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--- Begin Message ---> On Dec 11, 2025, at 12:41 AM, Jonas Lochmann <[email protected]> wrote: > > Am Wed, Dec 10, 2025 at 08:44:00PM -0700, schrieb Philip Prindeville via > openwrt-devel: > >> I previously tested with -z “$(ip -6 -o route show default)” but as someone >> pointed out, if at the time that Bind starts up, someone later brings up an >> IPv6 default route (say via DHCP or a tunnel), then this caused a denial of >> service. >> >> I don’t imagine this is the only case of having to know if IPv6 is >> deliberately absent on a given router or not. >> >> What is the best canonical way to solve this? > > Happy Eyeballs - just try it and see if it works. It would expect bind > to do exactly that. Sorry, try which out? > > You can ask the routing table or ask netifd. Both are observable (change > notifications are available) so that you could adjust your configuration > depending on the current status. But the existence of an IPv6 default > route does not imply that it works. mwan uses configurable connectivity > checks to solve that issue - in most setups, this are pings to some > predefined servers. I’m open to other ideas. -Philip
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