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Sonicwall TZ100: restrict access to certain device for dropbox.com and synology.com?

Posted on 2014-02-20
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Last Modified: 2014-02-25
Hi,

I'd like to limit access for my nas to update servers from synology and dropbox.com.
Can I do this on domain names or should I enter ip addresses, if addresses where to find a good reference for ranges to use?

Please advise.
J.
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Question by:janhoedt
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by:carlmd
ID: 39876439
Do you mean that you want to block all access to those two URL's from the nas?
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Author Comment

by:janhoedt
ID: 39877369
No, the opposite. Nas should only be able to connect to those urls.
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Expert Comment

by:carlmd
ID: 39879387
Ok, since dropbox has two ip addresses and synology has only one, I would use the ip addresses. On the Sonicwall...

1. Define an address object for the NAS, synology, and two for dropbox. Then combine all but the NAS into a new group like nastargets.

2. Create a firewall rule to permit nothing from the NAS to WAN.

3. Create a new firewall rule to permit all from the NAS to the nastargets (new group). Be sure that this rule appears before the one in 2. that permits nothing.

You should now be able to connect to only those two sites from the NAS.
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Author Comment

by:janhoedt
ID: 39879440
Thanks. But pls specify:

> Ok, since dropbox has two ip addresses >and synology has only one, I would use the >ip addresses. On the Sonicwall...

What ip addresses would that be then? I can hardly imagine Dropbox would have only 2, synology 1 ip address. They use ip ranges not only 1 or 2 ip s. I was looking for those addresses/ranges as I mentioned in my question.
Much better would domain names be as they are flexible (Dropbox or Syn can add remove addresses randomly).
Hiwever not sure if Sonicwall supports that. That s my q. Configuring is not big a deal.
Note: you cannot change priority of rule in tz100, not that I m aware of or can see in the gui.
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carlmd earned 500 total points
ID: 39882137
I did an nslookup on dropbox.com and synology.com and got the following.

# nslookup dropbox.com
Server:  name
Address:  192.168.1.71

Non-authoritative answer:
Name:    dropbox.com
Addresses:  108.160.166.62, 108.160.165.62

# nslookup synology.com
Server:  name
Address:  192.168.1.71

Non-authoritative answer:
Name:    synology.com
Address:  59.124.41.242

Yes you can use the url if you want, to create the address object. See the following.

https://www.fuzeqna.com/sonicwallkb/ext/kbdetail.aspx?kbid=7486

See the following to set rule priority.

https://www.fuzeqna.com/sonicwallkb/ext/kbdetail.aspx?kbid=3716
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Author Comment

by:janhoedt
ID: 39883435
Nslookup gives dns names not ip addresses which are used by a company.
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Expert Comment

by:carlmd
ID: 39883491
nslookup provides both an ip and a name (domain) which is typically what you typed. It queries a DNS domain nameserver to lookup and find IP address information of computers in the internet. Convert a host or domain name into an IP address.

See prior post. Also as indicated you can use the url if desired.
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Author Comment

by:janhoedt
ID: 39883739
Can I user wildcards? *.synology.com doesn't seem to work.
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Expert Comment

by:carlmd
ID: 39883850
No, create each unique url as a separate address object and then put them in a group.
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Author Comment

by:janhoedt
ID: 39884039
Ok, but I have no clue about the url s. So then I better use the ip s you mentioned. However, I still don t get how synology and Dropbox only consist of 1/2 ip s. There are many servers behind it, why/how only 1 ip?
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Expert Comment

by:carlmd
ID: 39885310
EXACTLY what do you type/use (URL?) to access these two sites, and how are you doing it? For example a program or app from your NAS?
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Author Comment

by:janhoedt
ID: 39886645
I just want my nas (Synology) to be able to access Synology update servers, then I want the dropbox app on my Synology to be able to connect to Dropbox. I'm doing nothing myself, the Synology needs only to have appropriate access.
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Author Comment

by:janhoedt
ID: 39886647
How? I limit every access from lan to wan and only enable certain acccesses: f.e. synology http/https to ip or url.
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Author Comment

by:janhoedt
ID: 39886652
Note: the lan to wan any is deny, priority is on 12. Not sure what figure to fill in there, think it's the lowest possible?
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Expert Comment

by:carlmd
ID: 39886667
You can use either the ip's or url if you know exactly what they are.

The lan to wan deny for the NAS priority does not matter, as long as the permit rule is above it.
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