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When you replace an existing firewall (MX or otherwise) with an MX, the MX will send out gratuitous ARP on the WAN for the primary IP only. It will not send out gratuitous ARP for IPs configured as 1:1 NATs. This means that the internet will be acces...
Thanks for the wish! I agree that it's uncommon, but when it does happen it's very, very inconvenient. Plus, this shouldn't be a problem in the first place. Every other firewall out there sends out gratuitous ARP for 1:1 NATs.