Question

SonicWall IP Spoof Error

Asked by: Victor_Torres

I just installed Sonicwall NSA 4500.  I was able to get our LAN connection to access the firewall.  My problem is with LAN that are on a diffirent subnet, Sonicwall detect it as an intruision. I then get an arror of IP spoof dropped.  

   My question is how do I allow another subnet to access the firewall.

Thanks

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Asked On
2009-09-22 at 03:37:28ID24750993
Tags

Firewall

,

Sonic Wall

Topics

Anti-Spam Email Software

,

Networking Hardware Firewalls

Participating Experts
3
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500
Comments
6

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Answers

 

by: nappy_dPosted on 2009-09-22 at 05:57:02ID: 25392231

You cannot unless the firewall has a LAN interface that is connected to that subnet.

 

by: grimkinPosted on 2009-09-22 at 07:51:17ID: 25393462

Basically if packets arrive at an interface which do not come from its local subnet then it will drop them unless that particular subnet is added to the anti-spoofing settings so that it knows to accept those packets.

E.g.  if your LAN interface is 10.1.1.1/24 and you have a subnet 172.16.16.0/24 joined to the LAN by another router then you need to enter 172.16.16.0/24 into the antispoofing config for your LAN interface.

From the docs:

 In a standard setup, the SonicWall will only recognize the subnet of its LAN IP address as being valid. If there are additional subnets connected to the LAN, they must be configured by creating a route to them on the Network > Routing page in SonicOS Enhanced or Standard firmware or the Advanced/Routes page in older appliances running Firmware 6.x.

Do not use the Network > Intranet (SonicOS Standard) or Advanced/Intranet (Firmware 6.x) page to configure the SonicWall for additional LAN subnets. The address ranges defined in these pages impacts only the use of the LAN interface in transparent (standard) mode.

Hope this helps

 

by: Victor_TorresPosted on 2009-09-22 at 08:57:57ID: 25394286

Thanks for the replies,
Hi Grimkin;
          I read that article but I don't really know where to input the additional subnet.  I tried going to Network > routeing > add new policy but I could not get it to work.

 

by: dosdet2Posted on 2009-09-23 at 08:04:56ID: 25403963

Hi Victor_Torres,
I will make a guess based on my sonicwall configuration (I have a different model - but using enhanced OS).
I would try to go into  Network, Interfaces and select the interface that is connected to the "spoofing" subnet and assign an IP address within the "spoofed" subnet along with the mask.  It should have an option to assign the port to the LAN (vs Wan & Opt).
It these options are available & set, I think the spoofing errors go away.
If you have a trunked connection coming into the sonicwall with vlans, then this won't work.

 

by: Victor_TorresPosted on 2009-09-27 at 17:31:39ID: 31631813

This solution was partially correct.  

 

by: grimkinPosted on 2009-09-28 at 02:41:49ID: 25437824

Hi there,

Author Comments:
This solution was partially correct.

Could you let us know the full solution please?

thanks
G

20120131-EE-VQP-002

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