TMS zl Management and Configuration Guide ST.1.2.100916

4-96
Firewall
Application-Level Gateways (ALGs)
■ removes the session information when it receives a Call-Clear-Request or
Call-Disconnect-Notify message.
rtsp
RTSP controls a stream that might be sent over a separate protocol. For
example, RTSP control may occur on a TCP connection while the data flows
via UDP. In this protocol, the client initiates a connection to the server on
TCP 554. Both the client and server exchange the series of request and
responses. The RTSP client and server mutually negotiate the transport
parameters (such as lower transport, unicast or multicast, source, destination,
port, and so on) through the SETUP request and response.
The SETUP request contains a transport header that may contain a number of
transports that are acceptable to the client for data transmission.
The RTSP ALG
■ reads SETUP requests in the control-connection payloads and checks for
the following strings in the payload:
• client_port
• server_port
■ opens data associations to permit audio and/or video data transfers
through the firewall according to the information in the above strings.
■ translates port information according to NAT policies.
Note If you are having trouble with this application, make sure that you have
permitted the DNS service (
UDP 53) and the HTTP service (TCP 80) for end-
points that use RTSP.
sql
This ALG:
■ supports Oracle 8i (using SQL*Net middleware)
■ interprets and translates the redirect messages coming from the network
listener.
This message contains the IP address and the listen port of the SQL server
that the client needs to contact for data transfer.
■ translates the IP address and port information according to NAT policies.