IT Blog

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In this article, I’ll show you how to clear outdated logs from Loganalyzer.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

Setting up BIRD logs

In this article, I will give examples of setting up logs in BIRD.

How to set up RPZ in Bind9 (site blocking)

In this article, I will give a simple example of setting up RPZ in Bind9.
RPZ (Response Policy Zone) allows you to block access to malicious and prohibited sites by domain name, IP address or network, block DNS servers.

ABillS log rotation

Since some ABillS log files gradually increased in size, I wrote a script to rotate these logs.

Interface Aggregation (LAG) on Juniper MX

For example, I will configure interface aggregation on the Juniper MX204.

How to change favicon in Zabbix

I was once asked to change the Zabbix icon.