Static wan ip with /31 mask

[yaroot]

Hi,
I'm setting up pfSense as router/firewall for my company's new office, I've never used pfSense before, and we have two WANs (all with static ips) provided by different ISP. But I'm not able to setup the one with 255.255.255.252 (/31) netmask. There's no "/31" for mask option in "Interfaces=>WAN". ( It's a fiber optic connection, and uses a kind of modem before pfSense to convert fiber to normal cable).

ps: I'm using 2.0 rc1 (because of easy multi wan support from what I've googled)

[chpalmer]

Firewall/Virtual IP's

How man static IP's does the fiber give you?

[yaroot]

The ISP give us two networks:
124.xx.yy.zz /31
180.zz.yy.xx /29

But it only work when I use the /31 masked ip address (tested on my laptop and old RouterOS)

When I use 180.x.y.z I can't even ping the gateway of the network successfully.

[jimp]

A /31 isn't generally considered a valid mask as it doesn't contain any routable addresses.

FYI- 255.255.255.252 is /30, not /31.