sonic wall vpn client on my laptop can connect from home on LAN but not on my wireless network.

Posted on 2006-07-12
Last Modified: 2010-04-11
Connects no problems when plugged into my router but if i am connected to same router by wireless it will not connect.

Question by:tkthelpdesk
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LVL 18

Expert Comment

ID: 17116102
are you local to the firewall? what is the topology?
is the vpn client tied to an interface?
what happens if you try to run a trace route to the tagert vpn concentrator, does it try to go out the wired or the wireless conections?
what IP space are you given when you are wired vs. wireless?

Author Comment

ID: 17119150
are you local to the firewall? No i tried at my house on my home wirless network and at a coworkers house at her wireless net work

what is the topology? Just a flat network 1 static IP into the sonicwall from Comcast and NAT on the inside

is the vpn client tied to an interface? Sonic wall client

what happens if you try to run a trace route to the tagert vpn concentrator, does it try to go out the wired or the wireless conections? Not sure i foolow you but since i am not at the office I think this question is mute?

what IP space are you given when you are wired vs. wireless? Well if i connect from home on the lan then i get the sme IP scheme as the office  10.1.1..... but since i can never make the wireless connection i do not know what it woud give me?

LVL 18

Accepted Solution

PowerIT earned 50 total points
ID: 17123235
I have seen this happen to a Sonicwall VPN client when the MTU is to low. The initial negotiation then fails because the firewall can't handle the fragmentation.
Happened to me after a firmware upgrade of the firewall.
Anyway, try to increase the MTU of your WLAN card.
In XP: open regedit and go to the key:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{Select Interface Nummer}]
The interface number can easily be found by looking at all of them till you find the one with the matching IP-address.
The IP-adress itself can be found by running ipconfig in a command window and looking for you WLAN-card.
When you have found the correct interface number, add a DWORD value named MTU and give it the value '5aa' in hex or 1450 in decimal.
If the MTU value already exist, just change to the above value.
Then reboot.
Let me know if this helped you.


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