When your Linux server seems to have network issues, you should be able to log in via VNC console to troubleshoot the issue
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ping google.com
PING google.com (200.0.000.000) 56(84) bytes of data.
64 bytes from par.net (200.0.000.000): icmp_seq=1 ttl=117 time=21.4 ms
64 bytes from par.net (200.0.000.000): icmp_seq=2 ttl=117 time=23.6 ms
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mtr google.com
My traceroute [v0.92]
hostname (0.0.0.0) Thu Jun 21 12:00:00 2024
Keys: Help Display mode Restart statistics Order of fields quit
Packets Pings
Host Loss% Snt Last Avg Best Wrst StDev
1. router1 0.0% 5 1.0 1.2 0.9 1.5 0.2
2. isp-router 0.0% 5 9.1 10.2 8.3 12.5 1.2
3. destination-router 0.0% 5 20.5 15.9 14.3 20.5 2.0
4. google.com 0.0% 5 21.7 18.3 17.1 21.7 1.8 |
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netstat # Display all the active network connections, routing tables, and interface statistics on your Linux system.
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This helps in understanding what applications or daemons are running and potentially causing issues, crucial for troubleshooting port conflicts or unauthorized services running on unexpected ports. Useful in verifying firewall rules and monitoring for unauthorized services or suspicious network activity |
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netstat -tulpn #shows all programs listening for connections, along with their details like ports and IDs, using numbers instead of names. Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 127.0.0.53:53 0.0.0.0:* LISTEN - tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN - tcp 0 0 127.0.0.1:46565 0.0.0.0:* LISTEN 1616/eidLvUIServer tcp6 0 0 :::45623 :::* LISTEN 71127/AppRun.wrappe tcp6 0 0 :::5061 :::* LISTEN 71127/AppRun.wrappe tcp6 0 0 ::1:631 :::* LISTEN - tcp6 0 0 :::1716 :::* LISTEN 1614/kdeconnectd udp 0 0 0.0.0.0:52881 0.0.0.0:* - |
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