Filter
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Filter Policies
7750 SR OS Router Configuration Guide Page 281
Figure 19: Web Redirect Traffic Flow
Starred entries (*) are items the router performs masquerading as the destination, regardless of the
destination IP address or type of service.
Information needed by the filter that may be sent to the portal:
• Customer’s IP address
• Customer’s MAC address
• Original requested URL
•Customer’s SAP
• Customer’s subscriber identification string
Note that the subscriber identification string is available only when used with subscriber
management. Refer to the subscriber management section of the 7750 SR OS Triple Play Guide
and the 7750 SR OS Router Configuration Guide
Since most web sites are accessed using the domain name the router allows either DNS queries or
responds to DNS with the portal’s IP address.
CUSTOMER’S COMPUTER SR/ESS PORTAL WEBSITE ORIGINAL WEBSITE
X>HTTP TCP SYN
X>HTTP TCP SYN ACK*
X>HTTP TCP ACK
HTTP GET
HTTP>X TCP ACK*
HTTP 302 (moved)*
X>HTTP TCP FIN ACK
HTTP>X TCP FIN ACK*
UPDATE POLICY
REDIRECT TO ORIGINAL WEBSITE
NORMAL HTTP WITH ORGINAL WEBSITE
NORMAL HTTP WITH PORTAL