ip.addr == I always use this to quickly filter the ip address, I focus on. what transactions is related to it. ip.dst / ip.src If I know the destination and source Ip address, that is the command. I can narrow it down the flow. ip.flags.syc == 1 && ip.flags.ack == 1 As we know, TCP got 3 way handshake. With […]
Sometime You just got 1 SFP Module left, but you can get the switch working. But you found out, It is other brand SFP module, But Cisco can’t recognize it. With Cisco SFP Module Cisco SFP Module, it is just plug and play. After you insert your SFP Module, technically you will not have any issues Type “Show inventory” <– […]
Run TFTP Server in AWS – Ubuntu Upgrade switch/ Router frimware, you can use by USB/ TFTP USB – You can do Copy usbflash0: flash:latest firmware. Which is very useful, when there is 1 or 2 machine. TFTP – If you forget your USB, that’s okay. As the firmware is in the cloud. Figure 1.1 & 1.2 <- Create a […]
ALERT Network issues normally as we know, it will be ” I can’t Ping” or “I don’t have internet”. But it can caused by different problems. Using TCP/IP Model to troubleshoot from bottom to up or Up to Bottom. The problem is, you will need to spend time login to the device and put command to gather data for you […]
How to set it up? on 1 page to monitor and manage your network devices, you can think about AUVIK. Auvik got a free trial, then I clicked on it. Prepare your email & click Here we go. Prepare your email and sign up Prepare a name of your URL Prepare 1 machine neither Windows or linux as Auvik collector […]
WIFI for Guest Let’s say, There is a cafe inside your open office, and it is run by yourself. You can want to provide free WIFI to your customer when they enjoy your Coffee. Normally as we know. An Access point (“AP“) is connected to Switch, which is by Access port. We can assign it to a VLAN. So we […]
WHAT IS SWITCH Start from Small size company, 3 peoples ( HR, Accounting, Sales ) + yourself You just want to share your resources with different department In this case, you can use SWITCH to connect each computers. Statically given IP address to PC By Default , all port is VLAN 1 on the switch. No configuration is required on […]
Why do we need one – TFTP Server We always want to backup our Cisco switches/ routers configuration , as specially there is numbers of Switches/ Routers. When we just want to testing for some commands, but we entered ” write” ( copy running-config to start-up) by mistake. So we can using TFTP Server to store our configuration for your […]
Networking monitoring tool, there is quite many in the market. Solar winds, Datadog, icinga2 on Linux system. We use datadog in this post. Datadog is running on a website browse base, and also is required you to install “agent” in your OS. If you are interested to use for window, please visit their link below: Datadog Agent Manager for Windows […]
You may have tried using SSH connect a Virtual Machine (“VM”) in AWS/Azure/ GCP or others service provider , and their Data center is located somewhere in the world . or You want connect to a remote access network devices in the other city. So that mean, the traffic will go through public internet network, then reach this VM. Peoples […]
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