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6.12 Service Protection
A service protection class is a group of settings you specify to protect your service against
malicious attacks, such as Denial of Service (DoS) and Distributed Denial of Service (DDoS).
You can create a service protection class in the Service Protection Catalog, and configure
settings such as the following:
•
Lists of banned and trusted IP addresses. Connections from these IPs are never
allowed and always allowed, respectively.
•
Limits on the number of connections from one machine or a group of machines.
•
A limit on the connection rate from any one IP address.
•
Restrictions on HTTP requests, such as whether they should be strictly RFC2396
compliant.
You can apply a service protection class to a virtual server using the appropriate Virtual
Servers > Edit page.
6.13 Content Caching
Content Caching is performed by an HTTP virtual server. The virtual server stores common
responses in a web cache, and replies to common requests by serving the response directly
from the web cache.
This has the effect of reducing the number of connections that ZXTM forwards to your backend server nodes, this reducing the load on these servers.
Content caching is handled by HTTP virtual servers, and can be accessed via the Virtual
Servers > Edit page.
Content Caching is an optional ZXTM capability. Some versions of ZXTM may not provide this
feature; it can be obtained as an upgrade option if required.
6.14 Content Compression
ZXTM can compress web content before sending it to the remote client. This can reduce your
bandwidth usage, and speed up the delivery of large web pages to clients with slow
connections.
Some web servers are also able to compress content, so it may be more efficient to spread
this work across your web servers instead of using ZXTM. Enabling compression on both
should not cause any problems.
If you offer large files for download from your site, it may be sensible to pre-compress them
rather than have a server do this each time they are requested. ZXTM can be configured to
only compress certain file types; by default, it only compresses HTML and plain text
documents.
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