TCP/UDP Ports Note: All ports listed need to be configured for inbound and outbound connections. Please see the manufacturer’s documentation. Ensure the modem / router is using the latest software (firmware). MTU size is set to 1492 -MAC address filtering is either turned off or allowing the MAC address of the AT&T MicroCell IPSec Pass-Through is Enabled -Block Fragmented Packets is Disabled -If using multiple routers, the Microcell must be connected to the first router connected to the broadband modem -If the MicroCell is connected to a router that is connected to a modem and both the router and the modem have NAT (Network Address Translation) enabled, disable NAT either in the router or the modem. All router settings below – Very Techie Please be advised that the router manufacture or the ISP provider will not provide support for AT&T MicroCell, but they can assist with configuring the following router settings: -DHCP is on -Data is not restricted from passing through ports 4500 and 500 (AKA Port Blocking).

Had to log into my router and set MTU size to 1492 and then set Block Fragmented Packets to Disabled. My default router settings (MG-7540) were stopping the network connect. He sent me a link to setting up my router that is not in the User manual. Took numerous calls to ATT until reaching a bright young man.

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