Could you explain to me
Pros and Cons of unmanaged vs. managed, please?
I will need NIC also any suggestions?
Other Question is wrt54 with DD-WRT? supposibly it works and has alot of features?
As far as firewall goes (I know sounds stupid) how much more better is it vs. computer firewall (eset).
Scotty covered lots of the "managed vs unmanaged" points....basically, if all you ever see yourself having is a single basic network...and if you wish to keep your budget down, stick with an unmanaged switch. Some common uses in smaller biz networks for managed switches is to separate the network via VLANs...so that computers in one VLAN cannot see computers in other VLANs. Having open wireless networks is a common use for this, or..say...school networks..so that the common student PCs cannot get to the office computers.
DD-WRT and Tomato add some neat features to routers...such as basic VLAN needs, some better QoS features, increased stability, slightly snappier performance. But for business networks...as the primary router, I don't use them there. I have used the firmware to utilize the routers as pure access points..it does a good job there...much more stable. It doesn't really add much for "better firewall" jobs...NAT is NAT, SPI is SPI. Using 3rd party firmware on a unit as your primary router really doesn't add security versus stock firmware. Same as Scotty mentioned...for a small business network, over the years I've learned to stick with full biz grade hardware as the primary router. "Set it and forget it". Using home grade equipment here ends up with frequent phone calls.."My internet is down". "OK...reboot your router". I get tired of those.
Software firewalls/Internet Security Suites....are different, they protect each PC...and what they do, that a router does not...is filter "outbound" stuff on the computer. Say your computer picks up a trojan...and that trojan goes to "phone home"...and begin a communication channel to the hacker...a NAT router will not stop that, but a software firewall has the ability to..if the end user pays attention. Usually the end user does not though, most end users see the firewall prompt for "svchost is attempting to..."...and frustratingly just clicks "Allow". I don't use software firewalls..for the sole purpose of they end up being too naggy, too many phone calls, not worth the trouble. That's just my opinion and my preference though. I try to keep the PCs patched up, cleaned and use good antivirus/antithreat software on them to keep the trojans off in the first place.
Per your PM...if you want gigabit LAN...yeah the RV016 won't be for you, stick with a smaller router like the RV042..and get a gigabit switch to uplink to. No sense in paying extra for the RV016 if you won't use extra the 10/100 ports on it for your LAN.