IPv6, VLANs, and Fault-Tolerant Routing Lab

This repository contains a complex, multi-site network topology built in Cisco Packet Tracer. The objective was to build a robust network based on a strict set of technical requirements.

The project's focus is on implementing a pure IPv6 network, segmented with VLANs, and made fully redundant using the RIPng dynamic routing protocol.

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Topology

This is the logical topology of the implemented network, showing all devices, VLANs, and IPv6 address spaces.

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Core Skills & Technologies

This lab demonstrates proficiency in the following key networking areas:

• IPv6 Addressing: The entire network is built on IPv6 (2001:DB8::/64 prefix), including all routers, servers, and client PCs.
• VLAN Segmentation: The access layer is segmented into four distinct VLANs (VLAN 10, 11, 20, 21) to isolate traffic between departments.
• Inter-VLAN Routing: Implemented "Router-on-a-Stick" on routers R1 and R2 to allow communication between the different VLANs.
• Dynamic Routing (RIPng): The RIPng protocol is used to dynamically share routing information between R1 and R2.
• Fault Tolerance (Redundancy): The network was designed to be fault-tolerant. As shown in the topology, there are multiple WAN links. The network remains fully functional and automatically re-routes traffic if one of the primary WAN links fails.
• Default Route Redistribution: The routers are configured to learn a default route (to the "Internet") and redistribute it via RIPng to all client PCs, providing them with external network access.

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Project Objectives & Features

This project was built to meet the following technical goals:

• [✓] VLAN Connectivity: PCs within the same VLAN (e.g., VLAN 10) can communicate.
• [✓] Inter-VLAN Connectivity: PCs in different VLANs on the same switch (e.g., VLAN 10 and VLAN 11) can communicate.
• [✓] Inter-Site Connectivity: PCs on the "left" network (VLAN 10/11) can communicate with PCs on the "right" network (VLAN 20/21) and vice-versa.
• [✓] Server Access: All PCs on all VLANs have full access to the central Server (2001:DB8:ABE:10::/64).
• [✓] Internet Access: All PCs have access to the "Internet" via a redistributed default route.
• [✓] Fault Tolerance: The network correctly handles a link failure and continues to route traffic.

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Key Configuration Examples

Here are some representative snippets of the configuration used in this project.

1. Router-on-a-Stick (Inter-VLAN Routing)

Configuration for a router's sub-interfaces to handle tagged VLAN traffic.

! On Router R1
!
interface GigabitEthernet0/0.10
 encapsulation dot1Q 10
 ipv6 address 2001:DB8:ABCD:10::1/64
!
interface GigabitEthernet0/0.11
 encapsulation dot1Q 11
 ipv6 address 2001:DB8:ABCD:11::1/64
!

2. RIPng (Dynamic IPv6 Routing) Enabling RIPng globally and on specific interfaces.

! Global configuration
!
ipv6 unicast-routing
!
ipv6 router rip MY_RIP_PROCESS
!
! Interface configuration (e.g., on WAN link)
!
interface Serial0/1/0
 ipv6 address 2001:DB8:ABCD:12::1/64
 ipv6 rip MY_RIP_PROCESS enable

3. Default Route Redistribution Injecting a default route into the RIPng process to provide internet access to all devices.

! On the router connected to the "Internet" (R1)
!
! Create a static default route
ipv6 route ::/0 2001:DB8:A:B::1
!
! Redistribute it in the RIPng process
ipv6 router rip MY_RIP_PROCESS
 default-information originate