I can confirm this bug. Since I'm running Debian on an embedded box with /var/log in a 5MB tmpfs, it's quite a problem for me.
It looks like there is a patch upstream which makes these messages debug-level instead of warning-level: https://dev.openwrt.org/browser/packages/ipv6/radvd/patches/100-RS-RA-warning-to-debug.patch?rev=27712 Can this be applied in the Debian tree? --Andrew
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