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Allow WLAN access to VPN connection on SonicWall TZ100

Posted on 2011-02-18
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Last Modified: 2012-12-02
I am trying to get a WLAN to communicate with a network that is on the other end of a VPN. I am using a Sonicwall tz100 and have created a VPN between our corporate site and this site using a Site to Site VPN. When I am on the Local LAN I can see the coporate network but when I switch to a wireless connection I cannot see the coporate site. How can I get the wireless LAN to see the corporate site.
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Question by:tparus
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by:hitsotntd
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I am a custom to building L2L VPNs with Cisco equipment so I apologize for not being exact. You will need to make sure that you are allowing the IP range that the WLAN is giving out thru the VPN tunnel.

1. Are you getting your WLAN connection by using a wireless router of some kind? i.e. Linksys?
2. Can you get to the internet via the WLAN?
3. Can you ping your gateway while using the WLAN?
4. Can you ping anything on the Local network via the WLAN?
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by:kdearing
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I'll bet your WLAN is on a different subnet.
You will need to modify the sonicwall rules to allow traffic between the WLAN and VPN subnets.
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caskrist earned 250 total points
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In your vpn setup you must specify which networks (local and remote) can be used in this vpn tunnel, Tab 'networks' be sure to change it on both sides of the vpn tunnel. And  indeed the firewall rules.
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by:digitap
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caskrist is correct.  currently, your vpn tunnel is specifying the LAN subnets are the only IP networks allowed over the VPN.  you need to add the WLAN subnet as an allowed subnet at both ends.  what this means is you'll need to create an address group and add both subnets then use the address group in the local subnets within the vpn settings.  you'll do this at the other end. is the other end a sonicwall?
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by:tparus
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OK, I did that however I cannot talk to the networks by name. I have added all the machines to the Hosts and LMhosts file on the client end yet cannot talk to the network by name. Does Vista use the Hosts and LMHOSTS file to resolve names? On the VPN connection, Advanced tab, I have 'Enable Windows Networking (NetBIOS) Broadcast' checked on both sides yet no communication. I can connect via IP but would like to connect via name.
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by:digitap
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ah, you can modify the DHCP scope on the WLAN to give your LAN DNS server as the DNS server for your WLAN hosts.  this is what i do, especially when i trust my WLAN hosts.  if i don't trust them, then they aren't getting the LAN anyway so i give them a public DNS server like, 4.2.2.2.

does that sound right?
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by:hitsotntd
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I agree with digitap, the issue now is an DNS issue. As long as you can ping the other side of the tunnel successfully by ip address and not by name, that is an dns issue. To repeat what digitap stated, you will need to configure you WLAN access point/router to give out your LAN's DNS server's IP addresses.

FYI, Side note: When editing VIsta's host file, make sure to do it with with admin rights. example,

1.Open Notepad with Administrative privileges by clicking Start, All Programs, Accessories, and then right-click Notepad and select to open as Administrator.
2.Now that Notepad is open with Administrative privileges browse to (C:\Windows\System32\drivers\etc) in Notepad and open the hosts file.

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by:caskrist
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You can also add a WINS server to the DHCP-scope for WLAN.
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by:tparus
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Thanks for all your help on this.
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by:digitap
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you're welcome, thanks for the points!
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by:caskrist
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Thanks, good luck.
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