Hi.  I've already tried the manual route; as stated, all other choices beside 
DHCP are dimmed, and I don't know why. As for the router, the documentation is 
not accessible, so I have no clue how to go about updating the firmware. All 
other devices in the house are connecting just fine, and the WiFi is showing on 
my status menu as present and on,  but there is a "self-assigned IP address" 
and it says it cannot connect to the Internet. I cannot figure out how to 
change this IP address. I cannot erase it. I am at a complete loss.
Christine

On Sep 29, 2014, at 7:52 AM, Sabahattin Gucukoglu <[email protected]> wrote:

> It sounds like there is some bad interaction between your Mac's DHCP client 
> and your router's DHCP server since your upgrade.  If your ISP already knows 
> about it, presumably they already know about it.
> 
> Do you have control over the router?  If it has firmware, you should try to 
> locate the latest version, and upgrade it.  If the router is crippled by 
> design because your ISP has control over it, my recommendation would be to 
> buy your own router.
> 
> You could try setting your IP address manually.  In System Preferences, 
> Network, you select your interface, then choose to configure IP manually; if 
> it's not on the main screen, press Advanced and it's there on the TCP/IP tab. 
>  You've got to use an IP address and subnet mask compatible with your other 
> devices; pick an IP not likely to be used, like near the end of your range.  
> You could use Google DNS (8.8.8.8, 8.8.4.4) until you learn the addresses of 
> other servers of your ISP, if desired.
> 
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