50 lines
1.7 KiB
Bash
Executable File
50 lines
1.7 KiB
Bash
Executable File
#!/bin/bash
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# Comprehensive CGNAT and IPv6 connectivity checker for Linux
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# ----------- Public IPs -----------
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PUBLIC_IPV4=$(curl -4 -s https://ifconfig.me)
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PUBLIC_IPV6=$(curl -6 -s https://ifconfig.me)
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# ----------- Local Interface Info -----------
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WAN_IF=$(ip route show default | awk '/default/ {print $5}')
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LOCAL_IPV4=$(ip -4 addr show "$WAN_IF" | awk '/inet / {print $2}' | cut -d/ -f1)
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LOCAL_IPV6=$(ip -6 addr show "$WAN_IF" | awk '/inet6 / && !/fe80/ {print $2}' | cut -d/ -f1)
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echo "===== CGNAT / IPv6 Check ====="
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echo "Network interface: $WAN_IF"
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echo
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echo "Local IPv4: $LOCAL_IPV4"
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echo "Public IPv4: $PUBLIC_IPV4"
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echo
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echo "Local IPv6: $LOCAL_IPV6"
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echo "Public IPv6: $PUBLIC_IPV6"
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echo
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echo "--------------------------------"
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# ----------- IPv4 Analysis -----------
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if [[ -z "$PUBLIC_IPV4" ]]; then
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echo "🌐 No public IPv4 address detected (possibly IPv6-only connection)."
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elif [[ "$LOCAL_IPV4" =~ ^10\. || "$LOCAL_IPV4" =~ ^192\.168\. || "$LOCAL_IPV4" =~ ^172\.(1[6-9]|2[0-9]|3[0-1])\. || "$LOCAL_IPV4" =~ ^100\.(6[4-9]|[7-9][0-9]|1[0-1][0-9]|12[0-7])\. ]]; then
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if [ "$PUBLIC_IPV4" != "$LOCAL_IPV4" ]; then
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echo "⚠️ Your local IPv4 ($LOCAL_IPV4) is private, and your public IPv4 differs."
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echo "➡️ You are likely behind CGNAT or another NAT layer."
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else
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echo "✅ Local and public IPv4 match — you have a public IPv4 address."
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fi
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else
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echo "✅ Local IPv4 appears to be public ($LOCAL_IPV4). No CGNAT detected."
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fi
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echo "--------------------------------"
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# ----------- IPv6 Analysis -----------
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if [[ -n "$PUBLIC_IPV6" ]]; then
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echo "✅ Public IPv6 is active — your device has global IPv6 connectivity."
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else
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echo "❌ No global IPv6 address detected."
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fi
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echo "--------------------------------"
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echo "Done."
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