insecurity in internet connection thro cable modems

[ravi <ravivsn () roc co in>]

Hi All,
I am planning to have cable internet connection for my LAN. As it is 
found to be less secure I want to configure a firewall at the gateway of 
my  LAN. In what way,should i configure the firewall at my gateway?

can linux ipchains helps me?

Thanks in advance,
Ravi Kumar.

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