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SonicWall - how to Setup    Control Port 20021      Data port range 25000-25500

Posted on 2014-11-13
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Last Modified: 2014-11-17
We have a SonicWall TZ 210 and are installing   FTP on a few of our Workstations for our Bank.

Our Bank tech support wants me to open the above Control port and data port range.

I normally run the Public Server Wizard for forwarding outside traffic like Security Cameras or HVAC controls but I think what they want is the Firewall to allow traffic WAN to LAN on the Control port and data port mentioned above.

Am I thinking about this in the right way ?
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Question by:azpete
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Expert Comment

by:Aaron Tomosky
ID: 40442364
Yes use the public server wizard and then just edit the created service groups to have those ports
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Author Comment

by:azpete
ID: 40442465
I should have added more in the question.

We want to open the above control port and data range for the entire LAN. (From Wan)

By default all LAN to WAN traffic and services are "ALLOW" and all WAN to LAN are "DENY"
Is it possible to modify the WAN to LAN to "ALLOW" that control Port and Data RANGE
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by:Aaron Tomosky
ID: 40442500
That will only work if you have 1 to 1 wan to lan up mapping.
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by:azpete
ID: 40442538
Aaron, I understand and have done the 1 to 1 mapping via the Wizard many times for many clients on all models of SonicWalls.
  If the bank  said ,
"hey firewall guy, set up a public SFTP  PC on your LAN"   the public server wiz does that in 20 seconds.  But thats not the case.  We want to setup 5 or so PCs with SFTP software applications, and the bank just repeats the mantra " open your firewalls control port and data range ( to the numbers above)  My assumption may be wrong but shouldnt it be that you can say " Sure..., DENY all WAN to LAN services ( that are not initiated by the LAN" BUT add a rule that says " EXCEPT services for this control port and data range ???
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Expert Comment

by:Aaron Tomosky
ID: 40442558
Yes you can put an allow rule above the deny rule. They get processed in order. However I would strongly suggest this is not a good idea
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Author Comment

by:azpete
ID: 40442654
I agree that the rule would be a big hole but ( besides the 1 to 1)  how would you answer the banks direction to "open the control port  and that data range on the firewall but not to a specific PC ?
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Expert Comment

by:Aaron Tomosky
ID: 40442801
You can't, you can open it on all pcs with 1 to 1 nat.
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Author Comment

by:azpete
ID: 40442860
i dont know what that means        " open it on all pcs with 1 to 1 nat"  can you explain ?
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Expert Comment

by:Aaron Tomosky
ID: 40443015
If you have 1 to 1 nat, then each wan ip maps to a lan ip. So you can add a firewall rule that states for those services from wan to lan, allow it. If that's not what they want then I really don't understand their request.
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Author Comment

by:azpete
ID: 40443124
I agree, either the bank tech support statement is incomplete or misleading or my concept of opening wan to lan ports is too shallow.  I will be in contact with the bank and see if I can get more information. They may simply want a public server but are unwilling to say so directly.  Stand by and I will get more info
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masnrock earned 500 total points
ID: 40444350
Do you block outgoing communication? If not, then you have nothing to do.  Some companies do, in which case it would be applicable to open ports for outbound communication.
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Author Comment

by:azpete
ID: 40444415
By default , SonicWall has a "ALLOW all services from LAN to WAN" rule .  I assume that means that a LAN PC can open communications on ANY port and ANY data range.  Since the bank appears to be saying we are not setting up a public server then I think we will be ok with no changes to the SonicWall.  

I I have sent such a statement to the Banks tech support folks and am looking forward to their reply.

  I suspect that a CISCO PIX or other brands of firewalls default to DENY all services from LAN to WAN and the admin must specifically open the ones they want.
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Expert Comment

by:masnrock
ID: 40444572
Exactly. Some companies also prefer to block everything and only allow what should be necessary for work. You are in the clear.
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