Commits on Apr 23, 2024

1. troubleshooting.md: add `ethtool -K flannel.1 tx-checksum-ip-generic … …

   …off` for NAT
   
   When the public IP is behind NAT, the UDP checksum fields of the VXLAN packets can be corrupted.
   In that case, try running the following commands to avoid corrupted checksums:
   
   ```bash
   /usr/sbin/ethtool -K flannel.1 tx-checksum-ip-generic off
   ```
   
   To automate the command above via udev, create `/etc/udev/rules.d/90-flannel.rules` as follows:
   
   ```
   SUBSYSTEM=="net", ACTION=="add|change|move", ENV{INTERFACE}=="flannel.1", RUN+="/usr/sbin/ethtool -K flannel.1 tx-checksum-ip-generic off"
   ```
   
   ref:
   - flannel-io/flannel issue 1279
   - kubernetes/kops PR 9074
   - karmab/kcli@b1a8eff
   
   Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

   

   AkihiroSuda committed Apr 23, 2024
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