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NTP issues when Orbi (RBR50) is in Router mode
I have AT&T Uverse with a AT&T Pace 5268AC gateway. My RBR50 is setup in router mode. It is in the DMZ of the gateway (DMZPlus mode so all traffic is directed to it) and has a public IP address. Es...
An update for anyone who may run into this. After posting here, I remembered that I had a AT&T Arris NVG599 in my parts bin. I took it out, reset it, and configured it in "Passthrough" mode for my RBR50. Guess what - NTP has been working since, and I have kept my RBR50 in router mode.
So, FURRYe38 , you were correct about it being an ISP/gateway issue. The AT&T Pace 5268AC gateway was the problem.
Would be a ISP modem issue. Nothing on the Orbi that you can change to fix this.
Something to ask your ISP about. Also your Modem may need to be updated. I believe the PACE is superseded by the Arris BGW-210 if your ISP supports it.
Something you can review and try:
Orbi NTP works fine for me. Though I'm on cable and have a cable modem.
I don't agree that this is a modem issue. By putting the RBR50 in DMZPlus mode on the gateway, I am essentially bypassing the gateway/modem. The RBR50 has a pulic IP address so it's traffic is going out directly. Besides, if it was a modem issue, why does NTP work when I take the RBR50 out of the picture, leaving only the modem? The issue is AT&T blocking UDP 123, and *maybe* the RBR50 not masquerading traffic on that port to something else (which presumably the AT&T modems do). This would not be a big deal if the changes I make to iptables on the RBR50 would stick.
Maybe however DMZPlus has been known NOT to be actual DMZ or giving full public address abilities thus still causing problems.
NTP works on the MODEM since it's the main host router and you connect there. Having the RBR50 behind the modem in router mode also causes a double NAT issue however the DMZ should help with this, however it maybe still causing problems.
NTP works on the RBR. If it didn't then there would be much more users posting about it. I know I would. :smileywink:
What your seeing is mostly the ISP modems mishandling of passing requested traffic thru the DMZ in the double NAT condition. If the modem supporting full bridge mode, then this problem would be solved however ATT modems don't support that option.