Slow speeds while in DMZ+ mode

Hi,

Try checking the duplex setting, see if that is the cause of the issue you are experiencing,

Tony–AT&T Community Specialist

Tony,

Thanks I did, tried to put on Auto-Negotiate and chose 1000 Full Duplex, didn't make a difference.  I also ran an iperf test on my pfsense router and all the various clients I have hooked up and am getting between 650-750 Mbps between clients. However speedtest.net and att.com/speedtest both are only showing like 60 Mbps down and 225 or so up.  I am using all CAT 6 Cable, that was the first thing I checked. 

Thanks,

Chris

Have you guys fixed this issue? I'm facing this issue now. I have the gigabit internet as well. I tried different combinations and everytime, the dmzplus mode drops the speed to 50mbps down and ~200mbps up. I've tried all suggested workarounds (ipv6 disabled, wireless turned off, auto-detect to 100Base and back to auto-detect). All this didn't do any good.

I tried doing this with my mac and my nighthawk router like this:

 - Mac-Nighthawk-Pace (with Nighthawk as DMZ) = no good

 - Mac-Pace (with Mac as DMZ) = no good

 - Mac-Nighthawk-Pace (no DMZ) = I get gigabit speeds

 - Mac-Pace (no DMZ) = I get gigabit speeds

Something is off with Pace DMZ+ mode that causes the internet speed to slow down to just ~50mbps.

Same issue here, please tell me there's a fix in the works.

Same EXACT issue here. I just got off the phone with support, no help at all. I did a MAC clone and verified that out of DMZ+ mode, I get full GBit. As soon as I enable DMZ+, I'm locked at 50Mb/s down. 

EDIT: Per this thread comment on Reddit, https://www.reddit.com/r/ATT/comments/9nhajt/5268ac_issue_information/e96ykzd, I contacted support. Unfortunately, they do not have any other devices available other than the 5268 (go figure). They're sending me a new one. Hopefully it doesn't have the same firmware.

I'm seeing the same issue and I'm 99% sure it's due to an update.  I had been running my own router behind the AT&T gateway for several months without any issues. I had to make a change in the AT&T Gateway but the UI page would never fully load to allow me to make my change.  I had to reset the AT&T gateway and it after the reboot, it rebooted a couple more times.  After I added my router back into the DMZ my speeds dropped to 50mbps.  If I leave my router double NAT'd I get 900mbps.

If someone finds a resolution to this issue please let me know.  I cannot deal with AT&T support because it's a waste of time.  If this issue keeps up I will be forced to cancel my uverse.

Model: 5268AC

Ver: 11.1.0.531418-att

Wow, and I just thought it was me. DMZ+ has been working fine for years with my pfSense setup, and just in the last few days it's been capped at 50. Sure enough if I Double NAT it now I'm getting full speed. This is absolutely unacceptable.

Same here. I usually get 850 mbps give or take, as soon as I enable DMZplus I get capped at 50 mbps. It was working for me for at least a year just fine. So I agree it must be due to a pace modem firmware update. It started happening 2-3 weeks ago for me.

Is there any way to revert to a previous pace modem firmware?

Customer service gave me $50 credit adjustment this month and will be calling ATT every month expecting the credit adjustment until this issue is resolved. 

I first found the issue when I couldn't transfer files over SCP from home to my cloud servers (AWS and Linode). My SSH connections get killed if I try transferring any files larger than 5MB! It's such a pain.

Here are some MTR reports which made me aware the issue was on my side.

Me too!!!  Argg I just wasted an hour or so to figure out the dmz plus is what is limiting my bandwidth to 50mbs.  If I remove it then I get like 800.  

I guess I gotta call their technical support when I get some time.  

I confirm I see the same issue here with edgerouter 4 behind 5268AC with firmware 11.1.0.531418-att. DL capped at around 50 Mbps when DMZ+ enabled, and ~ 850 Mbps otherwise (fiber connection).