All of a sudden my Synology DS720 produces Dynamic DNS problems (xxx.synology.me). After quite a bit research the problem is most likey caused by the Orbi (see https://www.synoforum.com/threads/ddns-failed.6762/)My Synology cannot get (mostly 5 or 6 times in a night) an external IP adres. Porwersaving is off in my Synology. Turned of Daylight savings en Network monitoring on Orbi as suggested in other discussions. Anyone a clue?

This is definitely an Orbi issue with firmware 2.7.3.22 I've confirmed it with Netgear Support after a lot of testing. Alas there seems to be no way of fixing excepting hoping they bring out a fixed version of the firmware. This renders my Orbi system completely useless.In the interim I've had to go back ot using the ISP's router/modem so lost all my mesh capabilitie.The only fix woudl be to downgrade the firmware and stop it from auto-upgrading which seems no longer possible.

dbrewood wrote: The only fix woudl be to downgrade the firmware and stop it from auto-upgrading which seems no longer possible. There are two documented methods for preventing firmware auto-upgrade: Disconnect the router from the internet (temporarily).Manually load previous firmware.Enable telnet.Replace the file firmware_version with text where the first number is greater than any likely firmware release(such as V5.2.7.104)This will prevent auto-upgrade until the next time the router is rebooted.With my Orbi on a UPS, it can go 5-6 months without rebooting. (A 4 hour power outage caused one.) Use an upstream router to block the URL's used for firmware upgrading.This, of course, makes applications such as OpenVPN and port forwarding more difficut.(Not impossible, just more difficult.) Since Netgear Support has acknowledged the issue, one might thing they would be willing to provide beta firmware in advance of general release. Sometimes beta firmware is read for test months before general release. (The QA proess for release appears to take some time.)

dbrewood wrote: If I could identify what version of the firmware did have the telnet option I'd try it. The ISP modem/router (British Telecom Home Hub 6) can't be dumbed down and DHCP turned off so that can't be used with the Orbi in AP mode. If it was used in normal mode we'd end up with a double NAT situation I think. Any version prior to V2.7.3.22 has telnet on the debug page. There may be a 'double negative' in the sentence above. For the Orbi to be in AP mode, then some other device (the BT router) must provide DHCP. Note: we seem to have merged two issues into one post. (One from Netherlands. One from British Telecom.) There are actually four method to handle Double NAT. Eliminate Double NAT by putting the ISP device into bridge (passthrough) mode, leaving the Orbi as the only router.This allows the Orbi to handle all 'router functions', such as DHCP, Port Forwarding, choosing DNS sources, assigning IP's, etc. etc. Eliminate Double NAT by puting the Orbi into Access Point (AP) mode, leaving the ISP device to handle all DHCP, assigning IP's, port forwarding, Parental Controls, DNS, etc. etc. This has the benefit of allowing devices to be hard wired to the ISP router and preserves television capabilities. Bypass Double NAT by putting the Orbi in the ISP device DMZ. If all user devices are connected to the Orbi, then the ISP router has only one device connected to it. Live with Double NAT. If port xyz has to be forwarded to some device, Forward that port on the ISP router to the Orbi's IP, then forward that port on the Orbi to the device. This works, but is so much effort that most users would pick 1,2, or 3 instead.

What Firmware version is currently loaded?What is the Mfr and model# of the Internet Service Providers modem/ONT the NG router is connected too? Looking at the responces by others there, seems to be a ISP or DDNS service issue rather than a Orbi issue. I don 't see any comments about Orbi in that thread...

Mention of the Orbi starts about page 3 of the thread. I get the impression that this might be another consequence of the V2.7.3.22 firmware. This thread provided an interesting perspective on DDNS. (which I enjoyed.) It had never occured to me that there could be any number of DDNS entries that resolve to the same public IP address. As long as the connection request refers to a port that has been forwarded to a specific IP on the LAN, any number of devices could be using DDNS. They just all have to have different ports on the Orbi WAN side. I also noticed a comment that the Orbi debug page (at one time) had an option to prevent automatic firmware updates. I do not recall seeing any such option, at least in the past couple of years. A mystery.

Dynamic DNS problems on Synnology with Orbi RBR50V2 firmware 2.7.3.22

61 Replies

FURRYe38
Guru
Sep 13, 2021
What Firmware version is currently loaded?
What is the Mfr and model# of the Internet Service Providers modem/ONT the NG router is connected too?

Looking at the responces by others there, seems to be a ISP or DDNS service issue rather than a Orbi issue. I don 't see any comments about Orbi in that thread...
- CrimpOn
  Guru
  Sep 13, 2021
  Mention of the Orbi starts about page 3 of the thread. I get the impression that this might be another consequence of the V2.7.3.22 firmware. This thread provided an interesting perspective on DDNS. (which I enjoyed.) It had never occured to me that there could be any number of DDNS entries that resolve to the same public IP address. As long as the connection request refers to a port that has been forwarded to a specific IP on the LAN, any number of devices could be using DDNS. They just all have to have different ports on the Orbi WAN side.
  
  I also noticed a comment that the Orbi debug page (at one time) had an option to prevent automatic firmware updates. I do not recall seeing any such option, at least in the past couple of years. A mystery.
  - FURRYe38
    Guru
    Sep 13, 2021
    Seems like there maybe a problem else where well before page 3 though.
    
    I'll look to see if that option is there on my RBR50 with v22 loaded. I don't recall seeing that option either.
- NESSHINDO
  Aspirant
  Sep 13, 2021
  I have firmware 2.7.3.22. in my Orbi.
  My ISP modem is Sagemcom F5359 (Experiabox V12 from ISP KPN in the Netherlands). It has a glass modem as well.
  First i thought my NAS was causing the problem but the gut on the forum did so much research that he convinced me that the Orbi is causing the problem... My Orbi is in Routing mode. DNS on 8.8.8.8.
  - FURRYe38
    Guru
    Sep 13, 2021
    What mode is your modem working in? Bridge or Router mode?
    
    Does changing from google DNS to ISP DNS do anything different? Changing DNS really shouldn't effect anything unless Synology requires something specific with there services. Something to ask them about.

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Dynamic DNS problems on Synnology with Orbi RBR50V2 firmware 2.7.3.22