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Forum Discussion
pprindeville
Feb 01, 2026Aspirant
M6 and IP-passthrough with routable static IP
I have an M6 Pro (MR6550) and a T-Mobile business internet account, and I'm unable to use the M6 in passthrough mode. The M6 (the hotspot) does some pretty inexplicable things. Like ARP my firew...
CrimpOn
Feb 06, 2026Guru - Experienced User
Suppose that the Firewall public IP address is 111.222.333.a and the public IP address assigned to the M6 is 333.222.111.b.
If the M6 is put into passthrough mode, then it will send packets to the Firewall addressed to 333.222.111.b and the Firewall will ignore them because it is expecting packets addressed to 111.222.333.a
Put another way, if the M6 is in the default (router) mode, what public IP address does it display?