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This will all work if you have the environment configured properly. Cisco L3 is the key along with DHCP server.
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What does configured properly mean. Is this OK or not?
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If I recall properly, you'd still have to do VLAN configurations in the SG200s. They won't just pass along all of the VLANs.
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Why? I kept everything the default vlan 1
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I reread after I typed that. Actually, it sounds like what you want to do should work.
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Generally, your plan should work, but I &nbsp;don't think it is enough...<br />
Phones should be in separate VLAN and have own IP address range (just like WAPs). SG200 are manageable switches and although you hate those you should start use it properly. Network is growing and it is the best time to start to plan for the future, most likely, soon you will have more problems than just IP address is too small.
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Yes, I know. Will do that later.
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Oh yeah, almost forgot about that. It's a Sonicwall firewall though
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Just a thought... Why not just let the Sonicwall handle the work of DHCP and VLANs?
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Sonicwall is going to be decommissioned in a month.
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Makes sense. However, I'd assume the replacement firewall would be capable of the same duties.
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<div class="content wysiwyg-content">
Hey Guys,<br />
<br />
I ran out of IP addresses, it seems our WLAN and Phones are using up a lot of IPs. We have some dummy Cisco SG200 switches in the environment (about 3). Now i got a layer 3 (Cisco 3750x) switch, and I was wondering if this would be sufficient.<br />
<br />
L3 SWITCH (10.1.1.1) --&gt; Firewall 10.1.1.2<br />
Route outside 0 0 10.1.1.2<br />
<br />
-Im just going to use the default VLAN 1 and connect the SG200 (dont want to try and trunk these - i hate those switches..lol)<br />
-The wireless APs i will directly plug into the L3 switch and assign them to VLAN2 (10.1.2.x) <br />
- Use ip helper to my DHCP server on the 10.1.1.x network<br />
<br />
Would this all work?
</div>
</div>


Hey Guys,

I ran out of IP addresses, it seems our WLAN and Phones are using up a lot of IPs. We have some dummy Cisco SG200 switches in the environment (about 3). Now i got a layer 3 (Cisco 3750x) switch, and I was wondering if this would be sufficient.

L3 SWITCH (10.1.1.1) --> Firewall 10.1.1.2
Route outside 0 0 10.1.1.2

-Im just going to use the default VLAN 1 and connect the SG200 (dont want to try and trunk these - i hate those switches..lol)
-The wireless APs i will directly plug into the L3 switch and assign them to VLAN2 (10.1.2.x) 
- Use ip helper to my DHCP server on the 10.1.1.x network

Would this all work?

Layer 3 Switch Configuration

Cisco PIX is a dedicated hardware firewall appliance; the Cisco Adaptive Security Appliance (ASA) is a firewall and anti-malware security appliance that provides unified threat management and protection the PIX does not. Other Cisco devices and systems include routers, switches, storage networking, wireless and the software and hardware for PIX Firewall Manager (PFM), PIX Device Manager (PDM) and Adaptive Security Device Manager (ASDM).

Cisco

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.

Switches / Hubs

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.