Cisco ISDN GW 3241 Bedienungsanleitung PDF herunterladen (Seite 68)

Using firewalls

Figure 19: The video firewall solution

The unit (MCU or IP VCR) does not behave as a router, bridge, or switch; no packets can ever pass

between the unit’s two network ports (Port A and Port B). Routing between ports is permanently disabled.

The system does not forward packets between ports. All control and media connections are bound to

specific physical ports.

Media is not forwarded from one port to the other. In the case of conference participants, the media from

each participant is terminated at the port, and used to create the conference video. The conference video is

then encoded for each participant and sent out from the appropriate port. The exception is the IP VCR

making a point-to-point recording in which one endpoint is reached through port A and the other is

reached through port B. In this case media packets are forwarded between the two ports. Even in this case

no network packets are forwarded, just the media.

The following services can be disabled on Ports A and B:

 HTTP

 H.323 (incoming)

 Streaming (Windows Media Player)

 Streaming (other)

 FTP

Typically, in a video firewall configuration, you configure the default gateway preference for the unit as the

port connected to the Internet (Port B). You must create static routes to the other interface (that is, Port A:

the local network). This is described below.

Company LAN

Port A

Port B

endpoint

MCU/ IP VCR

Internet

endpoint

Router

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Cisco ISDN GW 3241 Bedienungsanleitung Seite 68