Thank you, Paul.  I have answered as best as I can below.
Paul wrote:
> 
> Is eth0 your internal nic (default setup) or have you got
> them switched in the configuration so that eth1 is your
> interanl?
Yes, about a year ago, I had to switch the set-up because in the auto-configuration or auto-discovery, the sme always finds the NIC card that I want to use as external first.  So eth0 is the external, eth1 is internal.
> 
> What brand and model is the ADSL?
It is actually a cable modem.  It is an Ericsson Piperider HM200c.
 
> Is your ADSL set as a bridge or a router with nat inabled
> (hardware firewall)?
I am using the sme as the gateway server.  So if I understand correctly, the sme is my router.  I assume that the modem is a bridge then.  Not sure what a "bridge" means in this context.
 
> Do you have a static or dynamic IP address from your ISP?
I have a dynamic IP address from the ISP
 
> Have you switched your nic cards around?
Yes.  The nic hardwired into the server died and I had to add a new PCI nic card.  This new nic card is supposed to be the internal nic but the sme always discovers it first so I have had to switch them while in the configuration menu.  After I get past the initial 1-2 weeks from a clean install and upgrade, I don't have any problems with this.  I also didn't have any problems running this configuration under sme 5.1.x
 
> Are you using the right kind of connection for your ISP
> (DHCP, PPPoE, Static)?  (This may be where your problem is if
> you are behind a firewall.)
Yes, the ISP wants us to use DHCP.
 
> If you are behind a hardware firewall (your ADSL "modem" may
> act as a firewall), then you will need to change you settings
> accordingly.
No, I don't think the modem is acting as a firewall.  Maybe the ISP does do this, I don't know.  I have tried to understand the DOCSIS standard so I might figure out if my ISP is blocking some ports locally or at the head end.  Unfortunately, I am still a sme hobbiest and so the DOCSIS technical guides are beyond my capacity.
To reiterate, the problems that I am experiencing with the sme losing the external connection only seemed to happen after the clean install and for a week after.  Then for what ever reason, it works flawlessly.  I don't change anything after I have made the initial configuration except perhaps to turn on/off ssh access.
 
> Answer these questions and I might have a couple more.
> 
> Best wishes,
> Paul
Thanks again, Paul.  I appreciate any help you or anyone can provide.  I realize that some of these questions or issues might be a no brainer for you guys.  I am learning as I go.  The sme is really excellent.
Nuke