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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