From: Baptiste Jonglez <g...@bitsofnetworks.org> ULA IPv6 prefixes (Unique Local Addresses, RFC 4193) are not routable on the Internet. As such, they have very limited use, and enabling them by default causes more problems than it solves:
- if an OpenWrt device already has external IPv6 connectivity with globally routable addresses, then ULA addresses are not useful. - if an OpenWrt device has no external IPv6 connectivity, then ULA addresses could be useful for local IPv6 communication on the LAN; however, link-local IPv6 addresses already provide such a service without needing any configuration or even the need for a router. Discovery protocols based on IPv6 multicast and link-local addresses are becoming more common (e.g. syncthing) and don't need ULA to work. - users might be confused to see multiple unrelated IPv6 addresses on their devices. Or they might wrongly conclude that they have IPv6 connectivity thanks to ULA addresses, while in fact ULA addresses are not globally routable. - there have been various bug reports [1, 2, 3] in 19.07 and 21.02 where ULA addresses basically break global IPv6 connectivity. These bugs have not been solved in several years, indicating a probable lack of interest for ULA from the OpenWrt developer community. ULA addresses are still supported, e.g. by setting network.globals.ula_prefix='auto' in a uci-defaults script that runs before "12_network-generate-ula", or by directly setting network.globals.ula_prefix to a /48 prefix. [1] https://github.com/openwrt/openwrt/issues/5082 [2] https://forum.openwrt.org/t/router-can-use-ipv6-ok-but-clients-in-lan-cannot/57587 [3] https://lafibre.info/ipv6/saison-2-openwrt-slaac-problemes/ Signed-off-by: Baptiste Jonglez <g...@bitsofnetworks.org> --- package/base-files/files/bin/config_generate | 7 ------- 1 file changed, 7 deletions(-) diff --git a/package/base-files/files/bin/config_generate b/package/base-files/files/bin/config_generate index 596fcf41fa..f0ea4b6eb2 100755 --- a/package/base-files/files/bin/config_generate +++ b/package/base-files/files/bin/config_generate @@ -45,13 +45,6 @@ generate_static_network() { set network.loopback.ipaddr='127.0.0.1' set network.loopback.netmask='255.0.0.0' EOF - [ -e /proc/sys/net/ipv6 ] && { - uci -q batch <<-EOF - delete network.globals - set network.globals='globals' - set network.globals.ula_prefix='auto' - EOF - } if json_is_a dsl object; then json_select dsl -- 2.30.2 _______________________________________________ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/mailman/listinfo/openwrt-devel
