Regarding your questions:
> Support traffice filtering by IP host add/range and deep packet inspection at wire speed?
DPI is not possible at Wire Speed. But that's the case for every other firewall out there. Please find throughput figures here: https://meraki.cisco.com/products/appliances/#models
> Manageable via SNMPv3, supports snmp trap messages
Management is done completely cloud-based (via Dashboard), you could also leverage the API for that. SNMPv3 could be used for monitoring puposes though: https://documentation.meraki.com/zGeneral_Administration/Monitoring_and_Reporting/SNMP_Overview_and_...
> Support 802.1q
Yes, but you'll have to activate VLANs first: https://documentation.meraki.com/MX/Networks_and_Routing/Configuring_VLANs_on_the_MX_Security_Applia...
> The firewall shall support syslog protocol for reporting events?
Yes, not only Syslog:
https://documentation.meraki.com/zGeneral_Administration/Monitoring_and_Reporting/Meraki_Device_Repo...
https://documentation.meraki.com/zGeneral_Administration/Monitoring_and_Reporting/Syslog_Server_Over...
> Continue to log events while under attack (DOS, DDOS, etc)
As long as the box is up and running it will produce logs. Perhaps Meraki could elaborate further on that.
> THe FW should support DNS functionality for local host that resolves uo to a public DNS
What exactly do you mean? MX itself won't be able to do that but could leverage Cisco Umbrella to add DNS layer enforcement.
