We have to UTM 220s in an active-passive configuration with two Internet connections. The ISP for one of the Internet connections needs to know the MAC address that the cable modem is connected to in order to assign a static IP. Is it advisable to use the same virtual MAC on both UTMS for that connection so that when the slave node of the HA takes over we don't have to call the ISP and register the modem with a new MAC?
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