Multiple VLANs sharing one Internet Connection

Posted on 2007-10-11
Last Modified: 2008-01-09
I have a Dell PowerConnect 6248 and would like to set up 3 different VLANs that can talk to eachother as well as share a SonicWall Pro 1260 Firewall.

I want set up the 3 different VLANS like this

VLAN1 - has department 1 computers using 10 ports
VLAN2 - has department 2 computers using 15 ports
VLAN3 - has department 3 computers using 5 ports

VLAN1 interface is
VLAN2 interface is
VLAN3 interface is

I would like VLAN 1 and VLAN2 to communicate with each other while neither communicating with  VLAN3

All 3 VLANS should be able to get to the internet using the Sonicwall. Is this possible?

Question by:jcourtney
    LVL 5

    Accepted Solution

    This shoul be easy enough - it seems to be a lyer 3 device so you can just turn on ip routing and assign each vlan an ip address - then they should route between them
    put the sonic wall on one of the vlans and set the DFG on the switch to be the sonicwall - that should allow all vlans to talk to each other and all vlans to send traffic out via the sonicwall
    to stop vlan 3 talking to vlans 1&2 you will need some sort of access control list to stop and talking to and an opposite list to stop 1&2 talking to 3
    I have done setups like this a few times - but only ever on Cisco kit - I cant believe its much different on the dell stuff though - proabably just different commands

    Author Comment

    I think im close. I set up the vlans and they do communicate with eachother. I have not set up acls to prevent vlan3 communication yet. The only problem know is that the internet doesnt seem to work. The sonic wall is doing nat translation. is there something i need to configure there?
    LVL 5

    Expert Comment

    you need to setup the switch with a default gateway so that it sends all traffic to the sonicwall for routing out to the net
    ip route x.x.x.x - where x.x.x.x is the sonicwall ip
    all client PC's should use the switch IP as there defualt gateway - the switch will then forward the traffic on out to the net - the sonicwalll should be setup to do hide nat (all internal behind one external) then if u set it up right it should work
    if not can you do an ipconfig from a client and provide some addresses from the sonicwall and switch ?

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