Alteon Application Switch Operating System Application Guide
Application Redirection
468 Document ID: RDWR-ALOS-V2900_AG1302
Network Address Translation Options
URL-based cache redirection supports three types of Network Address Translation (NAT):
• No NAT—Traffic is redirected to the cache with the destination MAC address of the virtual
server replaced by the MAC address of the cache. The destination IP address remains
unchanged, and no modifications are made to the IP address or the MAC address of the source
or origin server. This works well for transparent cache servers, which process traffic destined to
their MAC address but use the IP address of some other device.
• Half NAT—In this most commonly used NAT method, the destination IP address is replaced by
the IP address of the cache, and the destination MAC address is replaced by the MAC address of
the cache. Both the IP address and the MAC address of the source remain unchanged.
• Full NAT—The source IP address and the source MAC address are replaced by the IP address
and MAC address of the cache. This method works well for proxy cache servers.
Configuring URL-Based Cache Redirection
This procedure is an example configuration for URL-based cache redirection.
To configure URL-based cache redirection
1. Before you can configure URL-based cache redirection, configure Alteon for basic SLB with the
following tasks:
— Assign an IP address to each of the real servers in the server pool.
— Define an IP interface.
— Define each real server.
For information on how to configure your network for SLB, see Server Load Balancing, page 165
.
2. Configure Alteon to support basic cache redirection.
For information on cache redirection, refer to Application Redirection, page 455
.
3. Configure the parameters and file extensions that bypass cache redirection.
a. Add or remove string IDs that should not be cacheable.
b. Enable or disable ALLOW for non-GETS (such as HEAD, POST, and PUT) to the origin server:
• ena—Alteon allows all non-GET requests to the origin server.
• dis—Alteon compares all requests against the expression table to determine whether
the request should be redirected to a cache server or the origin server.
c. Enable or disable cache redirection of requests that contain the string “cookie:” in the HTTP
header:
• ena—Alteon redirects all requests that contain "cookie:" in the HTTP header to the
origin server.
• dis—Alteon compares the URL against the expression table to determine whether the
request should be redirected to a cache server or the origin server.
>> # /cfg/slb/filt 1/adv/layer7/addstr|remstr <ID>
>> # /cfg/slb/layer7/slb/addstr|remstr <strings>
>> # /cfg/slb/layer7/redir/urlal {ena|dis}
>> # /cfg/slb/layer7/redir/cookie {ena|dis}
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