Custom image with ipv6 completely removed

For Developers
1

is it possible to build custom image with ipv6 completely removed using "Customize installed packages and/or first boot script" option in firmware selector page ?

1 Like
2

No, this can technically only be done when building from source, not using the imagebuilder. However, removing IPv6 support is not a supported configuration, you will encounter issues (with packaging expecting IPv6 support to be there and might even cause security issues with partial IPv6 support remaining present); any consequences of this are not considered to be a bug (it's explicitly not supported) and known to be partially broken.

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3

this doesnt work ?
https://openwrt.org/docs/guide-user/additional-software/saving_space#:~:text=In%20order%20to%20completely%20remove%20IPv6%20support%20and%20related%20packages%20you%20also%20need%20to%20ask%20the%20imagebuilder%20to%20do%20so%20by%20also%20passing%20this%20option%20to%20the%20make%20command%3A%20CONFIG_IPV6%3Dn.

4

It would be an extremely bad idea, as you remove the IPv6 firewall, while retaining kernel support for IPv6 (this is the part that must be rebuilt from source).

5

is there any guide documentation for building from source without ipv6 ?

6

No, as mentioned before, it's not a supported configuration, known to be partially broken - and you will encounter issues with it.

1 Like
7

so there is no ways to completely remove or disable ipv6 ?

8

Remove, no. Disable, only down to link-local.

But, why would you want to in the first place? OpenWrt's defaults for IPv6 are equivalent to the IPv4 firewall rules, IPv6 support is transparent, you shouldn't really notice it being there (and if your ISP doesn't support it yet, there is no harm either).

9

in my router using ipv6 cause this issue
Fri Dec 29 14:26:58 2023 kern.info kernel: [54072.081620] mt76x2e 0000:01:00.0: Firmware Version: 0.0.00
Fri Dec 29 14:26:58 2023 kern.info kernel: [54072.087106] mt76x2e 0000:01:00.0: Build: 1
Fri Dec 29 14:26:58 2023 kern.info kernel: [54072.091473] mt76x2e 0000:01:00.0: Build Time: 201607111443____
Fri Dec 29 14:26:58 2023 kern.info kernel: [54072.120440] mt76x2e 0000:01:00.0: Firmware running!
Fri Dec 29 14:26:58 2023 kern.info kernel: [54072.130494] ieee80211 phy1: Hardware restart was requested
this issue is occurs frequently with ipv6 enabled
but when i disable ipv6 from luci at least frequency of this error is reduced

10

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