PfSense firewall + L3 Core switch configuration with VLANs
In this lab, we will create 3 vlans and connect our core switch to pfSense firewall with a transit network. Then we will configure our firewall with these vlan subnets. LAN related traffic will not hit the firewall, because SVIs (VLANgateways) will be created on L3 Core switch. All the necessary permissions between vlans will […]
Multiple DHCP Server Configurations For VLANs
On this practice lab, we will configure two DHCP servers for 4 different VLANs. We will create the VLANs on the core switch, then we will assign the DHCP servers to VLANs with the command of “ip helper-address“. By this method, you will be able to use different DHCP servers for different purposes. Cisco Core […]
Cisco ASA Transparent Internal Firewall Configuration
Cisco ASA (Adaptive Security Appliance) is a security device that provides firewall, VPN, and other security services for networks. It can operate in multiple modes, including Routed Mode and Transparent Mode. Let’s focus on Cisco ASA Transparent Mode. In Transparent Mode, the Cisco ASA firewall is inserted into a network without requiring any IP address […]
Fortinet Firewall – Multiple WAN ISP Basic Failover
On our topology, we have Fortigate firewall, Cisco routers and 2 ISP provider with 20.0.0.2 and 10.0.0.2 gateways. We would like to setup a basic failover on Fortigate firewall which will allow us to use 2nd ISP link if ISP-1 drops. Basic idea behind this is “administrative distance” on Static routes on the firewall. We […]
Forgot your Cisco Router Password? Follow these easy steps for recovery on terminal
What is Cisco Rommon Mode? ROM Monitor Mode, often referred to as “ROMMON” mode, is a low-level mode on Cisco networking devices that allows for basic device recovery and maintenance operations. ROMMON stands for “ROM Monitor,” and it provides a way to interact with the device’s firmware and bootstrap loader when normal operating conditions or […]
What is Netflow protocol? Deployment of Netflow server
NetFlow is a network protocol developed by Cisco that is used for network traffic monitoring and analysis. It allows network administrators to collect and view information about the traffic flowing through their network devices, such as routers and switches. A NetFlow server, sometimes referred to as a NetFlow collector or analyzer, is a system or […]
What is RIP Protocol in networking? How implement RIP on routers?
RIP, which stands for Routing Information Protocol, is a distance-vector routing protocol used in computer networking and particularly in Cisco networking equipment. RIP is one of the oldest and simplest routing protocols used to exchange routing information between routers in a network. Cisco routers can be configured to use RIP for routing purposes. Here are […]
What is a DNS Server? How to setup on a network?
A DNS server, or Domain Name System server, is a crucial component of the internet infrastructure that helps translate human-readable domain names into IP addresses. Domain names are the familiar web addresses that people use to access websites, such as “www.barisyuksel.com.tr“. IP addresses, on the other hand, are numeric identifiers that computers and devices use […]
Syslog Server implementation for Cisco network devices
On Cisco networking devices, a syslog server refers to a system or application that collects, stores, and manages log messages generated by the Cisco devices. These log messages contain valuable information about the operation, performance, and events occurring on the network equipment. The syslog server helps network administrators and engineers to monitor, troubleshoot, and analyze […]
What is HSRP protocol? How to implement on the network?
HSRP, or the Hot Standby Router Protocol, is a Cisco proprietary protocol that enables two or more routers to work together in a group to present the illusion of a single virtual router to hosts on a LAN. The main purpose of HSRP is to establish network redundancy and avoid single points of failure, thus […]