHCP IP: (192.168.0.3)] to MAC address 00:15:00:1F:7A:03, Wednesday, May 13,2009 01:30:26
[DHCP IP: (192.168.0.2)] to MAC address 00:0F:B5:88:57:BE, Wednesday, May 13,2009 01:29:56
Wednesday, May 13,2009 01:29:54
[Internet connected] IP address: 122.109.130.65, Wednesday, May 13,2009 01:29:53
[Initialized, firmware version: V6.00.24] Wednesday, May 13,2009 01:29:23
[System boot up] Wednesday, May 13,2009 01:29:23


Where ever DHCP is written, it means that at that time I have click on internet tray and click Repair. After repairing it works well for sometime. When internet is disconnected, no router light goes off. Every light remains green. IP address remains there.
Today I observed that I when I don't work with server or browse internet on server (it is directly attached via ethernet cable ith router), connection didn't drop.

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"DOS Attack"

by Breezer85 In reply to DSL connection goes down ...

Scan all your PC's and server for possible viruses. I notice you're getting a Denial-Of-Service attack. There may be a virus changing IP/DNS settings somewhere on your system!

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