Networking IPv4 exercise

Question

I’m starting to learn about networking. It would be really helpful a bit of help with this exercise and some explanations, cause I’m really stuck.

This is the network topology from the exercise:

We know about it:

1. AP1, AP2 and AP3 work as bridges between their wireless and ethernet interfaces (br0)
2. R1 job is the routing of interfaces
3. Private IPv4 addressing is used [192.168.X.X] (only not for F1)
4. Each network must grant Internet access to 450 hosts at least (only not for F1)
5. The “br0” interfaces must be accessible by IP from every device in any of the internal nets

Questions:

1. Which mode (Infrastructure, Ad-hoc, WDS) should the Wifi connections use between AP1-AP2 and which one between AP3-R1? (done)
2. Fill this tables with the IP directions (IpDir/Mask CIDR Format) that would grant Internet access to every device.

IPv4 interfaces directions

Device	Interface	IPv4
PC10	eth0
PC11	eth0
PC12	eth0
M1	wlan0
AP1	br0
AP2	br0
AP3	br0
R1	eth0
R1	wlan0
F1	eth0
F1	fa0	11.17.1.30/30

Routing tables

R1

Destiny	Next jump
_	_
_	_
_	_
_	_

F1

Destiny	Next jump
_	_
_	_
_	_
_	_

AP1

Destiny	Next jump
_	_
_	_
_	_
_	_

AP2

Destiny	Next jump
_	_
_	_
_	_
_	_

AP3

Destiny	Next jump
_	_
_	_
_	_
_	_

Default gateways

Device	Default Gateway
PC10
PC11
PC12
M1
R1
F1
AP1
AP2
AP3

For 2nd question, that's where I have the biggest problem, I'm not sure if I need to create 3 subnets or 4, cause of the wireless router on R1 that gives connection to M1 terminal. I assume that they follow the private directions schema, 192.168.X.X So since we need to give connection to 450 hosts, we can use:

1. 192.168.0.0/24
2. 192.168.64.0/24
3. 192.168.128.0/24
4. 192.168.192.0/24

Is this right?

Answer 1

I want to say sorry because I can't give on the comment section cause of lacking reputation and my grammar is bad.

Number 1 question : It clearly doesn't use Ad-hoc cause it has AP and routers. So your choice is only infra and WDS. I will use WDS on AP1-AP2, and Infrastructure on Ap3-R1

Explanation :

• AD-hoc / peer to peer mode doesn't rely on some infrastructure such as AP or routers. It is formed from groups of wireless users. For example : your PC with your partner's PC. U can exchange any data without any routers or AP.
• Infra mode : Infrastructure mode is a wireless network framework that has a central WLAN access point / router at the heart of the network. In infrastructure mode, wireless devices communicate with each other through an WLAN access point/router. (from https://support.brother.com/g/b/faqend.aspx?c=us&lang=en&prod=ads2500w_us&faqid=faq00002194_000). On the picture, this connection require a centralized AP which is AP3 to connect to the internet. The AP3 is so important cause it is the only way to have Internet connection.
• WDS : U can read it from here. This is the explanation of why I choose WDS. https://www.cisco.com/assets/sol/sb/AP541N_Emulators/AP541N_Emulator_v1.9.2/help_WDS_Bridge.htm

And for question number 2, does we only know about 1 IP which is Internet default gateway (11.17.1.29/30)? So fa0 on F1 will have 11.17.1.30/30. How about internal network IP Block? Do we have to assign it randomly or there are IP blocks that stated on your questions?