I have been having some problems of late with a home network that seems temperamental. I have Bell Sympatico HS coming into the house. That goes via ethernet to my intel iMac downstairs which is broadcasting my wireless network to the rest of the house so I can use my Macbook elsewhere.
Recently it seems that the Macbook and iMac have not been able to maintain the connection. The connection for the iMac is fine and I have consistent connection to the internet via the ethernet cable to the modem. I spent some time today tweaking things and thought that I had it. I may be able to tweak and get the connection on the Macbook but when I close it and then reopen it later it won't connect to the internet via airport. It connects via airport to my iMac network so I can see the other computer but no access to the internet.
I have reset the modem and restarted the iMac. Ditto for the Macbook. Most of these problems have been since the security update from the other day. I don't know if that is connected or not. I did reset the iMac TCP/IP to "Using DHCP with Manual address" with the address from this post:
That seems to have worked for the most part but by this point in time I don't know if I have completely reworked ALL my settings and wouldn't know how to get it back to basics except for "reset defaults".
Any help is appreciated.