Solution ZEBRA: netlink-listen recvmsg overrun: No buffer space available

Once on the server with Quagga after adding several thousand network interfaces, I noticed a message in the logs /var/log/zebra.log:

ZEBRA: netlink-listen recvmsg overrun: No buffer space available

Looked at the current values (I everywhere was 212992):
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Installation and information about Midnight Commander on Linux

To install Midnight Commander in Ubuntu/Debian, just run:

sudo apt-get install mc

To install on CentOS:

yum install mc

For start:
mc

I will describe some shortcuts while working in Midnight Commander:
Ctrl+O Switch between command line and mc.
Ctrl+l Updates all displayed information.
Ctrl+x c Runs the Chmod command for the selected object.
Ctrl+x o Runs the Chown command for the selected object.
Ctrl+x l Runs the command to create a hard link.
Ctrl+x s Runs the command to create a symbolic link.
Ctrl+x i Switches the passive panel to the “Information” mode.
Ctrl+x q Switches the passive panel to quick view.
Ctrl+x ! The menu item “Paneling Criteria” is executed.
Ctrl+x h Add the directory name to the “Directory”.
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Speed limit on network interface using TC

I will give an example of a speed limit of up to 3.3 Gb/s on a network interface on Ubuntu Server 16.04:

/sbin/tc qdisc del dev ens2f0 parent ffff:
/sbin/tc qdisc add dev ens2f0 handle ffff: ingress
/sbin/tc filter add dev ens2f0 parent ffff: protocol ip prio 50 u32 match ip dst 0.0.0.0/0 police rate 3300mbit burst 330k mtu 30000 drop flowid 1:0

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