What is the address space of your router?  The antminer probably needs to be within the range supported by your router, otherwise it may not be routed to due to the firewall/NAT.  Check what is the address of your router (192.168.1.1 is common, and that would work with 192.168.1.99 for the Antminer).  Check what is the range of addresses that it supports.
Also the IP of the Antminer should not clash with any existing device on your network  (that's why the starting choice of .99 is a clever one...).  The easy way to resolve this is to 'pre-alocate' an IP address in your router.
If for security you are using a MAC filter in the router, of course you need to add the Antminer mac address to the 'permitted list' if that's how you configured it.
Some lazy people try to use DHCP, without considering the pitfalls. I recommend to stay with fixed IP, so you don't run into issues of DHCP lease expiry.

Cheers