what do you define as a WAN port?
the datasheet shows
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Maximum number of interfaces
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Up to 24 total Ethernet ports (12x1G RJ-45, 4x10G SFP+, and network module with 8x10G SFP+)
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would suggest at least max 23 WAN ports (security level 0-99) and 1 LAN port (security level-100)
then it also supports 1024 VLAN's so if you create subinterfaces on a WAN port, you have even more.....
if you mean serial ports or E1/T1, those are not mentioned in the datasheet!
