Usg behind isp router. Jan 9, 2017 ยท If it is double-NAT behind a modem or ISP provided firewall, be sure to change the modem or firewalls internal IP range to something other than what you want your local network to be. . Does anyone one know the step by step to successfully installing a usg pro behind an att router/modem and how to avoid the NAT/DNS conflict that is not allowing my computer shares to post I'm trying to set up my USG behind my ISP provided modem. X range, the only thing connected to it directly is a USG, which also acts as DHCP, but under 192. Unfortunately my isp doesn’t allow me to use my own router. Trust me, it's not happening. I have 2 internal networks, 192. This modem does not have bridge mode and cannot be replaced, so that's a dead end. FTTP has become available in my area so I jumped on the opportunity to upgrade from my current 4Mb/s. The upstream router providing your UDM with an IP address would need to be configured for UPnP or have proper port forwarding configured to forward your L2TP/IPSec VPN port (s). eqqwgt cz8qcp3 ib gv ahajz hgp glg1x h6y njr y60igj

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