Is it possible for an ISP to assign you a /31 mask to use on your wan interface of your router or Firewall?
Typically when a customer needs a single IP from an ISP they assign a /30 and use 1 IP on their interface and 1 gets assigned to the customers device. 1 is used as the network address and 1 is used as a broadcast address. Out of 4 ips 2 are wasted and the customer only receives 1 useable.
Wouldn't a /31 give the customer the same thing but save the ISP 2 ip's? IP on ISP interface 1 IP on customer interface. No network address and no broadcast.
I guess my question is could an ISP hand out /31 instead of /30's to save ip space? Or does a client need the network and broadcast address of /30 subnet.
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