Chapter 43 Content Filtering
ZyWALL Series CLI Reference Guide
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then the Zyxel Device replies to the DNS query with a IP address that points to the block page.
Unlike the Web Content Filter, the DNS Content Filter works if the user is using TLS 1.3 with ESNI.
43.1.2.1 DNS Content Filter Process
1 A user enters a URL into their web browser.
2 The user’s computer sends a DNS query for the URL.
3 The DNS Content Filter detects DNS query, and inspects the website in the DNS query packet.
4 If website contains prohibited material, the DNS reply is redirected to a block page.
43.2 External Web Filtering Service
When you register for and enable the external web filtering service, your Zyxel Device accesses an
external database that has millions of web sites categorized based on content. You can have the Zyxel
Device block, block and/or log access to web sites based on these categories.
See the web configurator User’s Guide to see how to view content filtering reports after you have
activated the category-based content filtering subscription service.
Table 204 content-filter Report Commands
COMMAND DESCRIPTION
content-filter report deactivate
Sets the message to display when content filtering blocks
access to a web page. The
no command clears the setting.
content-filter report server
{ip_address | hostname}
Sets the URL of the web page to which to send users when
their web access is blocked by content filtering. The
no
command clears the setting.
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