SonicWALL TZ 180 Bedienungsanleitung PDF herunterladen (Seite 217)

Network > Address Objects

217

SonicOS Enhanced 4.0 Administrator Guide

Blocking All Protocol Access to a Domain using FQDN DAOs

There might be instances where you wish to block all protocol access to a particular destination

IP because of non-standard ports of operations, unknown protocol use, or intentional traffic

obscuration through encryption, tunneling, or both. An example would be a user who has set

up an HTTPS proxy server (or other method of port-forwarding/tunneling on “trusted” ports like

53, 80, 443, as well as nonstandard ports, like 5734, 23221, and 63466) on his DSL or cable

modem home network for the purpose of obscuring his traffic by tunneling it through his home

network. The lack of port predictability is usually further complicated by the dynamic addressing

of these networks, making the IP address equally unpredictable.

Since these scenarios generally employ dynamic DNS (DDNS) registrations for the purpose of

allowing users to locate the home network, FQDN AOs can be put to aggressive use to block

access to all hosts within a DDNS registrar.

Note A DDNS target is used in this example for illustration. Non-DDNS target domains can be

used just as well.

Assumptions

• The SonicWALL firewall is configured to use DNS server 10.50.165.3, 10.50.128.53

• The SonicWALL is providing DHCP leases to all firewalled users. All hosts on the network

use the configured DNS servers above for resolution.

–

DNS communications to unsanctioned DNS servers can optionally be blocked with

Access Rules, as described in the ‘Enforcing the use of sanctioned servers on the

network’ section.

• The DSL home user is registering the hostname moosifer.dyndns.org with the DDNS

provider DynDNS. For this session, the ISP assigned the DSL connection the address

71.35.249.153.

–

A wildcard FQDN AO is used for illustration because other hostnames could easily be

registered for the same IP address. Entries for other DDNS providers could also be

added, as needed.

Step 1 – Create the FQDN Address Object

• From Network > Address Objects, select Add and create the following Address Object:

• When first created, this entry will resolve only to the address for dyndns.org, e.g.

63.208.196.110.

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