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Not allowed to create /128 unnumbered or loopback IPv6 address #8205

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opened 2025-12-29 20:33:47 +01:00 by adam · 1 comment
adam commented 2025-12-29 20:33:47 +01:00
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Originally created by @Nemavio on GitHub (Jun 17, 2023).

NetBox version

v3.5.3

Python version

3.11

Steps to Reproduce

  1. Click on "Add" on "IP Addresses"
  2. Enter an IPv6 address like 2a0e:FFFF:43::1/128
  3. (optional : Assign an interface for this IP)
    image

Expected Behavior

Like IPv4 address, we can have /128 IPv6 unnumbered IP Address or just classic IPv6 loopback address on router, VM, server... it should not fail.

Observed Behavior

Got an error : " 2a0e:ffff:43::1/128 is a broadcast address, which may not be assigned to an interface."

Originally created by @Nemavio on GitHub (Jun 17, 2023). ### NetBox version v3.5.3 ### Python version 3.11 ### Steps to Reproduce 1. Click on "Add" on "IP Addresses" 2. Enter an IPv6 address like 2a0e:FFFF:43::1/128 3. (optional : Assign an interface for this IP) ![image](https://github.com/netbox-community/netbox/assets/4148215/5adb1723-60e8-442b-b758-c1238e5c7d0c) ### Expected Behavior Like IPv4 address, we can have /128 IPv6 unnumbered IP Address or just classic IPv6 loopback address on router, VM, server... it should not fail. ### Observed Behavior Got an error : " 2a0e:ffff:43::1/128 is a broadcast address, which may not be assigned to an interface."
adam added the status: duplicate label 2025-12-29 20:33:47 +01:00
adam closed this issue 2025-12-29 20:33:47 +01:00
adam commented 2025-12-29 20:33:47 +01:00
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@abhi1693 commented on GitHub (Jun 17, 2023):

I'm able to create the address without any issue

image

And, the interface assignment issue was fixed in 34f5363a2e which is yet to be released.

This issue has already been addressed in https://github.com/netbox-community/netbox/issues/12812.

Unless, I'm understanding the issue wrong, I'm going to close this out as duplicate. Feel free to ping me if your issue is different.

@abhi1693 commented on GitHub (Jun 17, 2023): I'm able to create the address without any issue ![image](https://github.com/netbox-community/netbox/assets/5083532/2ea35ca0-f2de-407b-97d0-972127de3fa8) And, the interface assignment issue was fixed in https://github.com/decoupca/netbox/commit/34f5363a2ef79b817fbfbc8a2e9b42bf414d755e which is yet to be released. This issue has already been addressed in https://github.com/netbox-community/netbox/issues/12812. Unless, I'm understanding the issue wrong, I'm going to close this out as duplicate. Feel free to ping me if your issue is different.
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Reference: starred/netbox#8205
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