Linux – Page 4

How to specify a port for snmpwalk

Once I needed to perform snmpwalk with a non-standard SNMP port, since the devices that were polled were behind the same router, so the ports were forwarded to them.

BIRD BGP: Unexpected connect from unknown address

Once I set it up on a new BIRD server and noticed entries in the logs:

Messages net_ratelimit: X callbacks suppressed

Once I found the following messages in the dmesg log:

Solution write error: Value too large for defined data type

Once I manually bind the interrupts of the Intel network adapter to the processor cores and ran into an error:

Configuring OSPF in BIRD

In this article, I will give an example of configuring OSPF in BIRD.

Renaming Network Interfaces in Linux

Once, after updating the i40e driver for Intel network adapters, I noticed that the names of the network interfaces had changed, and after rebooting the operating system, the names also periodically changed.

Installing and configuring BIRD (BGP)

For example, I will install BIRD on Ubuntu Server 20.04 and show an example of configuring BGP.

Taskset – bind process to CPU cores

By default, processes use all the processor cores, but sometimes it is necessary to release the 0 core, which is usually the most loaded, or assign some processes only to the second CPU, etc., in this case, taskset will help.

Increase the port range net.ipv4.ip_local_port_range

There is a possibility that on a highly loaded server, such as a proxy or router, with a very large number of connections, free ports in the allocated range may run out, so you need to look at the current number used and, if necessary, increase the net.ipv4.ip_local_port_range value.

Clearing Loganalyzer History

In this article, I’ll show you how to clear outdated logs from Loganalyzer.