We help IT Professionals succeed at work.

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

289 Views
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 ?
Comment
Watch Question

Aaron TomoskyDirector, SD-WAN Solutions
CERTIFIED EXPERT

Commented:
Yes use the public server wizard and then just edit the created service groups to have those ports

Author

Commented:
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
Aaron TomoskyDirector, SD-WAN Solutions
CERTIFIED EXPERT

Commented:
That will only work if you have 1 to 1 wan to lan up mapping.

Author

Commented:
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 ???
Aaron TomoskyDirector, SD-WAN Solutions
CERTIFIED EXPERT

Commented:
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

Author

Commented:
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 ?
Aaron TomoskyDirector, SD-WAN Solutions
CERTIFIED EXPERT

Commented:
You can't, you can open it on all pcs with 1 to 1 nat.

Author

Commented:
i dont know what that means        " open it on all pcs with 1 to 1 nat"  can you explain ?
Aaron TomoskyDirector, SD-WAN Solutions
CERTIFIED EXPERT

Commented:
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.

Author

Commented:
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
CERTIFIED EXPERT
Distinguished Expert 2019
Commented:
This one is on us!
(Get your first solution completely free - no credit card required)
UNLOCK SOLUTION

Author

Commented:
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.
CERTIFIED EXPERT
Distinguished Expert 2019

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

Gain unlimited access to on-demand training courses with an Experts Exchange subscription.

Get Access
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Empower Your Career
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE

Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Unlock the solution to this question.
Join our community and discover your potential

Experts Exchange is the only place where you can interact directly with leading experts in the technology field. Become a member today and access the collective knowledge of thousands of technology experts.

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

OR

Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.