netgear C3700-100NAS sporatic web browsing issues (able to ping / not able to browse).

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PainInMyNet wrote:

I'm having the EXACT same problem, also using Comcast and same Netgear model. I just started looking at my log yesterday because of other suspicious behaviour I've noticed on personal accounts like banking, gaming, etc.

 

Releasing, power cycling, renewing, and changing to Google DNS servers did not change my IP address. Here is my most recent log

 

 

[DoS attack: SYN Flood] from 152.163.13.6, port 80	1	Sun Jan 24 13:13:02 2016	192.168.0.23:51854	152.163.13.6:80
[DoS attack: SYN Flood] from 69.172.216.111, port 80	1	Sun Jan 24 13:12:19 2016	192.168.0.23:51684	69.172.216.111:80
[DoS attack: SYN Flood] from 74.119.118.94, port 80	1	Sun Jan 24 13:12:13 2016	192.168.0.23:51669	74.119.118.94:80
[DoS attack: SYN Flood] from 69.194.244.11, port 80	1	Sun Jan 24 13:12:09 2016	192.168.0.23:51640	69.194.244.11:80
[DoS attack: SYN Flood] from 173.241.250.221, port 80	1	Sun Jan 24 13:11:52 2016	192.168.0.23:51505	173.241.250.221:80
[DoS attack: SYN Flood] from 184.25.254.64, port 80	1	Sun Jan 24 13:11:05 2016	192.168.0.23:51381	184.25.254.64:80
[DoS attack: SYN Flood] from 69.194.244.11, port 443	1	Sun Jan 24 13:10:55 2016	192.168.0.23:51351	69.194.244.11:443

[DoS attack: TCP- or UDP-based Port Scan] from 75.75.75.75, port 53

1

Sun Jan 24 12:55:47 2016

73.71.107.103:55949

75.75.75.75:53

 

Ping has also been disabled since installation, which was about 8 months ago. I'm beginning to think there's a vulnerability in the router Netgear is unaware of or unable to address. Any other suggestions would be great.

 

Thanks

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PainInMyNet,

First, I like th name! ;)

Second, did you notice if comcast upgraded your firmware around 1/1/2016 at 00:30:00?

Also, if you disable the "DOS" feature on your Netgear Modem, do your symptoms disappear (the symptoms being your internet explorer/firefox/browser web pages don't load....)?