Solution Solution to DHCP Issues of Routers (ER605 | ER7206 | ER8411 | ER7212PC) [Closed on May 22nd 2023]
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Update as of May 22nd 2023:
The following official firmware has fixed the DHCP issue mentioned in this thread.
ER605 V1_1.3.0 Official Firmware (Released on May 17th, 2023)
Note: the firmware is applied to ER605 V1 and V1.60.
ER605 V2_2.1.2 Official Firmware (Released on Feb 14th, 2023)
Note: the firmware is applied to ER605 V2 and V2.60.
ER7206 V1_1.3.0 Official Firmware (Released on Mar 28th, 2023)
Note: the firmware is applied to ER7206 V1 and V1.60.
ER8411 V1_1.0.3 Official Firmware (Released on Mar 17th, 2023)
Note: the firmware is applied to ER8411 V1 and V1.60.
ER7212PC V1_1.0.3 Official Firmware (Released on Mar 21st, 2023)
As the official firmware has been released to fix the issue, this thread will be locked to stop updating.
Any further issues or concerns, please feel free to Start a New Thread from HERE.
To get better assistance, you may check Tips For Efficiently Reporting an Issue In The Community.
Update as of Mar 8th 2023:
1. Update the Beta firmware of ER7212PC v1, which fixed all DHCP issues and added some new features.
ER7212PC(UN)_V1_1.0.3 Build 20230228 (Beta)
Beta Release Note:
1) Fixed all DHCP issues based on the official firmware 1.0.2 Build 20230202.
2) Add support for modifying port PVID and optimized stability of the device.
3) Cloud Access is available for the above ER7212PC 1.0.3 Beta.
4) You may need to manually upgrade the upcoming official 1.0.3 firmware once you install the above 1.0.3 Beta.
2. Add note that ER605 v1 and ER7206 v1 have a new Beta firmware for trial, which fixed all DHCP issues and added some new features.
ER7206 V1_1.2.3 Beta Firmware For Trial (Released on Feb 28th, 2023)
ER605 V1_1.2.3 Beta Firmware For Trial (Released on Feb 28th, 2023)
Kind Note:
If you don't need the new features added in the above 1.2.3 Build 20230224 (Beta), it's okay to stay with the earlier Build 20230208 (Beta).
Notes:
(1) Please be sure you have read the Beta Test Agreement before proceeding!
(2) The above Beta has added the fix for the DHCP Reservation issue mentioned HERE.
Update as of Feb 21st 2023:
Add beta firmware for ER8411 v1 and ER7212PC v1 to fix all DHCP issues.
ER8411(UN)_V1_1.0.2 Build 20230214 (Beta)
Beta Release Note:
Fixed all DHCP issues based on the official firmware 1.0.2 Build 20230115.
Notes:
(1) Please be sure you have read the Beta Test Agreement before proceeding!
(2) The above Beta has added the fix for the DHCP Reservation issue mentioned HERE.
Edit on Feb 23rd 2023: add note that Cloud Access is unavailable for the above ER7212PC Beta.
New ER7212PC Beta will be provided soon to add Cloud Access availability. Please wait patiently.
Update as of Feb 14th 2023:
Here are the new solutions to resolve the new DHCP issues we recently received in the community, including
1. DHCP Server failed to assign an IP address when a large number of clients make DHCP requests at the same time.
2. DHCP server failed to assign the correct reserved IP address to some clients.
Beta Firmware Download:
ER605(UN)_v1_1.2.2_Build 20230208 (Beta)
Beta Release Note:
Fixed all DHCP issues based on the official firmware 1.2.1 Build 20220512.
ER7206(UN)_v1_1.2.3_Build 20230208 (Beta)
Beta Release Note:
Fixed all DHCP issues based on the official firmware 1.2.3 Build 20221104.
ER8411(UN)_V1_1.0.2 Build 20230214 (Beta)
Beta Release Note:
Fixed all DHCP issues based on the official firmware 1.0.2 Build 20230115.
Notes:
(1) Please be sure you have read the Beta Test Agreement before proceeding!
(2) The above Beta has added the fix for the DHCP Reservation issue mentioned HERE.
For ER605 V2, please check for the official firmware below to fix the DHCP issue.
ER605 V2_2.1.2 Official Firmware (Released on Feb 14th, 2023)
Note: the firmware is applied to ER605 V2 and V2.60.
As always, thank you for working with our support engineers to address the issue with great cooperation.
And thank you all for your great patience when we're trying to figure out the issue and fix it!
Update as of Jan 30th 2023:
Thank you all for your feedback on this forum to let us know that the DHCP issues are still existed, and more importantly, thanks for our loyal users who worked with our support engineers to figure out the issue with great cooperation.
Here are the updates of the Beta firmware to fix all the DHCP issues that have been located, including
- DHCP Server failed to assign valid IP addresses to some clients. Reported Here.
- Different clients have duplicated IP address on the Omada Controller. Reported Here.
- Offline wireless clients were still shown up in Clients list and reported as connected to the Omada Router. Reported Here.
