Proper Firewall Behind Router and with Router

What is the best way to set-up my system? I have 5 home mac's behind a D-Link router, connected to Verizon DSL. I had the router set to give open access to one of my Mac's, and that Mac got hacked via SSH connection attempts. I turned on the Mac's firewall, but I do not know if this is necessary, as I have read you don''t need a firewall behind a router. I suppose there is a better way to set the router. I do want to permit me to SSH and Apple Remote Desktop into the Mac however. How do I allow valid users to SSH in, without be exposed to hack attacks?

Use your browser to access the router and setup the router firewall.
If it has a stealth setting, use that. Each router is a bit different.
The Leopard firewall can be set to "Set access for specific services...." and then each app will ask for permission, once, to use the firewall.
While it may be true that you don't need a firewall behind a router, that really depends on how good the router firewall is. If the router has no firewall, then that statement is completely false. All a naked router provides is Network Address Translation, which is not enough for security these days.
I would suggest you point your browser at this website:
https://www.grc.com/x/ne.dll?bh0bkyd2
and run a port scan.
My Verizon DSL router has all the ports stealthed, meaning that they do not respond in any way to a ping or traceroute. To most hackers, they simply do not exist.
I also use the Leopard firewall.
Do not use any sharing service unless you actually need it, and if you don't need it, turn it off, especially any of the Remote services, Internet sharing, etc.
You can also install LittleSnitch to monitor you systems port activity and see if anyone is accessing your machine.
Finally, it's never a good thing to use an administrator account when a regular account will serve the purpose.

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    Hello Mohammed,
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