Streaming Media Supplement sa2150 and sa2250

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Chapter 8 Configuring Media-IXT for WMT
For details, check a book or web site that discusses regular expressions. At this writing, one such site is:
http://etext.lib.virginia.edu/helpsheets/regex.html
For selective caching and filtering rules for RealNetworks that use url_regex, include the port number. For
example, if you are filtering requests for a clip called clip.wvx at bad.content.com, the correct rule to
use would be this:
url_regex=bad.content.com:1755\/clip.wvx action=deny
Secondary specifiers
Besides the single primary specifier, one or more secondary specifiers may also be added:
• port, meaning port on the origin server. Example:
port=8080
• scheme, meaning the protocol in use. Example:
scheme=rtsp
• prefix, meaning a prefix in the path part of a URL. Example:
prefix=/someclips
• method, meaning a URL request method. Possible values:
get, post, put, trace
• time, meaning a time range. Example:
08:00-14:00
• src_ip, meaning source IP address or IP address range. Examples:
src_ip=1.1.1.1
src_ip=1.1.1.1-255.255.255.255
The allow and deny actions
For filter.config, you must assign one of the two following actions:
action=allow
action=deny
(The other possible actions in filter.config have no effect on Media-IXT.)
The example filter.config rules below deny proxy access to all deniedtome.com sites except for
vetted.deniedtome.com:
dest_host=vetted.deniedtome.com action=allow
dest_domain=deniedtome.com action=deny
Modifying the cache.config file to determine cacheability
To limit streaming media caching to specific URLs, you must specify caching rules in the cache.config
file located in Traffic Server’s config directory.
For cache.config, you must assign one of the two following actions:
action=never-cache
action=standard-cache
(The other possible actions in cache.config have no effect on Media-IXT.)
Caching rules apply to HTTP, RTSP and MMS URLs. You can use the suffix secondary specifier with the
values .rm, .sdp, .asf or other file extensions to limit a rule to those particular file formats. You can also
use the scheme secondary specifier, along with tags where needed, to limit a rule to a particular streaming
format.