(Note that ER605 v2 ONLY have the last DHCP issue mentioned above, which is a mis-report by the router.)
Beta Firmware Download:
ER605(UN)_v1_1.2.2_Build 20230118 (Beta)
Beta Release Note:
Fixed the DHCP issues based on the official firmware 1.2.1 Build 20220512.
ER7206(UN)_v1_1.2.3_Build 20230118 (Beta)
Beta Release Note:
Fixed the DHCP issues based on the official firmware 1.2.3 Build 20221104.
Notes:
(1) Please be sure you have read the Beta Test Agreement before proceeding!
(2) The above Beta has added the fix for the DHCP Reservation issue mentioned HERE.
For ER605 V2 and ER8411 V1, please check for the official firmware below to fix the DHCP issue.
ER605 V2_2.1.1 Official Firmware (Released on Jan 30th, 2023)
Note: the firmware is applied to ER605 V2 and V2.60.
ER8411 V1_1.0.2 Official Firmware (Released on Jan 30th, 2023)
Note: the firmware is applied to ER8411 V1 and V1.60
Thank you all for your great patience when we're trying to figure out the issue and fix it!
Any further issues with the above Beta firmware, please feel free to comment below or Start a New Thread from HERE.
Updated on Nov 11th 2022:
The official firmware ER7206_v1_1.2.3 has been released to fix the DHCP issue.
**The above ER7206 1.2.3 firmware is available in the cloud, fully adapted to Omada Controller v5.6.
Updated on Nov 2nd 2022:
Update the Beta firmware to fix all the DHCP issues that have been reported to the support team, including the issue
- DHCP Server failed to assign valid IP addresses to some clients. Reported Here.
- Different clients have duplicated IP address on the Omada Controller. Reported Here.
- Offline wireless clients were still shown up in Clients list and reported as connected to the Omada Router. Reported Here.
ER605(UN)_v1_1.2.2_Build 20221015 (Beta)
ER7206(UN)_v1_1.2.2_Build 20221025 (Beta)
ER605(UN)_v2_2.0.2_Build 20221025 (Beta)
*The above beta firmware is adapted to Omada Controller v5.5, not for Controller v5.6.
Note:
ER605 v2 ONLY have the last DHCP issue mentioned above, which is a mis-report by the router.
Updated on Sep 21st 2022:
Remove the 0918 Beta firmware as some users reported it causes CPU spikes issue.
Updated on Sep 19th 2022:
Update the Beta firmware and add the latest Beta firmware for ER605 v2/ v2.6, which have added the fix that Omada Router may wrongly report the clients status to the Omada Controller, causing the issue that offline clients were still shown up in the Controller Clients list, and connected to the Omada Router (instead of the SSID or network). For more details, check this related post.
ER605(UN)_v1_1.2.2_Build 20220902 (Beta)
ER7206(UN)_v1_1.2.2_Build 20220902 (Beta)
Newer version >> ER605(UN)_v1_1.2.2_Build 20220918 (Beta)
Newer version >> ER7206(UN)_v1_1.2.2_Build 20220918 (Beta)
Newer version >> ER605(UN)_v2_2.0.2_Build 20220918 (Beta)
This Article Applies to:
ER605_v1/ v1.6
with FW 1.2.0 Build 20220114 or FW 1.2.1 Build 20220512
ER7206_v1/ v1.6
with FW 1.2.0 Build 20220117 or FW 1.2.1 Build 20220512
Issue Description/Phenomenon:
Recently we received feedback that the DHCP Server failed with 1.2.0 and 1.2.1 firmware, the issue may manifest as follows:
- DHCP Server won't provide dynamic IP addresses to end clients in some cases.
Related Post: DHCP Server Fails Every Few Hours
(1) simply clicking Save on the Edit Network page will bring the DHCP server to work for a few hours.
(2) reboot doesn't help, the issue doesn't exist with the router firmware 1.1.1.
- Some clients are assigned the same IP address, causing they cannot access the internet.
Related Post: Issues with DHCP, clients get same iP addresses
(1) rebooting the router will solve the issue for a while.
(2) the issue doesn't exist with the router firmware 1.1.1.
Note:
ER605 v2 doesn't have the two DHCP issue described above.
Thank you all @jdpk, @Karel-24, @PascalSBR for reporting the issue with detailed information, and your great cooperation with our support engineers to look into the issue is much appreciated!
After further investigation and tests, the TP-Link team has addressed the problem finally.
Available Solutions:
Update as of Apr 17th 2023:
The following official firmware has fixed the DHCP issue mentioned in this thread.
ER605 V2_2.1.2 Official Firmware (Released on Feb 14th, 2023)
Note: the firmware is applied to ER605 V2 and V2.60.
ER7206 V1_1.3.0 Official Firmware (Released on Mar 28th, 2023)
Note: the firmware is applied to ER7206 V1 and V1.60.
ER8411 V1_1.0.3 Official Firmware (Released on Mar 17th, 2023)
Note: the firmware is applied to ER8411 V1 and V1.60.
