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

bbp
bbp Posts: 66  Ally Member
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in USG FLEX H Series

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.

not_in_pool.png

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.

Accepted Solution

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  • Zyxel_Kay
    Zyxel_Kay Posts: 1,199  Zyxel Employee
    Zyxel Certified Network Engineer Level 2 - Nebula Zyxel Certified Network Engineer Level 2 - WLAN Zyxel Certified Network Engineer Level 2 - Switch Zyxel Certified Network Engineer Level 2 - Security

    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!

    Kay

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  • bbp
    bbp Posts: 66  Ally Member
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    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
    bbp Posts: 66  Ally Member
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    Problem, diagnostic file is 56MB, private message attachment size is limited to 50MB.

  • Zyxel_Kay
    Zyxel_Kay Posts: 1,199  Zyxel Employee
    Zyxel Certified Network Engineer Level 2 - Nebula Zyxel Certified Network Engineer Level 2 - WLAN Zyxel Certified Network Engineer Level 2 - Switch Zyxel Certified Network Engineer Level 2 - Security

    Hi @bbp

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

    Kay

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  • bbp
    bbp Posts: 66  Ally Member
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    https://community.zyxel.com/en/discussion/comment/68792#Comment_68792

    Link sent. Thank you.

  • Zyxel_Kay
    Zyxel_Kay Posts: 1,199  Zyxel Employee
    Zyxel Certified Network Engineer Level 2 - Nebula Zyxel Certified Network Engineer Level 2 - WLAN Zyxel Certified Network Engineer Level 2 - Switch Zyxel Certified Network Engineer Level 2 - Security

    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.

    Kay

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  • bbp
    bbp Posts: 66  Ally Member
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    https://community.zyxel.com/en/discussion/comment/69051#Comment_69051

    Hi @Zyxel_Kay

    Check the private message

  • bbp
    bbp Posts: 66  Ally Member
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    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
    bbp Posts: 66  Ally Member
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    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
    Zyxel_Kay Posts: 1,199  Zyxel Employee
    Zyxel Certified Network Engineer Level 2 - Nebula Zyxel Certified Network Engineer Level 2 - WLAN Zyxel Certified Network Engineer Level 2 - Switch Zyxel Certified Network Engineer Level 2 - Security
    Answer ✓

    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/ .

    Kay

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