How many RTSP modes are support by SRX?

This article introduces the RTSP modes supported by SRX.

There are three modes in RTSP:

Control channel uses TCP, media channel uses UDP.
Control and media channel use same TCP channel(interleave mode).
Control and media channel use different TCP channel.

Currently, ALG RTSP supports mode 1 and mode 2 (in 11.2 need extra configuration).
SRX does not support mode 3 yet. If customer is really using mode 3, then it should be new a requirement for ALG.

Sample packet capture for mode3:

No.     Time        Source                Destination           Protocol Length Fin        Info
1285    45.731724   192.168.1.200         172.16.0.100          RTSP     174    Not set    SETUP rtsp://172.16.0.100/live.006 RTSP/1.0

Frame 1285: 174 bytes on wire (1392 bits), 174 bytes captured (1392 bits)
Ethernet II, Src: Dell_57:4c:34 (5c:26:0a:57:4c:34), Dst: All-HSRP-routers_01 (00:00:0c:07:ac:01)
Internet Protocol Version 4, Src: 192.168.1.200 (192.168.1.200), Dst: 172.16.0.100 (172.16.0.100)
Transmission Control Protocol, Src Port: 51255 (51255), Dst Port: rtsp (554), Seq: 135, Ack: 197, Len: 120
Real Time Streaming Protocol
    Request: SETUP rtsp://172.16.0.100/live.006 RTSP/1.0\r\n
    CSeq: 2\r\n
    Transport: RTP/AVP/TCP;unicast
    Authorization: 0731457378-01-20\r\n
    \r\n
Real Time Streaming Protocol
    Data (1 bytes)

No.     Time        Source                Destination           Protocol Length Fin        Info
1286    45.734743   172.16.0.100          192.168.1.200         RTSP     170    Not set    Reply: RTSP/1.0 200 OK[Unreassembled Packet] 

Frame 1286: 170 bytes on wire (1360 bits), 170 bytes captured (1360 bits)
Ethernet II, Src: Cisco_3b:09:00 (00:1b:53:3b:09:00), Dst: Dell_57:4c:34 (5c:26:0a:57:4c:34)
Internet Protocol Version 4, Src: 172.16.0.100 (172.16.0.100), Dst: 192.168.1.200 (192.168.1.200)
Transmission Control Protocol, Src Port: rtsp (554), Dst Port: 51255 (51255), Seq: 197, Ack: 255, Len: 116
Real Time Streaming Protocol
    Response: RTSP/1.0 200 OK\r\n
    CSeq: 2\r\n
    Date: 07/04/13 10:06:31\r\n
    Session: 12407
    Transport: RTP/AVP/TCP;unicast;server_port=556
[Unreassembled Packet: RTSP]

No. Time Source Destination Protocol Length Fin Info

1285 45.731724 192.168.1.200 172.16.0.100 RTSP 174 Not set SETUP rtsp://172.16.0.100/live.006 RTSP/1.0

Frame 1285: 174 bytes on wire (1392 bits), 174 bytes captured (1392 bits)

Ethernet II, Src: Dell_57:4c:34 (5c:26:0a:57:4c:34), Dst: All-HSRP-routers_01 (00:00:0c:07:ac:01)

Internet Protocol Version 4, Src: 192.168.1.200 (192.168.1.200), Dst: 172.16.0.100 (172.16.0.100)

Transmission Control Protocol, Src Port: 51255 (51255), Dst Port: rtsp (554), Seq: 135, Ack: 197, Len: 120

Real Time Streaming Protocol

Request: SETUP rtsp://172.16.0.100/live.006 RTSP/1.0\r\n

CSeq: 2\r\n

Transport: RTP/AVP/TCP;unicast

Authorization: 0731457378-01-20\r\n

\r\n

Real Time Streaming Protocol

Data (1 bytes)

No. Time Source Destination Protocol Length Fin Info

1286 45.734743 172.16.0.100 192.168.1.200 RTSP 170 Not set Reply: RTSP/1.0 200 OK[Unreassembled Packet]

Frame 1286: 170 bytes on wire (1360 bits), 170 bytes captured (1360 bits)

Ethernet II, Src: Cisco_3b:09:00 (00:1b:53:3b:09:00), Dst: Dell_57:4c:34 (5c:26:0a:57:4c:34)

Internet Protocol Version 4, Src: 172.16.0.100 (172.16.0.100), Dst: 192.168.1.200 (192.168.1.200)

Transmission Control Protocol, Src Port: rtsp (554), Dst Port: 51255 (51255), Seq: 197, Ack: 255, Len: 116

Real Time Streaming Protocol

Response: RTSP/1.0 200 OK\r\n

CSeq: 2\r\n

Date: 07/04/13 10:06:31\r\n

Session: 12407

Transport: RTP/AVP/TCP;unicast;server_port=556

[Unreassembled Packet: RTSP]

How many RTSP modes are support by SRX?

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