ER7212PC V1_1.0.3 Official Firmware (Released on Mar 21st, 2023)
For ER605 V1, you may install the Beta firmware below to fix the issue temporarily.
Beta Firmware Download:
ER605 V1_1.2.3_Build 20230413 Beta Firmware For Trial (Released on Apr 14th, 2023)
Notes:
(1) Please be sure you have read the Beta Test Agreement before proceeding!
(2) The above Beta has added the fix for the DHCP Reservation issue mentioned HERE.
Update as of May 22nd 2023:
The following official firmware has fixed the DHCP issue mentioned in this thread.
ER605 V1_1.3.0 Official Firmware (Released on May 17th, 2023)
Note: the firmware is applied to ER605 V1 and V1.60.
As the official firmware has been released to fix the issue, this thread will be locked to stop updating.
Any further issues or concerns, please feel free to Start a New Thread from HERE.
To get better assistance, you may check Tips For Efficiently Reporting an Issue In The Community.
Thank you all for your great patience when we're trying to figure out the issue and fix it!
Previous Solution Post:
ER605 ER7206 - “Use Fixed IP Address” (DHCP Reservation) Doesn't Take Effect
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Dear @havenstance,
havenstance wrote
@Fae I've got an ER-7206 and I can confirm this bug with Firmware 1.2.3, I had it as well. Rolling back to 1.2.1 has seemed to fix my issues. The DHCP Server would quit working after a few hours, causing my APs to not connect. A reboot of the switches would not fix the issue, neither would rebooting the APs, changing the wifi password did seem to help for a while, as did completely resetting and reconfiguring the network, but it would only last a while and quit working. After the roll back, all issues disappeared, and the router is working as expected again, as are the wireless access points.
Thank you for your kind feedback. The support engineers are trying their best to figure out the issue now. Hope the issue be addressed soon.
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I Have er605 version 1.6 with the loaded test firmware version
Having issues with the sntp server everytime the hardware is restarted it completely resets the time and date.
which throws off all the other devices i have on the network that rely on this to sync to
half the time i can not get it to sync to the time servers if it is in auto get time
set it to manual mode and it completely resets the time everytime the system reboots and does not remember what it was set too
My Er605 is running with
arp spoofing: enabled
DHCP server: off
DNS Server: on
DHCP is managed via a firewalla blue plus
ip is static defined for the firewalla device
from the log which is pictured below in the screenshot attached i get a arp collision as well due to server time issues it looks like
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Dear @Fae
yes, I have the issue with ER7206 and firmware 1.2.3. It looks like I have the issue whenever I have any scheduled jobs ran. For the first time it happened exactly after the Scheduled AI Optimizer. After I found that's the issue, I disabled it, I went into the management interface and enter the DHCP settings page (Controller Settings (cog on the lower left) | Wired Networks | LAN | Edit (under Actions)) and then simply clicked Save on the Edit Network and it was operational again. And again tonight I had exactly the same issue, but this time it happened after my monthly scheduled restart on APs happened. I forgot about that and I woke up to a network with only half of the devices are connected.
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After working fine since the update to v1.2.3 my router is experiencing the same DHCP issues again. Today I randomly had two clients that didn't get an IP address. Rebooting seems to help but it's obviously not solved properly with the v1.2.3 update
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@tansuk
I can confirm your theory, it has something to do with the scheduling itself, I updated my ER7206 again to version 1.2.3, disabling scheduled wifi optimization fixed the DHCP problem, I had no more IP losses.
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i have confirmed it seem to be something with the time server and leasing
the device is not keeping the time properly
anytime the device does a sntp time sync it seems to drop the current time and reset the time
when the device does the time drop it resets the time to 1970 jan 1 0500:13 then updates it from the sntp
meaning it is releasing the current time in the database via removing it and reinserting the time in the table which causes the scheduling of DHCP leasing and cron jobs and everything else in the system to reset based on the last reset of time sync
if you put the device in manual mode time sync it to your desktop time....
then reboot the device the time is not remembered it resets the time to 1970 jan 1 0500:13
from that point on everytime you reboot the device you have to log into the device and set the time manually however this does not solve the issue either
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tansuk wrote
Dear @Fae
yes, I have the issue with ER7206 and firmware 1.2.3. It looks like I have the issue whenever I have any scheduled jobs ran. For the first time it happened exactly after the Scheduled AI Optimizer. After I found that's the issue, I disabled it, I went into the management interface and enter the DHCP settings page (Controller Settings (cog on the lower left) | Wired Networks | LAN | Edit (under Actions)) and then simply clicked Save on the Edit Network and it was operational again. And again tonight I had exactly the same issue, but this time it happened after my monthly scheduled restart on APs happened. I forgot about that and I woke up to a network with only half of the devices are connected.
@tansuk this has been my experience as well, in that the DHCP issues appear to be related to the router time/scheduled jobs.
@Fae I copied these recent replies into the support ticket you opened for me (TKID221130671).
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Any chance that you could point me to a copy of the 605 V1 1.1.1 beta? The release version has the stealth bug,
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