VLAN -- what's the deal?

I have two pcs in different networks connected to a router via switch.

192.168.100.1 255.255.255.0
192.168.200.1 255.255.255.0

Both are in the same VLAN (vlan1)

They are communicating just fine. What's the deal with VLAN? Why do we need them? If I put on the VLAN it'll be more configurations (trunking).

Find more posts tagged with

Free for TechExams community: Cybersecurity salary guide

Compare cert salaries and plan your next career move

Button

Comments

Heero

Separation of broadcast domains is a big reason. Security as well. You can run different networks over the same layer 2 infrastructure using the same vlan. It is just not ideal. I have done this a few times, but in every scenario it has been more of a hack.

HackedAlias

Separation of broadcast domains, separation of various traffic (data, voice, wireless etc). Increased security and logical separation of various hosts/devices for easier network management.

docrice

Because anyone in the first network can re-IP their machine and all of a sudden they're in the second network. It's built-in "VLAN-hopping" capability. All ARP broadcasts are seen by everyone, even if it wasn't intended for their network. Security nightmare.

Ltat42a

We had separate VLANs set up at work that would allow "Guests" wireless access to the internet, yet they couldn't access our intranet.

drkat

I guess the real question is: Why wouldn't you use a vlan? - this is just a sloppy design besides what are you using as your default gateways and how is your router set up? i'd be interested to see...

NetworkVeteran

drkat wrote: »

I guess the real question is: Why wouldn't you use a vlan? - this is just a sloppy design

In my home network, every device is in its own VLAN--my PC, my printer, my cell phone, even my Internet router! It's mad secure!

drkat

NetworkVeteran wrote: »

In my home network, every device is in its own VLAN--my PC, my printer, my cell phone, even my Internet router! It's mad secure!

heh... ocd

MrBishop

NetworkVeteran wrote: »

In my home network, every device is in its own VLAN--my PC, my printer, my cell phone, even my Internet router! It's mad secure!

LOL, now that is too funny! WTF