Switch MS120 does not support configuring a port with network /31?
I am trying to configure an MS120 port with a mask of 254, but I get the message below.
ERROR: Static IP should not equal broacast, gateway must be valid IP address.
Regarding networking basics ... /31 is allowed for over 20 years on P2P links. But I am not sure the MX supports it. At least the ASA can handle it.
The MX can support /31 on the WAN Link. I have set one up and it does work.
Good to know!
You're no configuring a port but the management address of the switch. You can't have L3 interfaces on an MS120.
It would also not make sense to have a management VLAN with a /31.
If you would however have an MS2x or higher you can create VLAN interfaces and those will need to have a /30 or less.
OK, got it, thanks for the feedback.
Actually my internet provider is giving me a /31 network. with that I'm trying to put an MS120 before two MX to get a balance.
I think it's not a /31, It's probably a /30. For Warm spare you need at least a /29 or you need to put it behind a NAT.
Oh yes that is a typical one. If you have a public subnet behind the ISP router you will need to run a /29 if you want a primary/standby firewall. You only need to configure the external vlan on your switches.
The other possibility is just to have the ISP run a private subnet behind their router like the typical 192.168.0.0/24 and you use 192.168.0.2 as virtual IP on your HA pair and have the ISP port forward every incoming flow to that IP.