Ethernet configuration settings (Asante router, new iMac)

I have a cable modem (ISP is Adelphia, which is now part of TimeWarner) connected to an Asante FR3004C Router. I have 4 computers hooked up to the router, including my new 2.4GHz iMac. Ethernet runs are fairly long, through the house.
When I try to configure Ethernet (in Network Preferences) using "Automatic" I don't get a connection, so I set it up manually. I've been doing it somewhat randomly, just seeing what works, but would like to know if there are any rules, or at least guidelines, for which settings to use.
Current settings are: 10baseT/UTP, full-duplex, Custom packet size: 1200. These settings are based on what's worked on my other computers and on previous computers (old iMac, iBook, couple of emacs). I tried going to 100baseT (since this new iMac supports that), but then I need to go to half-duplex.
What I'm wondering is if someone can explain these settings (or point me to a good online explanation), so I can optimize my connection speed intelligently, instead of just trying random settings. Suggestions for settings would also be appreciated.
Also, is the Asante FR3004C an okay router for what I'm doing, or would there be any advantage in updating it???
Thanks for any advice!
DanK

Setting up an OSX network...
http://www.net.princeton.edu/mac/network-config-x/
http://www.more.net/technical/mac/osxdirect.html
http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh1152.html
Additionally...
Different ServersRouters/Switches/Modems may have different MTUs, and that can cause Havoc, here's some guides on that issue...
Setting MTU size is a process of trial-and-error: start with the maximum value of 1500, then reduce the size until the problem goes away. Using one of these values is likely to solve problems caused by MTU size:
• 1500. The largest Ethernet packet size; it is also the default value. This is the typical setting for non-PPPoE, non-VPN connections. The default value for NETGEAR routers, adapters and switches.
• 1492. The size PPPoE prefers.
• 1472. Maximum size to use for pinging. (Bigger packets are fragmented.)
• 1468. The size DHCP prefers.
• 1460. Usable by AOL if you don't have large email attachments, etc.
• 1430. The size VPN and PPTP prefer.
• 1400. Maximum size for AOL DSL.
• 576. Typical value to connect to dial-up ISPs.
Full Duplex means it can send & recv at the same time, Half Duplex just one at a time.

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