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Firewall Changes - Knock on effects?

Posted on 2011-09-08
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Last Modified: 2012-05-12
Hi All

We have a sonicwall NSA 3500 filewall appliance and we are thinking about enabling the following features.

Enable TCP handshake enforcement
Enable TCP checksum enforcement

Can anybody explain what effect this will have?

(I have a brief idea but i am playing dumb to make sure i havent overlooked anything).

Thanks for any comments.
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Question by:ict-torquilclark
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Kamran Arshad earned 2000 total points
ID: 36501690
Hi,

The TCP Handshake enforcement requires a successful three way handshake for all TCP connections. It prevents DDOS attacks by dropping connections which are incomplete and only allow a connection after three way handshake. The  Enable TCP checksum enforcement  drops a packet If an invalid TCP checksum is calculated. You can also check the below link;

https://www.fuzeqna.com/sonicwallkb/consumer/kbdetail.asp?kbid=3768&p=t
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