Address reservation BUG on X20?
This thread has been locked for further replies. You can start a new thread to share your ideas or ask questions.
Hello,
I found strange behavior with address reservation on TP Link Deco X20.
When I add a client f.e. 192.168.2.x to address reservation and later return to address reservation, the address is changed to 192.168.0.x
This issue only occurs when using one of the following internal networks:
192.168.1.x
192.168.2.x
192.168.3.x
192.168.4.x
A factory reset did not resolve the issue.
I have reported this issue before via email and shared log files, but did not receive a response with solution. Initially being informed that this was caused because my internet router was not running in bridge mode. Now it runs in bridge mode, but same issue occurs.
My setup:
WAN: Bridge Mode
LAN IP: 192.168.2.254/24
DHCP Server:
Start IP: 192.168.2.50
End IP: 192.168.2.250
Below screen shows when I add a client:
When I leave menu and go back, the address changed.
Hopefully there is a solution for this issue.
Thanks!
- Copy Link
- Subscribe
- Bookmark
- Report Inappropriate Content
Thanks for the feedback.
We have updated a beta firmware here that would help with the current issue:
https://community.tp-link.com/en/home/forum/topic/567404
Please install this firmware first and it is highly appreciated if you could let me know whether it worked or not.
@Peterdu By the way, based on our test, the problematic LAN IP range is from 192.168.0.1-192.168.3.254.
But based on your description, it was in another range 192.168.1.1-192.168.4.254.
So I wonder if your LAN IP is 192.168.0.1/255.255.255.0, will you also have the current issue?
Thank you very much.
Best regards.
- Copy Link
- Report Inappropriate Content
Peterdu wrote
My setup:
WAN: Bridge Mode
LAN IP: 192.168.2.254/24
DHCP Server:
Start IP: 192.168.2.50
End IP: 192.168.2.250
What is your Main Deco WAN IP and WAN DNS servers IPs? See https://www.tp-link.com/us/support/faq/1855/ if you need help in finding where these IP addresses are.
Also, while we are on it, have you specified LAN DNS IP addresses or left them empty, which is by default.
- Copy Link
- Report Inappropriate Content
WAN: 217.63.5.7
DNS 1: 84.116.46.21
DNS 2: 84.116.46.20
I haven't specified a LAN dns server.
Thx
- Copy Link
- Report Inappropriate Content
There is known case when WAN IP or WAN DNS IP is from the same IP segment as LAN. I thought it might be the case here, but it is not.
If you try different LAN IP range, for example 172.16.0.*, does problem also exits?
- Copy Link
- Report Inappropriate Content
It only occurs with the following ranges:
192.168.1.x/24 until 192.168.4.x/24.
I have tested other ranges and works fine.
Unfortunately changing internal LAN is not an option for me.
I don't understand how it's even possible that TPLINK shows an IP that's outside range of configured network.
Manually adding reservation 192.168.0.x is not possible as expected.
- Copy Link
- Report Inappropriate Content
I'm even able to replicate these issues with a clean standalone install without any wires connected.
- Factory Reset
- No WAN connected
- No LAN connected
- Only my mobile connected to WIFI
See here result, same issue: https://youtube.com/shorts/9RXxm2n0_B8?feature=share
I don't have any other explanation that this is a BUG in TP-Link software. If someone has any other explanation, let me know.
So the issue persist that after saving 192.168.2x address it is suddenly changed to 192.168.0.x.
Another thing I tried is creating a larger network that includes 192.168.0.x - 192.168.2.0 by changing the subnet mask to 255.255.252.0. And in DHCP only configure range 192.168.2.50 - 192.168.2.250.
Although clients ignore the reservation, it is interesting to see that IP addresses don't change in a wrong IP anymore.
Starting from 192.168.5.x there are no issues.
- Copy Link
- Report Inappropriate Content
Hi,
I don't understand your network,
LAN IP: 192.168.2.254/24
what is this network ? I can understand 192.168.2.0/24 but not this one.
- Copy Link
- Report Inappropriate Content
- Copy Link
- Report Inappropriate Content
Thanks for the feedback.
We have updated a beta firmware here that would help with the current issue:
https://community.tp-link.com/en/home/forum/topic/567404
Please install this firmware first and it is highly appreciated if you could let me know whether it worked or not.
@Peterdu By the way, based on our test, the problematic LAN IP range is from 192.168.0.1-192.168.3.254.
But based on your description, it was in another range 192.168.1.1-192.168.4.254.
So I wonder if your LAN IP is 192.168.0.1/255.255.255.0, will you also have the current issue?
Thank you very much.
Best regards.
- Copy Link
- Report Inappropriate Content
Hello,
Thanks for your help.
The new firmware resolved the issue.
I could be wrong about the range as I was testing this some time ago when I submitted a support ticket back in February.
Thanks again.
- Copy Link
- Report Inappropriate Content
Information
Helpful: 2
Views: 1176
Replies: 9
Voters 1