networkd: Add settings for Calico's IP-in-IP tunnel#26
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pothos merged 1 commit intoflatcar-masterfrom Sep 11, 2020
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The tunnel interface tunl0 was getting the default setup of DHCP and TX offload. Since Calico set up the IP address, the interface was working but thought to be in "configuring" state by networkd which is harmless but still not optimal. Recently the TX offload caused Pod-to-Pod communication through the tunnel to break because the checksums were not calculated. Set the tunnel interface to be not managed by networkd's default setup with DHCP. Disable the TX offload to enforce checksum calculation. See flatcar/Flatcar#183
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LGTM, thanks! Please cherry-pick the build recipe update in coreos-overlay to flatcar-2605, too.
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dracut: issue a kernel panic on dm-verity corruption
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The tunnel interface tunl0 was getting the default setup of DHCP
and TX offload. Since Calico set up the IP address, the interface
was working but thought to be in "configuring" state by networkd
which is harmless but still not optimal. Recently the TX offload
caused Pod-to-Pod communication through the tunnel to break because
the checksums were not calculated.
Set the tunnel interface to be not managed by networkd's default
setup with DHCP. Disable the TX offload to enforce checksum
calculation.
See flatcar/Flatcar#183
How to use
Schedule two Kubernetes Pods on one node each with Calico and send UDP or TCP packets.
Testing done
The files were manually placed on the node under
/etc/systemd/network.