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Firewall Blocking Inbound/Outbound Best Practices

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Hi Everyone,

I am very new to advance firewalls, bascially anything beyond a Linksys router. I am also very new to Untangle, so please be a little patient if my questions sound a bit newbish.

What are some best practices around block all then opening ports in the firewall for both inbound and outbound. My current setup, that i plan on injecting the Untangle into is:

Comcast->Linksys->SBS 2008 Server(which is running DHCP/DNS for network)->Switch->Computers

Should I place the Untangle between the Linksys and the server or replace the linksys entirely? Beyond ports 25, 443, 987 inbound, what should I open for outbound?

I know ther will be multiple answers, I just need to gather data, as I will be implementing my Untangle solution within the next few days. Any insight the community can provide, that will be great.

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