Port Mirroring

Port mirroring is an approach to monitoring network traffic that involves forwarding a copy of each packet from one network switch port to another.
Port mirroring enables the administrator to keep close track of switch performance by placing a protocol analyzer on the port that's receiving the mirrored data.
An administrator configures port mirroring by assigning a port from which to copy all packets and another port to which those packets will be sent. A packet bound for -- or heading away from -- the first port will be forwarded to the second port as well. The administrator must then place a protocol analyzer on the port that's receiving the mirrored data to monitor each segment separately.
Network administrators can use port mirroring as a diagnostic or debugging tool. 

Comments

Post a Comment

Popular posts from this blog

KVM & Qemu

QEMU is a powerful emulator, which means that it can emulate a variety of processor types. Xen uses QEMU for HVM guests, more specifically for the HVM guest's device model. The Xen-specific QEMU is called qemu-dm (short for QEMU device model) QEMU uses emulation; KVM uses processor extensions (intel-VT) for virtualization. Both Xen and KVM merge their various functionality to upstream QEMU, that way upstream QEMU can be used directly to accomplish Xen device model emulation, etc. Xen is unique in that it has paravirtualized guests that don't require hardware virtualization. Both Xen and KVM have paravirtualized device drivers that can run on top of the HVM guests. The QEMU hypervisor is very similar to the KVM hypervisor. Both are controlled through libvirt, both support the same feature set, and all virtual machine images that are compatible with KVM are also compatible with QEMU. The main difference is that QEMU does not support native virtualization. Consequently, QEMU has ...
Read more

PHP Fatal error: Class 'JFactory' not found

I have faced this issue in Joomla site and searched the forums but none of the forums including joomla did not give solution for me. They simply suggest to check joomla version, php version compatibility and php extensions. Finally I have fixed the issue. Issue:- ---------  [26-Sep-2014 18:11:29 Europe/Berlin] PHP Fatal error: Class 'JFactory' not found in /home/test/public_html/index.php on line 31 Cause & Solution:- ----------------------- In my case, it seems file which gives the class JFactory was missed. /home/test/public_html/libraries/joomla/factory.php --->Core file for Joomla. Simply restore that file under proper path to fix the issue.
Read more

docker.errors.APIError: 400 Client Error client is newer than server

You can face this issue when you are trying to use docker python library. Error: docker.errors.APIError: 400 Client Error: Bad Request for url: http+docker://localunixsocket/v1.26/images/json?only_ids=0&all=0 ("client is newer than server (client API version: 1.26, server API version: 1.24)") Solution: client= docker.from_env(version='auto') Use parameter "version" when instantiating a client.
Read more