SonicWall "Possible" SYN Flood attacks; numerous.... Danger??

[kevnad1966]

I saw this question posted in another closed thread, but there was no response from the original poster.
I am a new SysAdmin and have inherited a SonicWall firewall; I was looking at the live logs and puckered up pretty quickly seeing all the bright yellow "Possible SYN Flood attack" messages, all from inside out LAN.
I looked at the System page and CPU is ~1.5% usage so they are not bogging down the box at this point, but are of some concern.

Have an NSA 3500, the FW is SonicOS Enhanced 5.5.2.1-5o

 

[Dinkytoy]

The the sonicwall is probably being over sensitive. However, it's best to check and as they are from inside you can trace the machines back via IP/MAC Addresses and see if there is anything funny going on.