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Originally Posted By: Colt45ws
My only recommendation would be a 2GB of ram and a different power supply brand.
The 2GB of ram isnt going to run you that much more and will give you breathing room, in case you decide to assign more tasks to this machine. Though I thought this machine only had one slot, but I see it has two, now. So, you could always add more later if you found it needed it.
Id go with a Seasonic like this one.
This machine is capable of a lot more.
I run a old Athlon XP machine as my server/router.
It does:
NAT (routing)
Filtering
Intrusion detection
QoS (quality of service; outbound internet traffic is classed and treated with different limits on speed, and delay)
DHCP (assigns computers IP addresses. Basic router function)
DNS (converts web addresses to IP address. Basic service.)
LAN DDNS (convenience for me. The DHCP daemon talks to the DNS daemon and updates a file so that I can connect to a machine on my network just by knowing its name. No messing about trying to figure out which 192.168.x.xxx address it hopped to.)
RADIUS (Allows me to use my paranoid level WPA2/Enterprise wireless authentication. Wireless clients are given a SSL certificate which is checked by the server before being given access to the wireless access point.)
Caching proxy (caches web requests so repeat requests can be served from cache instead of coming down the pipe. Not really needed, but can also be used to filter traffic.)
HTTP (web server)
IRC (chat server)
Plus probably a half a dozen other services that Ive forgotten about but would go missed if it broke.

What distro are you running on that?
Whilst all of my stuff is Cisco gear, there was a time when I used Smoothwall, IPCop and PFSense extensively. I still manage a lot of those boxes for clients and they have been fantastic.
I bring this up because IPCop for example is setup to do a lot of what you have yours configured to do right out of the box.
PFSense is probably my "favourite" of the bunch. And has the nicest GUI by far.
What you've mentioned is really the hallmark of Linux/BSD solutions. Not only are they secure and efficient, but they are also robust: capable of handling a plethora of services simultaneously on rather basic and inexpensive hardware.
My only recommendation would be a 2GB of ram and a different power supply brand.
The 2GB of ram isnt going to run you that much more and will give you breathing room, in case you decide to assign more tasks to this machine. Though I thought this machine only had one slot, but I see it has two, now. So, you could always add more later if you found it needed it.
Id go with a Seasonic like this one.
This machine is capable of a lot more.
I run a old Athlon XP machine as my server/router.
It does:
NAT (routing)
Filtering
Intrusion detection
QoS (quality of service; outbound internet traffic is classed and treated with different limits on speed, and delay)
DHCP (assigns computers IP addresses. Basic router function)
DNS (converts web addresses to IP address. Basic service.)
LAN DDNS (convenience for me. The DHCP daemon talks to the DNS daemon and updates a file so that I can connect to a machine on my network just by knowing its name. No messing about trying to figure out which 192.168.x.xxx address it hopped to.)
RADIUS (Allows me to use my paranoid level WPA2/Enterprise wireless authentication. Wireless clients are given a SSL certificate which is checked by the server before being given access to the wireless access point.)
Caching proxy (caches web requests so repeat requests can be served from cache instead of coming down the pipe. Not really needed, but can also be used to filter traffic.)
HTTP (web server)
IRC (chat server)
Plus probably a half a dozen other services that Ive forgotten about but would go missed if it broke.

What distro are you running on that?
Whilst all of my stuff is Cisco gear, there was a time when I used Smoothwall, IPCop and PFSense extensively. I still manage a lot of those boxes for clients and they have been fantastic.
I bring this up because IPCop for example is setup to do a lot of what you have yours configured to do right out of the box.
PFSense is probably my "favourite" of the bunch. And has the nicest GUI by far.
What you've mentioned is really the hallmark of Linux/BSD solutions. Not only are they secure and efficient, but they are also robust: capable of handling a plethora of services simultaneously on rather basic and inexpensive hardware.