IT Blog - Page 13 of 153 - Vyacheslav Gapon - personal blog, manuals, articles, notes, development

Script to bind Intel NIC interrupts to processor cores

I will give the script code from Intel to bind interrupts of Intel network adapters to processor cores, and also show examples of its use:

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.

Solution channel-group command failed: port not compatible Duplex Mode

Once on Cisco Nexus I met errors of this type:

Juniper. How to clear Alarm Host 0 fxp0 : Ethernet Link Down

One day while configuring the Juniper MX204, I noticed that the Alarm indicator on the front panel was lit red, and looking at the list of alarms, I found the following:

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In this article, I’ll show you how to clear outdated logs from Loganalyzer.

Juniper. monitor traffic examples

The “monitor traffic” command allows you to view the packets or their headers that pass through the routing module, which is very useful for diagnosing various problems.

Cisco Nexus SNMP OID for Transceiver

Once I needed to monitor the optical signal level on the Cisco Nexus C3064PQ-10GX to prevent cable sagging, stretching and signal loss, because in this case the signal deteriorates gradually, usually I monitor the signal on the end equipment, but I came across an old BDCOM 3310B model in which there was no support DDM.

1C Unknown error (SMTP error code 3)

One day I was informed that the accounting department on one of the computers could not send invoices by email.