Tag Archives: Server

Application Based Bandwidth shaping in Cisco ROuter and switches.

Cisco IOS Implementations Cisco IOS implements policing/marking functionality with two unrelated mechanisms: The rate-limit command implements per-interface input- and output-rate limiting. The police command implements the traffic measurement within the scope of the Modular QoS Command Line Interface (MQC). Rate-limit commands and QoS policy-maps containing the police command can measure inbound or outbound packets on physical or logical interfaces (tunnels, subinterfaces). They introduce no delay (apart from… Read More »

Bandwidth Limiting / Shaping on Cisco Switch or Router Port.

When Internet Service Providers (ISP) gives a new internet link , very often they have shaping rules on their router to regulate internet traffic at promised rate. If your firewall/router/switch is sending more excessive traffic than promised rate, the packet will be dropped by ISP router, then ends up with suboptimal performance and slow internet speed. in this… Read More »

How to Shorten IPv6 Addresses.

An IPv6 address consists of 32 hexadecimal digits, in 8 sections of 4 digits each, separated by colons. It looks something like this: 1234:5678:90ab:cdef:1234:5678:90ab:cdef IPv6 addresses have several shortcuts that allow them to be compressed into smaller strings following certain rules. If there are any leading zeroes in a section, they may be left off. 0001:0001:0001:0001:0001:0001:0001:0001 could be written as 1:1:1:1:1:1:1:1. Any… Read More »

How To Check System Uptime in Linux Server.

if you want to check the uptime of your Linux server then there are a few commands which you can use effectively for collecting this information on system uptime. The first command which I prefer to use is uptime. Let’s look at the output given below. The second command is Top command. The third one is W Command.

Timestamp Ping & Save Log to the output file in Linux.

The ping command is one of the important network troubleshooting tools to test reachability between the source and destination. Timestamp ping is a great tool for troubleshooting the network because It will give you the ping report along with the time frame so that you can identify what was the issue at that particular time frame. in this… Read More »

How can I simulate delayed and dropped packets in Linux?

It’s really funny to degrade your network performance by yourself after adding a higher delay and packet loss on the link. Even 2 servers are directly connected with a cable within a 2-meter distance but still, you can add the delay or packet loss like they are 2000km apart from each other. To edit the network or link… Read More »

Useful Network Configuration & Troubleshooting Commands in Cent OS.

1-nmtui & nmcli commands. The Nmcli and Nmtui commands are used to configure network settings and also to manage network devices for creating, editing, and deleting the network connections in Cent OS. [root@localhost ~]# nmtui//The above command will open a GUI for you to edit the network connections.[root@localhost ~]# nmclieno2: connected to eno2 2-ARP Table If you want… Read More »

Useful Commands to Check RAM Memory Usage and Installed RAM in Centos Machine.

1-The below command will show you ,How much RAM is installed in your computer. 2-Free command will show you the total free memory amount, physically used and swap memory. 3-The top command is used to display memory and buffers information. 4-The vmstat command is used to see the memory statistics in which the user can view some additional… Read More »

Useful Commands to Check Hardware Architecture & System Information in Cent OS.

1-The uname -a will show you the system name and architecture of the machine ,network Host name etc .. 2-The lscpu command will give you the information about the cpu and processing units. 3-lshw -short command you can use for more information.

Useful Commands to Check the Cent OS Version .

1-This Command cat /etc/os-release will show you all the information of your OS. 2-hostnamectl is a command which you can use to find your CentOS branch. 3-You can use a command cat /etc/centos-release to see the centos release