Hi Matthew, Tested Ubuntu 24.04.4 LTS (noble) with 6.8.0-103-generic from -proposed.
Before testing, I reverted my netplan configuration to its original state (removed the explicit metric on the VLAN default route) and disabled my cron-based workaround that was flushing the route cache. This restores the original dual-default configuration that was triggering the regression. On 6.8.0-100-generic the issue reproduced: ip route get 8.8.8.8 intermittently returned “broadcast … cache <local,brd>”, and outbound UDP/ICMP failed with “Permission denied”. Flushing the route cache temporarily restored connectivity. On 6.8.0-103-generic the issue is not reproducing. Routing behaves correctly, ip route get returns a proper unicast route, and connectivity is stable after reboot. However, since this regression was intermittent in nature, I would like to let the system run for 24–48 hours without any workaround in place to confirm long-term stability before marking verification-done. I will report back with final confirmation after that observation period. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2142118 Title: Kernel 6.8.0-100: route cache corrupts external IPs as broadcast on systems with VLAN interfaces To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2142118/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
