DHCP Renew Issue with Road Runner

I have had Road Runner for 6 weeks, the first four weeks everything was running smoothly. However, for the last two weeks the connection has been sporadic and I am constantly losing my connection.
My computer is connected directly to the modem with an ethernet cable; there is no router, there are no other computers. I'm simply trying to stay online with my little computer.
My network settings are for built-in ethernet, using DHCP, with the addresses provided by my ISP (Road Runner) and I've added two DNS server addresses for Road Runner (because several other discussions, posts, etc. recommended using those to help stay connected). I've tried turning my IPv6 off, I've tried manually configuring my DHCP connection, I've scoured the internet for help. All to no avail. Most topics deal with networking with PC's or airports and I have neither attached to this computer. I've created new locations to try and "erase" any default settings and I've kicked the modem a few times (accidentally I assure you ).
From what I can tell, (keep in mind I sell trees and know nothing about this) the DHCP lease does not renew when it's supposed to. I am disconnected every half hour or so, or I have to press "renew" to be able to stay online (highly annoying).
When I first subscribed to Road Runner the connection was fine and I was able to stay online indefinitely. Two weeks ago that changed, even though I did nothing (intentionally) to change network settings. This means I downloaded nothing that would affect my network configuration, I didn't poke around in network configurations, I did not change any settings. I've spoken with their online "tech" support four times. I've spoken to three people on the phone and I've had a tech come out to replace my modem and ethernet cable. When the problem persisted I contacted them again and was told the problem was with Apple <gasp>.
I believe I need help in finding a way to have my mac recognize changes in DHCP and to renew the lease automatically, for all I know it could be that the moon isn't aligned with Saturn <shrug>...preferably in vernacular I can understand. Thank you in advance for any help!
Lori

Hi Lori,
You're not really in the right forum for your problem (this area is for Apple-server) but I'll give it a go...
First, short explanation on DHCP. This process is pretty straightforward for the client's function so I'm suspicious of the "blame the mac" conclusion from Road Runner (although does not exclude possibility). When the mac starts up, it issues a 'Discovery' broadcast, looking for a DHCP server. The server responds with an 'Offer' of an IP address. The client then responds with a 'Request' to the server for the same IP address and the server then sends an 'Acknowledgement' that it may use this address, along with other information including the 'Lease Time' - how long the client may continue to use that info.
The lease time is important. After 50% of this time has gone, the client will attempt to renew it from the same server by issuing another Request and awaiting another Acknowledgement. Should there be no Acknowledgement, the client will continue to issue Requests up until the expiry of the original lease time at which point it will drop all the info which it received from the server and then issue another Offer broadcast, looking for a new server (which may or may not be available).
So, first thing, lets see what lease time you are getting from Road Runner and see if this corresponds with the 30 minutes you seem to get from a session...
Ensure you have a cable connection to your router, restart computer. In Applications-> Utilities, start up Terminal. Enter the following line, ending with normal 'return' key (new line)...
ipconfig getpacket en0
That's a zero at the end.
Look for the line similar to this, "lease_time (uint32): 0x1bd8", and post back the string of chars you get at the end of your line (corresponding to the "0x1bd8" part). Quit the Terminal utility.
Can you also confirm what computer model you use, and the system version?
-david
Server 10.4.8

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After reviewing your post I see one important piece of information
"the mute button flashes red at various times througout the day"
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Well RR never called back prob because I said I wanted a new modem...
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Message was edited by: U Can Call Me Al

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