On Tue, Oct 30, 2018 at 08:16:27PM -0000, Clemens Fuchslocher wrote: > Are there any workarounds for Ubuntu 16.04? > > Can I set /proc/sys/net/ipv6/conf/all/accept_ra to 0 to ignore the > Router Advertisements?
There are two settings: the accept_ra sysctl in the kernel, and IPv6AcceptRa= in systemd. The second setting can override the kernel setting, but it defaults to "use the kernel default". The kernel defaults to "enabled if local forwarding is disabled". So accept_ra=0 is honoured as long as IPv6AcceptRa= is *not* set to true. But the code where the error is is in the dhcpv6 client part. It can be triggered in two different ways: upon reception of a RA, or explicitly by using DHCP=yes or DHCP=ipv6. So both settings (accept_ra=/IPv6AcceptRa= and DHCP=) have to be set to 0/no to mitigate the issue. (Note though DHCP=no is the default.) This is my understanding, but I'm not too familiar with this code, so it'd be great if somebody could confirm. Zbyszek -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795921 Title: Out-of-Bounds write in systemd-networkd dhcpv6 option handling To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1795921/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
