install
source · Clone the upstream repo
git clone https://github.com/chaterm/terminal-skills
Claude Code · Install into ~/.claude/skills/
T=$(mktemp -d) && git clone --depth=1 https://github.com/chaterm/terminal-skills "$T" && mkdir -p ~/.claude/skills && cp -r "$T/linux/network-tools" ~/.claude/skills/chaterm-terminal-skills-network-tools && rm -rf "$T"
manifest:
linux/network-tools/SKILL.mdsource content
Network Tools and Diagnostics
Overview
Linux network diagnostics, port scanning, traffic analysis and other tool usage skills.
Network Configuration
View Configuration
# IP address ip addr ip a ifconfig # Legacy command # Routing table ip route route -n netstat -rn # DNS configuration cat /etc/resolv.conf systemd-resolve --status
Configure Network
# Temporary IP configuration ip addr add 192.168.1.100/24 dev eth0 ip addr del 192.168.1.100/24 dev eth0 # Enable/Disable interface ip link set eth0 up ip link set eth0 down # Add route ip route add 10.0.0.0/8 via 192.168.1.1 ip route del 10.0.0.0/8
Connectivity Testing
ping
ping hostname ping -c 4 hostname # Send 4 packets ping -i 0.2 hostname # 0.2 second interval ping -s 1000 hostname # Specify packet size
traceroute
traceroute hostname traceroute -n hostname # Don't resolve hostnames traceroute -T hostname # Use TCP mtr hostname # Real-time trace
DNS Query
nslookup hostname dig hostname dig +short hostname dig @8.8.8.8 hostname # Specify DNS server host hostname
Ports and Connections
ss Command (Recommended)
# Listening ports ss -tlnp # TCP listening ss -ulnp # UDP listening ss -tlnp | grep :80 # All connections ss -tanp # TCP connections ss -s # Statistics # Filter ss -t state established ss -t dst 192.168.1.1 ss -t sport = :80
netstat Command
netstat -tlnp # TCP listening netstat -ulnp # UDP listening netstat -anp # All connections netstat -s # Statistics
lsof Network
lsof -i # All network connections lsof -i :80 # Specific port lsof -i tcp # TCP connections lsof -i @192.168.1.1 # Specific host
HTTP Tools
curl
# Basic request curl http://example.com curl -I http://example.com # Headers only curl -v http://example.com # Verbose output # POST request curl -X POST -d "data=value" http://example.com curl -X POST -H "Content-Type: application/json" -d '{"key":"value"}' http://example.com # Download curl -O http://example.com/file.zip curl -o output.zip http://example.com/file.zip # Authentication curl -u user:pass http://example.com curl -H "Authorization: Bearer token" http://example.com
wget
wget http://example.com/file.zip wget -c http://example.com/file.zip # Resume download wget -r http://example.com # Recursive download wget --mirror http://example.com # Mirror site
Packet Capture
tcpdump
# Basic capture tcpdump -i eth0 tcpdump -i any # Filter tcpdump -i eth0 port 80 tcpdump -i eth0 host 192.168.1.1 tcpdump -i eth0 'tcp port 80 and host 192.168.1.1' # Save/Read tcpdump -i eth0 -w capture.pcap tcpdump -r capture.pcap # Display content tcpdump -i eth0 -A port 80 # ASCII tcpdump -i eth0 -X port 80 # Hexadecimal
Traffic Monitoring
# Real-time traffic iftop iftop -i eth0 # By process nethogs nethogs eth0 # Bandwidth test iperf3 -s # Server iperf3 -c server_ip # Client
Common Scenarios
Scenario 1: Troubleshoot Port Usage
# Check port usage ss -tlnp | grep :8080 lsof -i :8080 # Find process and handle kill -9 PID # Or fuser -k 8080/tcp
Scenario 2: Test Service Connectivity
# TCP port test nc -zv hostname 80 telnet hostname 80 # HTTP service test curl -I http://hostname curl -w "HTTP Code: %{http_code}\nTime: %{time_total}s\n" -o /dev/null -s http://hostname
Scenario 3: Network Performance Diagnosis
# Latency test ping -c 100 hostname | tail -1 # Route analysis mtr --report hostname # Bandwidth test iperf3 -c server -t 30
Troubleshooting
| Problem | Solution |
|---|---|
| Network unreachable | |
| DNS resolution failed | |
| Port unreachable | |
| Connection timeout | |
| Insufficient bandwidth | |