enable rx-udp-gro-forwarding tailscale

sudo nano /usr/local/bin/tailscale-ethtool.sh

---
#!/bin/bash
# Detect primary network interface
NETDEV=$(ip -o route get 8.8.8.8 | awk '{print $5}')
# Apply Tailscale UDP GRO optimization
/usr/sbin/ethtool -K $NETDEV rx-udp-gro-forwarding on rx-gro-list off
---

sudo chmod +x /usr/local/bin/tailscale-ethtool.sh

sudo nano /etc/systemd/system/tailscale-ethtool.service

---
[Unit]
Description=Optimize UDP GRO for Tailscale
After=network-online.target
Wants=network-online.target

[Service]
Type=oneshot
ExecStart=/usr/local/bin/tailscale-ethtool.sh
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target
sudo systemctl daemon-reload
sudo systemctl enable tailscale-ethtool
sudo systemctl start tailscale-ethtool
---


systemctl status tailscale-ethtool

# test
NETDEV=$(ip -o route get 8.8.8.8 | awk '{print $5}')
ethtool -k $NETDEV | grep rx-udp-gro-forwarding