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docs/linux/network.md

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+
+# Network
+
+## ipset
+```bash
+# Create ip-list with timeout
+ipset create ipl-name hash:ip timeout 3600
+```
+
+## iptables
+```bash
+# Show current rules
+iptables -L -vn
+
+# Fix TTL for mobile network
+iptables -t mangle -A POSTROUTING -j TTL --ttl-set 65
+```