There is consensus here that AT&T's gateways limit the number of concurrent WAN sessions even if DMZ+ or IP Passthrough is used. Is this still the case or is it with specific GWs? I have a 5031NV that I have configured DMZ+ for my firewall which allows 8000 sessions. I specifically cranked up a P2P client and monitored my FW's session stats in real time and saw it go above 1200 while the stats on the 5031NV remain at 0/1024. All advanced FW features in the 5031NV are unchecked. Nothing incoming is blocked except NetBIOS.
https://www.dslreports.com/forum/r29898675-U-Verse-Business-NVG585-NAT-limit
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