๐ Advanced Networking
Deep-dive into Linux networking for DevOps and SRE.
๐ง Routing
| ip r
ip route add 10.0.0.0/24 via 192.168.1.1
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๐งฑ DNS Debugging
| dig example.com
nslookup example.com
systemd-resolve --status
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๐ง Packet Capture
| sudo tcpdump -i eth0 port 80
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๐งฉ Network Namespaces
| ip netns add test
ip netns exec test bash
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๐ฅ Firewall Debugging
| sudo iptables -L -v
sudo nft list ruleset
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๐จ Common Issues
- DNS misconfiguration
- Wrong gateway
- Firewall blocking traffic
- Docker network conflicts