CentOS 8.x iproute2 basics
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See network connection information
To see list of network connections use:
ss -anp
where options mean
- -a
- All listening + established port details
- -n
- Do not resolve service names, hostnames, etc.
- -p
- Show owning process ID
For further filtering you can consider using:
- -t
- Show only tcp sockets
- -u
- Show only udp sockets
- -x
- Show only unix sockets
- -4
- Show only IPv4 information
- -6
- Show only IPv6 information
- -l
- Show only listening sockets
See no. of established connections per IP
To see no. of established connections per IP use:
ss -at | grep ESTAB | awk '{print $5}' | cut -d":" -f1 | sort | uniq -c | sort -n
- Also see OpenSuse Leap 15 iproute2 basics
- There are a few older articles at IP routing 2 configuration
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