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Re: U-verse for BUSINESS? : 2Wire 3600HGV bridge mode? or another AT&T supported VDSL modem?
The 68.94.x.x addresses are AT&T's upstream DNS servers. You would probably get slightly faster DNS response if you put them into the Peplink manually rather than allow the Peplink to use the RG as the resolver.

You can leave the Peplink on DHCP if the Peplink is OK with the (slightly non-standard) way that the RG renews DHCP. If you notice that the connection drops at 10 minute intervals, then change the Peplink WAN2 port back to static, but leave it assigned as the DMZPlus device in the 2Wire.
*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.