How to Configure “GRE over IPSec Tunnel” on Cisco Routers (Site-to-Site)

GRE (Generic Routing Encapsulation) creates tunnels like IPSec; however, it does not encrypt the original packet, so it is not secure. Nevertheless, it has the advantage of being able to encapsulate a wide variety of Layer 3 protocols as well as broadcast and multicast messages. To achieve the flexibility of GRE with the security of […]

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How to Configure GRE VPN Tunnel in Cisco Router (Site-to-Site)

Just like IPSec VPN, which we covered in our last post, GRE VPN uses the internet to connect sites together. GRE, which stands for Generic Routing Encapsulation, creates tunnels like IPSec; however, it does not encrypt the original packet, making it less secure. Nonetheless, it has the advantage of being able to encapsulate a wide

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How to Configure IPSec VPN Tunnel in Cisco Router(Site-to-Site)

Private WAN services such as leased lines and MPLS provide security because each customer’s traffic is separated by using dedicated physical connections (leased lines, for example) or by using MPLS tags. However, when using the internet as a WAN to connect sites together, there is no built-in security by default. To provide secure communications over

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How to Configure Voice VLAN in Cisco Switch in Packet Tracer

Normally, in a LAN, only one cable is used to connect a host to a switch. This cable carries data traffic from the host device to the switch, which forwards the traffic to the destination. However, in today’s office settings, there is typically an IP phone in each office. The IP phone needs to transmit

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How to Configure VTP in Cisco Switch in Packet Tracer

VTP (VLAN Trunking Protocol) is a Cisco proprietary protocol designed to simplify VLAN management in large networks. It allows VLAN configuration on a central server switch, known as the VTP server, which then distributes this information to other switches in the network, called VTP clients. Instead of configuring VLANs manually on each switch in the

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Router on a Stick Configuration

In any network, a VLAN is used to segment the network. Users in a particular VLAN will not have access to resources in other VLANs. For host devices in one VLAN to be able to communicate with hosts on another VLAN, a router will be needed to forward the traffic from one VLAN to another.

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How to Configure Inter VLAN Routing on Cisco Layer 3 Switch

In any network, a VLAN is used to segment the network. Users in a particular VLAN will not have access to resources in other VLANs. Normally, devices in the same VLAN can communicate with each other without the traffic having to traverse the router. However, for packet to flow from a host in one VLAN

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How to Configure LLDP on Cisco Devices

Link Layer Discovery Protocol (LLDP) is an industry-standard protocol (IEEE 802.1AB) implemented by various vendors. Unlike Cisco’s proprietary CDP, LLDP is typically disabled on Cisco devices by default and requires manual enabling. It’s possible for a device to run both CDP and LLDP simultaneously, although usually, only one is utilized. LLDP messages are periodically sent

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How to Configure And Verify CDP in Cisco Devices

CDP is a Cisco proprietary Layer 2 discovery protocol used to share information with and discover information about neighboring devices. The shared information includes hostname, IP address, device type, etc. Because this protocol shares information about devices in the network, it is considered a security risk and is often not used. CDP is enabled on

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How to Configure DHCP Server on Cisco Router in Packet Tracer

Dynamic Host Configuration Protocol (DHCP) is a protocol used to automatically assign IP addresses to end-user devices in a network. Apart from using a dedicated server for DHCP service in a network, a Cisco router can also be used as a DHCP server. It just needs an extra bit of configuration. In this post, I

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