DoS attacks

HAVOC

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I just bought a Motorola SB6121 modem and a Netgear WNDR4300 router. In checking the logs I have a bunch of DoS attacks. Should I be concerned?
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
custom build
OS
Windows 7 Professional 64bit
CPU
Intel i7-5960X
Motherboard
EVGA X99 Classified
Memory
64GB Corsair Dominator 2400MHz
Graphics Card(s)
3 EVGA GTX980's
Sound Card
on board
Monitor(s) Displays
3 Dell E2715H 27"
Screen Resolution
1920x1080 (5760x1080)
Hard Drives
Samsung 950 Pro 1TB M.2 SSD,
Western Digital Black 2TB HDD's x5
Western Digital Black 1TB HDD's x3
PSU
Corsair AX1200i
Case
Corsair 750D
Cooling
Corsair H110i GT
Keyboard
Corsair K70
Mouse
Corsair M45
Internet Speed
250 down/10 up
Antivirus
Microsoft Security Essentials
Browser
IE 11, Google Chrome
What is in the logs that leads you to believe this?
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
HP
OS
Windows 7 Pro 64 bit
CPU
Xeon W3520
Memory
8 GB
Graphics Card(s)
Nvidia Geforce 210
These are just a couple:
[DoS Attack: SYN/ACK Scan] from source: 58.216.26.243, port 17010, Monday, December 01, 2014 00:23:06
[DoS Attack: SYN/ACK Scan] from source: 176.31.101.5, port 6667, Sunday, November 30, 2014 23:52:52
[DoS Attack: SYN/ACK Scan] from source: 176.31.101.5, port 80, Sunday, November 30, 2014 23:29:47
[DoS Attack: SYN/ACK Scan] from source: 176.31.101.5, port 6667, Sunday, November 30, 2014 23:14:17
[DoS Attack: SYN/ACK Scan] from source: 176.31.101.5, port 80, Sunday, November 30, 2014 23:02:29
[DoS Attack: SYN/ACK Scan] from source: 176.31.101.5, port 6667, Sunday, November 30, 2014 23:01:11
[DoS Attack: SYN/ACK Scan] from source: 37.48.86.133, port 80, Sunday, November 30, 2014 22:46:49
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
custom build
OS
Windows 7 Professional 64bit
CPU
Intel i7-5960X
Motherboard
EVGA X99 Classified
Memory
64GB Corsair Dominator 2400MHz
Graphics Card(s)
3 EVGA GTX980's
Sound Card
on board
Monitor(s) Displays
3 Dell E2715H 27"
Screen Resolution
1920x1080 (5760x1080)
Hard Drives
Samsung 950 Pro 1TB M.2 SSD,
Western Digital Black 2TB HDD's x5
Western Digital Black 1TB HDD's x3
PSU
Corsair AX1200i
Case
Corsair 750D
Cooling
Corsair H110i GT
Keyboard
Corsair K70
Mouse
Corsair M45
Internet Speed
250 down/10 up
Antivirus
Microsoft Security Essentials
Browser
IE 11, Google Chrome
Anything directly connected to the Internet, like routers, will be targeted like this all the time. It's normal.

I've stopped checking my router logs cause there's no point in doing that. The best you can do with your router is to disable remote management, UPnP, port forwards, and make sure you're not using the default password that came with the router.

Use ShieldsUp to verify that everything is closed from the outside: https://www.grc.com/x/ne.dll?bh0bkyd2
 

My Computer

Computer type
Laptop
Computer Manufacturer/Model Number
HP Elitebook 8540p
OS
Windows 7 Pro 32
CPU
Intel(R) Core(TM) i5 CPU M 540 @ 2.53GHz
Motherboard
Hewlett-Packard 1521
Memory
4,00 GB (Usable 2,98)
Graphics Card(s)
NVIDIA NVS 5100M
Sound Card
NVIDIA High Definition Audio
Screen Resolution
1600x900
Hard Drives
INTEL SSDSA2CW120G3
Antivirus
F-Secure Internet Security
Browser
IE, Firefox, Opera
Other Info
Sandboxie,
SRP (Software Restriction Policy),
EMET (Enhanced Mitigation Experience Toolkit),
WFC (Windows Firewall Control by BiniSoft),
Malwarebytes Premium
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