I've had to expand 2 rules on my Watchguard's, into 6 rules on Meraki. Although I could put the 3 port TCP range for Avaya into the rule above. I've also noticed that you can't put subnets from the Switch Routing & DHCP, or even the VLANs configured on the MX itself, into the source of the firewall rule, so I've created a Network Object for it so if I need to update the subnet, I'l just have to update the Switch subnet and remember to do the Network Object
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