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Show dropped packets per interface on Linux - Methiods to check it
This article covers how to Show dropped packets per interface on Linux.
There can be various reasons for packet loss. It can be that the network transport is unreliable and packet loss is natural, the network link could be congested, applications cannot handle the offered load.
Sometimes there are too many packets, they are saved to a buffer, but they are saved faster than processed, so eventually the buffer runs out of space, so the kernel drops all further packets until there is some free space in the buffer.
You will learn the different Linux commands to see packet loss on Linux per-interface, including excellent tools such as dropwatch.
We can also use Linux profiling with performance counters utility called perf.
To display show dropped packets per interface on Linux using the netstat:
The netstat command is mostly obsolete. Replacement for netstat is ss and ip command.
However, netstat still available on older Linux distros, which are in productions.
Hence, I will start with netstat but if possible, use the ip/ss tools.
The command in Linux is:
$ netstat -i
$ netstat --interfaces
To display summary statistics for each protocol, run:
$ netstat -s
$ netstat --statistics
To show dropped packets statistics per network interface on Linux using the ip:
Let us see how to see link device stats using the ip command.
The syntax is:
$ ip -s link
$ ip -s link show {interface}
$ ip -s link show eth0
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