Connect to Cable Provider switch masq all other port

Router Os 4.13
RouterBoard 493

New office cable modem with public static address

Ether1 the Cable Company tells me
ip 257.139.166.149
mask 255.255.255.224
gw 257.139.166.129

How do I enter this into the tik using CIDR? I did it on my mac static and it works

from there i need to…

connect 192.168.16.2 to ether2

and a host of other pieces of equipment using the rest of the ports like a switch and possibly adding a switch to expand to more ports

also going to need the routes and the nat (masq) to be able to plug statically ip equipment.

and a dhcp server to those that will be dynamic

can someone help me with the CIDR part. Im banging my head why I cant ping out ether1 to at least the gw.

Enter the IP as 257.139.166.149/19 .

The gateway is entered in IP route - destination 0.0.0.0/0 .

Have a look at:

http://wiki.mikrotik.com/wiki/Securing_New_RouterOs_Router

thank you thank you thank you