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Comcast Business GW/Sonic Wall Setup

I am trying to piece together some networking equipment at a site that another it person purchased.  
Comcast GW will handle wifi.  Can anyone give me some pointers on how to set up the Comcast GW into a passthru mode, where it will handle the WIFI, but the Sonic Wall will handle outside VPN.
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tike55
Asked:
tike55
4 Solutions
 
CESNetwork AdministratorCommented:
Do you have a block of static IP addresses?
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Tom CieslikIT EngineerCommented:
If you going to need users access to your local network using WiFi and WiFi will be set before SonicWall (firewall) then it's not possible for 2 reasons

1. You need to establish DHCP on WiFi and if Comcast GW will be set to Bridge mode it's not possible
2. You going to have 2 Firewalls in your company.

If you need to do it, just set your Comcast first with with VLAN and WiFi on separate LAN and set DMZ for SonicWall
You can handle all rules on SonicWall then and setup VPN but people from WiFI will not have access to your LAN, only to Internet.
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masnrockCommented:
Start with the comment from CES.

If you have a block of static addresses, then you can simply configure the Sonicwall with one of the static public addresses, while leaving wireless turn on at the Comcast gateway.

I am assuming that you want to have a guest wireless network. I would recommend running that all behind the Sonicwall, and having VLANs in place (I am also assuming that you want to have a corporate wireless network).
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tike55Author Commented:
I think my stack is: xx.xxx.177.232
                           gw:  xx.xxx.176.1

sound right?  How would I configure the sonic wall to have one of these ips? How would I configure the Comcast GW?
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masnrockCommented:
You would need to simply configure the WAN interface of your Sonicwall with the correct IP, mask, and gateway. When you get static addresses from Comcast, the gateway address is actually the address of your Comcast Business Gateway. No configuration of the gateway is required.
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pgm554Commented:
Usually Comcast will give you a wireless router of some sorts set up to AP mode on the other side of your firewall.

Beware that Comcast may try to make your address an open  public wifi hotspot.

Let them know that's not what you want or need.
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CESNetwork AdministratorCommented:
Ok so we have that info, but Tom Cieslik is correct;  You've got a router behind a router, ergo two segmented networks.  The wifi on the Comcast will not be able to pass to the network behind the SonicWall.  So you will have wifi, but you cannot use it to access your primary LAN (not good for laptops that need company data).

To get wifi on the LAN behind the SW, you'll need a wireless model or another WAP.
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