Wireshark-dev: [Wireshark-dev] ENC: Wireshark-dev: Re: RTCP frame length error indication in RT
From: "Herculano Antonio Lambert Duarte" <[email protected]>
Date: Tue, 8 Jan 2008 19:25:47 -0200
Hi!

	Sorry for the delay.
	 
	Attached is a packet with a RTCP Bye, and the error indication.
	 
	Thank you for your attention.
	 
	Best regards,
	 
	Herculano
	 
	=====================================================
	From: "Martin Mathieson" <[email protected] <mailto:[email protected]> >
	Date: Thu, 20 Dec 2007 16:52:01 +0000
	
	Could you please post this as a capture? Remember that the string is NULL terminated, and that this is part of the length....
	 
	=====================================================
	On Dec 20, 2007 2:34 PM, Herculano Antonio Lambert Duarte < [email protected] <mailto:[email protected]> > wrote:
	

		Hi!
		
		When the RTCP packet has a BYE chunk included, there is an expert message "RTCP frame length check: wrong (expected 104 bytes, found 108)" (the numbers belong to an example captured in field test), but the number of octets is correct (see the example below). 
		
		===
		Frame 1457 (146 bytes on wire, 146 bytes captured)
		Ethernet II, Src: TróPicoS_00:00:99 (00:1a:90:00:00:99), Dst: Unispher_40:68:71 (00:90:1a:40:68:71)
		Internet Protocol, Src: 200.168.14.107 (200.168.14.107), Dst: 200.168.13.203 (200.168.13.203 )
		User Datagram Protocol, Src Port: 32061 (32061), Dst Port: 5273 (5273)
		Real-time Transport Control Protocol (Sender Report)
		   [Stream setup by SDP (frame 260)]
		   10.. .... = Version: RFC 1889 Version (2) 
		   ..0. .... = Padding: False
		   ...0 0001 = Reception report count: 1
		   Packet type: Sender Report (200)
		   Length: 12 (52 bytes)
		   Sender SSRC: 0x12345678 (305419896)
		   Timestamp, MSW: 29 (0x0000001d) 
		   Timestamp, LSW: 3444563771 (0xcd4fdf3b)
		   [MSW and LSW as NTP timestamp: Feb  7, 2036 06:28:45,8020 UTC]
		   RTP timestamp: 1476661580
		   Sender's packet count: 300
		   Sender's octet count: 4236 
		   Source 1
		Real-time Transport Control Protocol (Source description)
		   [Stream setup by SDP (frame 260)]
		   10.. .... = Version: RFC 1889 Version (2)
		   ..0. .... = Padding: False
		   ...0 0001 = Source count: 1 
		   Packet type: Source description (202)
		   Length: 6 (28 bytes)
		   Chunk 1, SSRC/CSRC 0x12345678
		Real-time Transport Control Protocol (Goodbye)
		   [Stream setup by SDP (frame 260)]
		   10.. .... = Version: RFC 1889 Version (2) 
		   ..0. .... = Padding: False
		   ...0 0001 = Source count: 1
		   Packet type: Goodbye (203)
		   Length: 5 (24 bytes)
		   Identifier: 0x12345678 (305419896)
		   Length: 15
		   Text: session stopped
		[RTCP frame length check: Wrong (expected 104 bytes, found 108)]
		===
		
		Herculano A. L. Duarte

Attachment: rtcp-bye.cap
Description: rtcp-bye.cap