Cisco Cisco Web Security Appliance S170 Guía Del Usuario
Chapter 5 Web Proxy Services
About Web Proxy Services
5-2
Cisco IronPort AsyncOS 7.1 for Web User Guide
OL-23207-01
You can configure the Web Proxy as one of the following types:
•
Transparent Proxy. When the appliance is configured as a transparent proxy,
clients are unaware of the Web Proxy. Client applications, such as web
browsers, do not have to be configured to accommodate the appliance. You
might want to configure the appliance as a transparent proxy because it
eliminates the possibility of users reconfiguring their web browsers to bypass
the appliance without knowledge of the administrator. To configure the
appliance as a transparent proxy, you must connect it to an L4 switch or a
WCCP router.
clients are unaware of the Web Proxy. Client applications, such as web
browsers, do not have to be configured to accommodate the appliance. You
might want to configure the appliance as a transparent proxy because it
eliminates the possibility of users reconfiguring their web browsers to bypass
the appliance without knowledge of the administrator. To configure the
appliance as a transparent proxy, you must connect it to an L4 switch or a
WCCP router.
For information about how to configure the appliance when you configure the
proxy in transparent mode, see
proxy in transparent mode, see
•
Explicit Forward Proxy. In an explicit forward proxy configuration, the
appliance acts on behalf of client web browsers to handle requests for servers
on the web. Users must configure their web browsers to point to a single Web
Security appliance. You might want to configure the appliance as an explicit
forward proxy if you do not have an L4 switch or a WCCP router.
appliance acts on behalf of client web browsers to handle requests for servers
on the web. Users must configure their web browsers to point to a single Web
Security appliance. You might want to configure the appliance as an explicit
forward proxy if you do not have an L4 switch or a WCCP router.
You can use the Web Security appliance in a network that includes another proxy
server. For more information about how to deploy and configure the appliance
when the network contains another proxy, see
server. For more information about how to deploy and configure the appliance
when the network contains another proxy, see
.
The Web Proxy handles both HTTP and native FTP transactions. For more
information about working with FTP, see
information about working with FTP, see
Web Proxy Cache
By default, AsyncOS uses a web proxy cache to increase performance for users
accessing the web in some cases.
accessing the web in some cases.
You can edit the web proxy and proxy cache in the following ways:
•
Remove a URL from the cache. Use the
evict
subcommand of the
webcache
CLI command to remove one or more URLs from the cache.
•
Specify a domain or URL to never cache. Use the
ignore
subcommand of
the
webcache
CLI command to specify one or more domains or URLs that the
web proxy should never store in the proxy cache. You can include embedded
regular expression (regex) characters in the URL you specify to never cache.
regular expression (regex) characters in the URL you specify to never cache.