MX95 and router IP's

[MrAliC1976]

Hi all, 

Scenario 

ISP has provided a WAN public /30 and a LAN Public IP  /29 which routes to the /30 

I have two MX95's which I need to configure in some form of HA. 

I can obviously configure the /30 as an uplink IP on one of the MX's however, I'm confused as to it it's possible to use the /29 instead?

[rwiesmann]

I guess the /30 is the WAN IP of the Device the ISP provided to you. 

This means the range you can use is the /29

If it is this way, you can not use the /30 and you have to uses the addresses out of the /29 for the MX

[alemabrahao]

Both MXes need to be on the same subnet, that is, you need at least a /29 for the public network.

The option you have in this case is to configure a private IP on the WAN of the MXes, but for that you need to have a NAT for the exit to the internet for this private subnet.

I don't know if you understand?

https://community.meraki.com/t5/Security-SD-WAN/Configuring-virtual-ip-addresses-on-MX-HA-warm-spare...

[jphamwd]

We HA our MX85s and are not hosting anything behind them

-/29 WAN public, no LAN publics needed

-Single handoff from ISP that is plugged into our LAN switch as a breakout for the MXs

-Use 3 IPs, 1 VIP, and each MX

[DarrenOC]

As already mentioned you need 3 Public IPs, 1 for each MX and one for the VIP.

[Inderdeep]

correctly said by @DarrenOC .. Generally needed 3 Public IPs for an HA setup 

1- Device 

2- Spare

3-VIP