Virtual Router Forwarding (“VRF“), It allows router to have many logical routing tables. Services Provider they take this as advantage on it with MPLS, so as to separate the network to Customers. VLAN = VRF? Virtual Local Area network & Virtual Router Forwarding, they are both separating the network. BUT 1 is in Layer 2 1 is in Layer 3 […]
Why do we need GRE Tunnel GRE Tunnel, it Encapsulate the packet which is quite similiar with VPN IPSEC. GRE Tunnel can support Dynamic Routing protocol through the tunnel, it is the reason why it takes an advantages. In DMVPN, GRE will play its role. Another advantage of GRE Tunnel, is easiler to be configured. CONFIGURATION Between R1-R2-R3 both has […]
WHAT DO WE NEED TO KNOW CISCO MERAKI has different variety product. Mostly I use is Security appliance, Wireless & Switch. Mainly they are cloud base product which mean. Without internet, it is not much you can do on the devices. Such as you can change vlan trunk/ access or add DHCP on Security appliance. But you can configure IP […]
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 […]
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