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Linux Network Troubleshooting!ππ οΈ
20 essential Linux network troubleshooting commands, perfect for #DevOps engineers and #Linux admins. A Threadπ
20 essential Linux network troubleshooting commands, perfect for #DevOps engineers and #Linux admins. A Threadπ
1/π‘ ping:
Test network connectivity to a host.
Example:
ping google[dot]com
Explanation:
π Checks if you can reach a remote server.
Test network connectivity to a host.
Example:
ping google[dot]com
Explanation:
π Checks if you can reach a remote server.
2/ π ifconfig/ip addr:
View network interfaces and IP addresses.
Example:
ifconfig or ip addr show
Explanation:
π₯οΈ Lists network interfaces and their configurations.
View network interfaces and IP addresses.
Example:
ifconfig or ip addr show
Explanation:
π₯οΈ Lists network interfaces and their configurations.
3/π netstat/ss:
Display network statistics.
Example:
netstat -tuln or ss -tuln
Explanation:
π Shows active network connections and listening ports.
Display network statistics.
Example:
netstat -tuln or ss -tuln
Explanation:
π Shows active network connections and listening ports.
4/π traceroute/mtr:
Trace the route to a remote host.
Example:
traceroute google[dot]com or mtr google[dot]com
Explanation:
πΊοΈ Shows the path packets take to reach a destination.
Trace the route to a remote host.
Example:
traceroute google[dot]com or mtr google[dot]com
Explanation:
πΊοΈ Shows the path packets take to reach a destination.
5/πΉ nslookup/dig:
Query DNS for host information.
Example:
nslookup google[dot]com or dig google[dot]com
Explanation:
π Resolves domain names to IP addresses.
Query DNS for host information.
Example:
nslookup google[dot]com or dig google[dot]com
Explanation:
π Resolves domain names to IP addresses.
6/ πΆ ifup/ifdown:
Bring up/down network interfaces.
Example:
sudo ifdown eth0 or sudo ifup eth0
Explanation:
π΄ Enables or disables network interfaces.
Bring up/down network interfaces.
Example:
sudo ifdown eth0 or sudo ifup eth0
Explanation:
π΄ Enables or disables network interfaces.
7/ π§ iptables:
Configure firewall rules.
Example:
sudo iptables -L or sudo iptables -A INPUT -p tcp --dport 80 -j ACCEPT
Explanation:
π₯ Manages firewall rules and policies.
Configure firewall rules.
Example:
sudo iptables -L or sudo iptables -A INPUT -p tcp --dport 80 -j ACCEPT
Explanation:
π₯ Manages firewall rules and policies.
8/π΅οΈ tcpdump:
Capture network packets for analysis.
Example:
sudo tcpdump -i eth0 port 80
Explanation:
π¦ Sniffs and logs network traffic on a specific interface.
Capture network packets for analysis.
Example:
sudo tcpdump -i eth0 port 80
Explanation:
π¦ Sniffs and logs network traffic on a specific interface.
9/π¦ route:
Display or manipulate routing table.
Example:
route -n or sudo route add default gw 192.168.1.1
Explanation:
π Shows and manages routing information.
Display or manipulate routing table.
Example:
route -n or sudo route add default gw 192.168.1.1
Explanation:
π Shows and manages routing information.
10/ π arp/ip neigh:
View and manipulate ARP cache.
Example:
arp -n or ip neigh show
Explanation:
π Lists ARP table entries, useful for MAC address resolution.
View and manipulate ARP cache.
Example:
arp -n or ip neigh show
Explanation:
π Lists ARP table entries, useful for MAC address resolution.
11/ π iftop:
Monitor network bandwidth usage.
Example:
sudo iftop -n
Explanation:
π Displays real-time bandwidth usage by network interface.
Monitor network bandwidth usage.
Example:
sudo iftop -n
Explanation:
π Displays real-time bandwidth usage by network interface.
12/ π netcat/nc:
Create network connections.
Example:
nc -vz google[dot]com 80
Explanation:
π Checks if a specific port on a host is open.
Create network connections.
Example:
nc -vz google[dot]com 80
Explanation:
π Checks if a specific port on a host is open.
13/ π curl/wget:
Download files from the internet.
Example:
curl -O https://example[dot]com/file[dot]txt or wget https://example[dot]com/file[dot]txt
Explanation:
π₯ Retrieves files from web servers.
Download files from the internet.
Example:
curl -O https://example[dot]com/file[dot]txt or wget https://example[dot]com/file[dot]txt
Explanation:
π₯ Retrieves files from web servers.
14/ π ssh:
Securely access remote systems.
Example:
ssh username@hostname
Explanation:
π‘οΈ Establishes a secure shell connection to a remote server.
Securely access remote systems.
Example:
ssh username@hostname
Explanation:
π‘οΈ Establishes a secure shell connection to a remote server.
15/ π‘οΈ nmap:
Scan for open ports on a host.
Example:
nmap -p 1-1000 192.168.1.1
Explanation:
πͺ Detects open ports and services on a target system.
Scan for open ports on a host.
Example:
nmap -p 1-1000 192.168.1.1
Explanation:
πͺ Detects open ports and services on a target system.
16/ π iftop:
Display bandwidth usage by host.
Example:
sudo iftop -n -i eth0
Explanation:
π Shows network traffic sorted by source/destination.
Display bandwidth usage by host.
Example:
sudo iftop -n -i eth0
Explanation:
π Shows network traffic sorted by source/destination.
17/ π route:
Manipulate kernel routing table.
Example:
sudo route add -net 192.168.2.0/24 gw 192.168.1.1
Explanation:
π Adds custom routes for network traffic.
Manipulate kernel routing table.
Example:
sudo route add -net 192.168.2.0/24 gw 192.168.1.1
Explanation:
π Adds custom routes for network traffic.
18/ π‘ arping:
Send ARP requests to a host.
Example:
sudo arping -I eth0 192.168.1.2
Explanation:
π Checks if a host is reachable within the local network.
Send ARP requests to a host.
Example:
sudo arping -I eth0 192.168.1.2
Explanation:
π Checks if a host is reachable within the local network.
19/ π οΈ ethtool:
Query and configure network interface settings.
Example:
sudo ethtool eth0
Explanation:
π₯οΈ Displays and configures Ethernet adapter properties.
Query and configure network interface settings.
Example:
sudo ethtool eth0
Explanation:
π₯οΈ Displays and configures Ethernet adapter properties.
20/ π nmcli:
Manage NetworkManager connections.
Example:
nmcli connection show or nmcli connection up MyConnection
Explanation:
π Interact with NetworkManager for network setup.
Manage NetworkManager connections.
Example:
nmcli connection show or nmcli connection up MyConnection
Explanation:
π Interact with NetworkManager for network setup.
Remember to use these commands with caution, and many may require superuser privileges (sudo).
#Linux #Networking #SysAdmin #DevOps π»π
#Linux #Networking #SysAdmin #DevOps π»π
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https://twitter.com/devops_tech/status/1700080779542597912?s=20
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