USG FLEX 200H DHCP reserved IP edit error (bug)

bbp

USG FLEX 200H, firmware V1.21(ABWV.0)

Network Status → DHCP Table

When I try to edit reserved IP entry I get the warning: This IP address is not included in the DHCP pool.

This happens when editing any field, that is Host Name, IP Address, MAC Address and Description.

The workaround is to remove the reserved IP (Unreserve) and add again with desired info.

Zyxel_Kay

Hi @bbp

We've identified that this issue occurs only when there is a single LAN interface configured on the device.

We're planning to include a fix for this bug in a future firmware release. Thank you for bringing this to our attention.

Please stay tuned for the latest firmware updates at https://community.zyxel.com/en/categories/security-gateway-news-and-release/ .

Zyxel_Kay

Hi @bbp

Could you please provide us with the following details to help us investigate further?

• DHCP Pool Settings: The exact start and end IP addresses of your DHCP pool.
• Reserved IP Address: The specific IP address you're trying to edit.
• Device Diagnostic File: Please collect this file via Maintenance > Diagnostic > Diagnostic. For privacy reasons, kindly share it with us through a private message.

Thank you!

bbp

Start IP: 192.168.11.60, Pool Size 88 (192.168.11.60-192.168.11.147)
Reserved IPs:
192.168.11.76 to 192.168.11.83
192.168.11.90
192.168.11.108 to 192.168.11.138
192.168.11.140 to 192.168.11.145

It happens to every reserved IP.

Diagnostics sent in private message.

bbp

Problem, diagnostic file is 56MB, private message attachment size is limited to 50MB.

Zyxel_Kay

Hi @bbp

Please try compressing the file or upload it to a cloud server and share the link with us through private msg.

bbp

https://community.zyxel.com/en/discussion/comment/68792#Comment_68792

Link sent. Thank you.

Zyxel_Kay

Hi @bbp

We tried to replicate the issue on our side, but we couldn't reproduce the problem you described. Could you please provide us with the following information?

1. A screen recording showing the steps you take to configure the reserved IP. For privacy reasons, please send the video via private message.
2. Can you confirm if you were able to edit the reserved IP successfully before, or did this issue suddenly appear after a configuration change? Also, without the workaround, is it still possible to apply the setting even when the error message appears?
3. For further troubleshooting, we may need WAN access to your device. I have sent you detailed instructions on how to configure WAN access via private message.

bbp

https://community.zyxel.com/en/discussion/comment/69051#Comment_69051

Hi @Zyxel_Kay

Check the private message

bbp

After some testing I think I know what is the problem.

My LAN network mask is set to 192.168.10.1/23, which is 192.168.10.0-192.168.11.255 range.

My DHCP pool is in 192.168.11.60-192.168.11.147 range. When I try to edit reserved IP, uOS is looking for IPs in 192.168.10.0/24 instead of 192.168.10.0/23 and gives me a message that IP is not included in DHCP pool. uOS should look for DHCP IPs in the whole /23 network range (if the network is /23), not only the first /24.

bbp

Also, if you change network mask, it will wipe out all reserved IP entries and applied default DHCP setting, regardless if DHCP pool was still within the specified network subnet.

Zyxel_Kay

Hi @bbp

We've identified that this issue occurs only when there is a single LAN interface configured on the device.

We're planning to include a fix for this bug in a future firmware release. Thank you for bringing this to our attention.

Please stay tuned for the latest firmware updates at https://community.zyxel.com/en/categories/security-gateway-news-and-release/ .