Created
January 24, 2026 07:07
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Script to setup tailscale port forwards on a ubiquity UDM after a firmware update.
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| set -euo pipefail | |
| LAN_CIDR="192.168.1.0/24" | |
| TS_CIDR="100.64.0.0/10" | |
| HOSTNAME="gg-home-udm" | |
| # Install Tailscale (post-firmware update it won't exist) | |
| if ! command -v tailscale >/dev/null 2>&1; then | |
| curl -fsSL https://tailscale.com/install.sh | sh | |
| fi | |
| # Ensure daemon is running (start only; no restart) | |
| systemctl start tailscaled || true | |
| # Bring Tailscale up (will print login URL if needed) | |
| tailscale up --hostname="$HOSTNAME" | |
| # Enable IPv4 forwarding | |
| sysctl -w net.ipv4.ip_forward=1 | |
| # Remove old rules (ignore if they don't exist) | |
| iptables -t nat -D POSTROUTING -s "$LAN_CIDR" -d "$TS_CIDR" -o tailscale0 -j MASQUERADE 2>/dev/null || true | |
| iptables -D FORWARD -s "$LAN_CIDR" -d "$TS_CIDR" -j ACCEPT 2>/dev/null || true | |
| iptables -D FORWARD -s "$TS_CIDR" -d "$LAN_CIDR" -j ACCEPT 2>/dev/null || true | |
| # Add rules (LAN -> Tailscale SNAT + allow forward) | |
| iptables -t nat -A POSTROUTING -s "$LAN_CIDR" -d "$TS_CIDR" -o tailscale0 -j MASQUERADE | |
| iptables -A FORWARD -s "$LAN_CIDR" -d "$TS_CIDR" -j ACCEPT | |
| iptables -A FORWARD -s "$TS_CIDR" -d "$LAN_CIDR" -j ACCEPT |
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