Advanced Troubleshooting
Network Namespace Management
Creating Network Namespaces
## Create a new network namespace
sudo ip netns add testing_ns
## List existing network namespaces
ip netns list
Namespace Interaction
## Execute command in specific namespace
sudo ip netns exec testing_ns ip addr
Complex Routing Scenarios
Multi-Table Routing
## Create custom routing table
echo "200 custom_route" | sudo tee -a /etc/iproute2/rt_tables
## Add route to custom table
sudo ip route add 192.168.2.0/24 dev eth1 table custom_route
Bandwidth and Latency Analysis
## Monitor network interface statistics
ip -s link show eth0
## Detailed interface statistics
ip -s -d link show eth0
Advanced Routing Techniques
Policy-Based Routing
## Create routing rule
sudo ip rule add from 192.168.1.0/24 table 200
Troubleshooting Workflow
graph TD
A[Advanced Network Issue] --> B{Diagnostic Strategy}
B --> C[Namespace Isolation]
B --> D[Complex Routing Analysis]
B --> E[Performance Monitoring]
B --> F[Policy Verification]
Network Configuration Validation
Tool |
Purpose |
Command |
ip |
Network configuration |
ip addr , ip route |
ss |
Socket statistics |
ss -tunap |
tc |
Traffic control |
tc qdisc show |
Network Debugging Techniques
Packet Capture and Analysis
## Capture packets at interface level
sudo ip monitor all
## Track routing changes
sudo ip route monitor
Advanced Network Isolation
Virtual Ethernet Pairs
## Create virtual ethernet pair
sudo ip link add veth0 type veth peer name veth1
## Assign namespaces to virtual interfaces
sudo ip link set veth0 netns ns1
sudo ip link set veth1 netns ns2
Traffic Control
## Set up bandwidth limitation
sudo tc qdisc add dev eth0 root tbf rate 1mbit burst 32kbit latency 300ms
Logging and Monitoring
System Log Analysis
## Check network-related system logs
journalctl -u systemd-networkd
LabEx Learning Strategy
Practice advanced network troubleshooting techniques in LabEx's simulated environments to develop real-world skills.
Key Troubleshooting Principles
- Systematic approach
- Understand network topology
- Use multiple diagnostic tools
- Isolate and verify each component
- Document configuration changes
Common Advanced Scenarios
Complex Network Configurations
- Multi-homed systems
- Software-defined networking
- Container network management
- Bandwidth limitations
- Routing inefficiencies
- Network namespace conflicts