Security – IT Blog

Testing a DHCP server with dhcpperf

dhcpperf is a DHCP load testing tool.

High CPU load on Cisco Nexus 3064

Once I discovered on the graphs a large burst of Multicast packets on one of the ports of the Cisco Nexus 3064 switch, while the CPU load increased to 30%, before that it was 12% with L2 traffic of 13 Gbit/s.

Description of DNS Amplification Attacks

In this article, I will briefly describe the principle of DDoS DNS Amplification attacks.

Configuring OCSP Stapling

OCSP is a protocol for checking the validity of certificates, that is, to make sure that they have not been revoked and whether they were actually issued. Enabling OCSP Stapling on the web server side allows you to increase the speed of site opening, since the request to the certification authority is made not by the browser, but by the web server.

Displaying SNMP Traps about Loop Detect in Zabbix

In this article, I will give an example of SNMP Traps display about Loop Detect in Zabbix.

Using BNG Blaster

BNG Blaster is a testing tool, it can create thousands of virtual PPPoE and IPoE clients to test the performance of access servers, it also supports IGMP, QinQ, IPv6, etc.

Blocking SPAM behind a NAT server

In this article I will give an example of detecting and blocking the sending of spam messages behind a NAT server.

Installing and configuring Aircrack-ng

Aircrack-ng is a set of programs designed to detect wireless networks, intercept traffic transmitted over wireless networks, audit WEP and WPA/WPA2-PSK encryption keys (strength test).
Official site: www.aircrack-ng.org

Privoxy Web Proxy

Privoxy is a free web proxy with advanced features.

Changing User Agent data

To edit the settings, type in the address bar of the Mozilla Firefox browser: