ip/ipconfig -g 199.98.16.1 ether /net/ether0 199.98.17.238 255.255.248.0 >…
That should be fine as long as you're running the latest ipconfig or
an old one. For a few days, ipconfig needed an explicit verb, like this:
ip/ipconfig -g 199.98.16.1 ether /net/ether0 add 199.98.17.238
255.255.248.0
