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Simulating Dynamic Routing Networks with Cisco Packet Tracer

Simulating Dynamic Routing Networks with Cisco Packet Tracer
June 23, 2024

Simulasi Routing Dinamis dengan Cisco Packet Tracer

Overview

Building a physical network lab with real routers and switches is expensive and time-consuming. Getting that same network to run perfectly in a virtual environment — with zero packet loss and full inter-subnet connectivity — is where the real networking begins. Cisco Packet Tracer bridges this gap — it's a lightweight network simulator designed for students and network engineers. In the Dynamic & Static Routing project, we designed two real-world network scenarios (internet café and office network) on Cisco Packet Tracer and configured dynamic routing protocols for real-time packet forwarding between subnets. This article covers the complete network simulation pipeline: from topology design and IP addressing to routing configuration and connectivity testing.

The Network Simulation Pipeline

┌──────────────┐     ┌──────────────┐     ┌──────────────┐
│   Topology   │     │   Routing    │     │   Testing    │
│   Design     │     │   Config     │     │              │
│              │     │              │     │              │
│ IP Addressing│────▶│ RIP / OSPF / │────▶│ ping &       │
│ Subnetting   │     │ EIGRP        │     │ tracert      │
│              │     │              │     │              │
│ Topology     │     │ Router &     │     │ 0% Packet    │
│ Design       │     │ Switch Setup │     │ Loss         │
└──────────────┘     └──────────────┘     └──────────────┘

Step 1: Topology Design

Before any configuration, the first step is designing the network topology and IP addressing scheme for each scenario.

Scenario 1 — Office Network

The office network consists of three departments, each isolated in their own subnet and interconnected via routers: 
Subnet HR     : 192.168.1.0/24
Subnet IT     : 192.168.2.0/24
Subnet Finance: 192.168.3.0/24

Router0 ──────── Switch0 ──────── PC-HR
   │
Router1 ──────── Switch1 ──────── PC-IT
   │
Router2 ──────── Switch2 ──────── PC-Finance

Scenario 2 — Internet Café Network

The internet café network connects multiple client PCs to a central router that acts as a gateway to the internet: 
Subnet Client : 192.168.10.0/24
Gateway/ISP   : 192.168.20.0/24

Router ──────── Switch ──────── PC-Client-1
                        ├───── PC-Client-2
                        ├───── PC-Client-3
                        └───── PC-Client-N

Step 2: Routing Protocol Configuration

RIP v2 (Routing Information Protocol)

RIP is the simplest dynamic routing protocol, suitable for small networks with a maximum of 15 hops:
Bash
# Configure RIP on Router0
Router> enable
Router# configure terminal
Router(config)# router rip
Router(config-router)# version 2
Router(config-router)# network 192.168.1.0
Router(config-router)# network 192.168.2.0
Router(config-router)# no auto-summary
Router(config-router)# end

OSPF (Open Shortest Path First)

OSPF uses the Dijkstra algorithm to find the shortest path, making it more efficient for larger networks:
Bash
# Configure OSPF on Router0
Router> enable
Router# configure terminal
Router(config)# router ospf 1
Router(config-router)# network 192.168.1.0 0.0.0.255 area 0
Router(config-router)# network 192.168.2.0 0.0.0.255 area 0
Router(config-router)# end

EIGRP (Enhanced Interior Gateway Routing Protocol)

EIGRP is a Cisco proprietary protocol that offers the fastest convergence using the DUAL algorithm:
Bash
# Configure EIGRP on Router0
Router> enable
Router# configure terminal
Router(config)# router eigrp 100
Router(config-router)# network 192.168.1.0
Router(config-router)# network 192.168.2.0
Router(config-router)# no auto-summary
Router(config-router)# end

Routing Protocol Comparison

| Protocol | Algorithm | Max Hop | Convergence | Best For | |----------|-----------|---------|-------------|----------| | RIP v2 | Bellman-Ford | 15 | Slow | Small networks | | OSPF | Dijkstra | Unlimited | Fast | Large networks | | EIGRP | DUAL | Unlimited | Very fast | Cisco networks |

Step 3: Cable Type Selection

Choosing the correct cable type is critical for ensuring proper connectivity between devices.

Straight-Through Cable

Used for connecting different types of devices: 
PC       ──[Straight-Through]──▶ Switch
Switch   ──[Straight-Through]──▶ Router

Crossover Cable

Used for connecting similar types of devices: 
Router   ──[Crossover]──▶ Router
PC       ──[Crossover]──▶ PC
Switch   ──[Crossover]──▶ Switch

Cable Type Comparison

| Cable Type | Used For | Example | |------------|----------|---------| | Straight-through | Different devices | PC ↔ Switch, Switch ↔ Router | | Crossover | Same device type | Router ↔ Router, PC ↔ PC |

Step 4: Connectivity Testing

Ping Between Subnets

Bash
# From PC-HR to PC-Finance (Office Network)
PC> ping 192.168.3.10

Pinging 192.168.3.10 with 32 bytes of data:
Reply from 192.168.3.10: bytes=32 time=1ms TTL=126
Reply from 192.168.3.10: bytes=32 time=1ms TTL=126
Reply from 192.168.3.10: bytes=32 time=1ms TTL=126
Reply from 192.168.3.10: bytes=32 time=1ms TTL=126

Ping statistics for 192.168.3.10:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss)

Tracert to Observe Routing Path

Bash
# Tracert from Warnet Client PC to Gateway
PC> tracert 192.168.20.1

Tracing route to 192.168.20.1 over a maximum of 30 hops:
  1    1ms    192.168.10.1   (Local Gateway)
  2    2ms    192.168.20.1   (ISP/Internet)

Trace complete.

Optimization Tips for Network Simulation

1. Use OSPF for Scalable Networks

Unlike RIP, OSPF has no hop count limit and converges faster. For large office networks with multiple departments, OSPF with multiple areas is the recommended approach:
Bash
# OSPF with multiple areas for large networks
Router(config)# router ospf 1
Router(config-router)# network 10.0.0.0 0.0.0.255 area 0       # Backbone
Router(config-router)# network 192.168.1.0 0.0.0.255 area 1    # HR Area
Router(config-router)# network 192.168.2.0 0.0.0.255 area 2    # IT Area

2. Add DHCP Server

Instead of manually assigning IPs to every client PC, configure a DHCP server on the router to automate IP distribution:
Bash
Router(config)# ip dhcp pool WARNET
Router(dhcp-config)# network 192.168.10.0 255.255.255.0
Router(dhcp-config)# default-router 192.168.10.1
Router(dhcp-config)# dns-server 8.8.8.8
Router(dhcp-config)# end

3. Implement VLAN for Traffic Segmentation

Separate inter-department traffic in the office network using VLANs to improve security and reduce broadcast traffic:
Bash
Switch(config)# vlan 10
Switch(config-vlan)# name HR
Switch(config)# vlan 20
Switch(config-vlan)# name IT
Switch(config)# vlan 30
Switch(config-vlan)# name Finance

Conclusion

The journey from a blank topology to a fully connected multi-subnet network requires careful planning at every stage. Cisco Packet Tracer's simulation environment makes it possible to practice enterprise-grade networking on any laptop without physical hardware. The key lesson from this project: protocol selection is everything. A wrong routing protocol choice that works on a 3-router lab will completely break on a 30-router production network. RIP is a great starting point, but OSPF and EIGRP are what real networks run on.
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