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About this blog

This blog is going to focus on sharing how to capture data mainly using tcpdump, wireshark and whatever else anyone contributes but the focus is capturing data for the purpose of troubleshooting.

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A tcpdump Tutorial with Examples

Just about any appliance you receive from the Enterprise world it comes with tcpdump, especially if the host operating system is linux based.  Here are some commands that I run that have proven helpful and they may prove to help you as well.  My main use is on our F5 appliances or our linux application servers. Below you will find different uses of tcpdump NO DNS RESOLUTION To disable name resolution, use the -n flag as in the following examples: tcpdump -n tcpdump -ni 0.0


rev.dennis in tcpdump

Install Zabbix on CentOS 7

Ran into a ton of issues using Cacti (mainly no one really supports the templates, plugins, etc for F5) so I'm trying a different flavor of monitoring solution called Zabbix which is another open source monitoring solution that has a few articles referencing F5 and a lot of the articles I'm finding are more recent (2017 and newer) where Cacti was pre 2017. So let's start with some instructions Install the Zabbix Repository Download the RPM wget https://repo.zabbix.com/zabbix/4


rev.dennis in monitoring

Installing Cacti on CentOS 7

Seems like this should be easy, especially since there is a yum install for cacti but oh no, nothing is what it seems.  If you follow the below instructions (well as of January 2020) then you have a good chance at being successful.  Please note, this is best case and no guarantee it will work but it worked for me.  This also will help me keep track of some helpful commands I used for the future. DISABLE FIREWALL Open and edit SELinux configuration file. vim /etc/sysconfig/selinux


guru in monitoring

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