First four pictures are too small to see them clearly...cannot see hardware version and firmware version. The screenshot of system log should be helpful to figure out the problem. Attach it here, a...

Upgrade the latest firmware released by TP-LINK. http://www.tp-link.com/en/support/download/?model=TL-WDR4300&version=V1#tbl_j

What you are expected cannot be fulfilled. If you want to change router's IP in the same subnet as the modem, you need to configure it as an access point with DHCP disabled. But in this case, all...

Follow these instructions to check your settings. Did you try other computers except the macbook? http://www.tp-link.com/en/article/?faqid=778

C7 has no such parameters. Are you talking about D7? Did you contact your ISP to check your line quality? According to these articles, the SNR Margin seems to be abnormal....

Check the compatibility list and yours is not in the list.. http://www.tp-link.com/common/compatible/print-server/