26 Static Networking Part 2
Jacob Christensen
Up to this point, we have been using one router in our working environments that use DHCP. However, you will rarely work on a network with only one router because the whole point of an enterprise network is to connect multiple LANs into a single cohesive network.
In this lab, we will create and connect three LANs via three routers. We introduce you to static routing solutions so you can become familiar with routing procedures. Static routing is impractical mainly because it is very manpower intensive to maintain and prone to human error.
Estimated time for completion: 60 minutes
Learning objectives
- Successfully create three functional LANs:
- Gray (DHCP Server)
- Red (Switch + 2 PCs)
- Blue (Switch + 2 PCs)
- Configure three routers to use static routing so all devices can communicate
Prerequisites
Deliverables
4 screenshots are required to receive credit for this lab
- Screenshot of GNS3 workspace with everything labeled
- Screenshot of the DHCP configuration
- Wireshark Screenshots of a Red host successfully pinging:
- Blue Host
- Gray Host
Resources
- MikroTik RouterOS Documentation – IP Routing – https://help.mikrotik.com/docs/display/ROS/IP+Routing
Contributors and Testers
- Dante Rocca, Cybersecurity Student, ERAU-Prescott
Phase I -Building the Topology
The following steps are to create the baseline for completing the lab. It makes assumptions about learner knowledge from completing previous labs. To reduce the amount of stress on the PC, we will be using Linux boxes for DHCP.
By the end of this chapter, your network should look like the following:
- Open GNS3
- Create a new project: LAB_12
- Build a small network with the following specifications:
- Class B Supernet – <IP_ADDRESS>/16
Host Range Host Lower Bound <IP_ADDRESS> Host Upper Bound <IP_ADDRESS> NOTE: Our supernet is the total IP address space we are allowed to use for this network. We will subnet this as necessary to fit our needs for each LAN. If you still confused how subnetting works, there are plenty of online tools that can help augment your learning!
- Subnet – Red
- One switch – Ethernet switch
- Two client machines – VPCS
- Minimize wasted address space for 300 hosts
Network Information Network <IP_ADDRESS> Netmask <IP_ADDRESS> (/23) Broadcast <IP_ADDRESS> Gateway <IP_ADDRESS> DHCP Lower Bound <IP_ADDRESS> DHCP Upper Bound <IP_ADDRESS> NOTE: I am choosing to reserve the first usable host for my gateway addresses. In addition, my DHCP range does not include every single host address available (mostly because I like clean numbers). These are not hard and fast rules. Feel free to adjust as necessary.
- Subnet – Blue
- One switch – Ethernet switch
- Two client machines – VPCS
- Minimize wasted address space for 150 hosts
Network Information Network <IP_ADDRESS> Netmask <IP_ADDRESS> (/24) Broadcast <IP_ADDRESS> Gateway <IP_ADDRESS> DHCP Lower Bound <IP_ADDRESS> DHCP Upper Bound <IP_ADDRESS>
- Subnet – Gray
- One DHCP server – Ubun