J’ai jeté un œil à cette page pour en déduire que le protocole RTSP utilisait le port 554 en TCP et UDP.
Bon, j’ai pris une chaîne au hasard et j’ai tenté de l’ouvrir avec mplayer :
┌ (gilles@Thorn + 0) (19/12/20 - 7:37:32) (0.59 - 0%) (~)
└% mplayer 'rtsp://mafreebox.freebox.fr/fbxtv_pub/stream?namespace=1&service=400'
MPlayer 1.3.0 (Debian), built with gcc-9 (C) 2000-2016 MPlayer Team
do_connect: could not connect to socket
connect: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.
Playing rtsp://mafreebox.freebox.fr/fbxtv_pub/stream?namespace=1&service=400.
Resolving mafreebox.freebox.fr for AF_INET6...
Couldn't resolve name for AF_INET6: mafreebox.freebox.fr
Resolving mafreebox.freebox.fr for AF_INET...
Connecting to server mafreebox.freebox.fr[212.27.38.253]: 554...
bind: Cannot assign requested address
rtsp_session: unsupported RTSP server. Server type is 'fbxrtspd/1.2 Freebox RTSP server'.
libavformat version 58.29.100 (external)
libavformat file format detected.
[rtsp @ 0x7f463c83d600]UDP timeout, retrying with TCP
[rtsp @ 0x7f463c83d600]method PAUSE failed: 551 Option Not Supported
LAVF_header: av_find_stream_info() failed
LAVF: no audio or video headers found - broken file?
Exiting... (End of file)
┌ (gilles@Thorn + 0) (19/12/20 - 7:37:52) (0.49 - 0%) (~)
└% mplayer 'rtsp://mafreebox.freebox.fr/fbxtv_pub/stream?namespace=1&service=400'
MPlayer 1.3.0 (Debian), built with gcc-9 (C) 2000-2016 MPlayer Team
do_connect: could not connect to socket
connect: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.
Playing rtsp://mafreebox.freebox.fr/fbxtv_pub/stream?namespace=1&service=400.
Resolving mafreebox.freebox.fr for AF_INET6...
Couldn't resolve name for AF_INET6: mafreebox.freebox.fr
Resolving mafreebox.freebox.fr for AF_INET...
Connecting to server mafreebox.freebox.fr[212.27.38.253]: 554...
bind: Cannot assign requested address
rtsp_session: unsupported RTSP server. Server type is 'fbxrtspd/1.2 Freebox RTSP server'.
libavformat version 58.29.100 (external)
libavformat file format detected.
[rtsp @ 0x7f3f7c268600]UDP timeout, retrying with TCP
[rtsp @ 0x7f3f7c268600]method PAUSE failed: 551 Option Not Supported
LAVF_header: av_find_stream_info() failed
LAVF: no audio or video headers found - broken file?
Exiting... (End of file)
┌ (gilles@Thorn + 0) (19/12/20 - 7:39:03) (0.43 - 0%) (~)
└%
et, pendant ce temps, sur Lookout :
┌ (gilles@Lookout + 0) (19/12/20 - 7:38:22) (0.48 - 0%) (~)
└% sudo tcpdump -nni eth0 tcp port 554 or udp port 554
[sudo] gilles@Lookout Password :
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
07:38:53.823932 IP 82.65.155.50.55972 > 212.27.38.253.554: Flags [S], seq 2493479511, win 64240, options [mss 1460,sackOK,TS val 1218785874 ecr 0,nop,wscale 7], length 0
07:38:53.824879 IP 212.27.38.253.554 > 82.65.155.50.55972: Flags [S.], seq 3460915232, ack 2493479512, win 65160, options [mss 1460,sackOK,TS val 26384961 ecr 1218785874,nop,wscale 7], length 0
07:38:53.825428 IP 82.65.155.50.55972 > 212.27.38.253.554: Flags [.], ack 1, win 502, options [nop,nop,TS val 1218785876 ecr 26384961], length 0
07:38:53.825491 IP 82.65.155.50.55972 > 212.27.38.253.554: Flags [P.], seq 1:51, ack 1, win 502, options [nop,nop,TS val 1218785876 ecr 26384961], length 50: RTSP: OPTIONS rtsp://mafreebox.freebox.fr:554 RTSP/1.0
07:38:53.825581 IP 212.27.38.253.554 > 82.65.155.50.55972: Flags [.], ack 51, win 509, options [nop,nop,TS val 26384963 ecr 1218785876], length 0
07:38:53.826065 IP 82.65.155.50.55972 > 212.27.38.253.554: Flags [P.], seq 51:386, ack 1, win 502, options [nop,nop,TS val 1218785876 ecr 26384963], length 335: RTSP
07:38:53.826183 IP 212.27.38.253.554 > 82.65.155.50.55972: Flags [.], ack 386, win 507, options [nop,nop,TS val 26384963 ecr 1218785876], length 0
07:38:53.826335 IP 212.27.38.253.554 > 82.65.155.50.55972: Flags [P.], seq 1:128, ack 386, win 507, options [nop,nop,TS val 26384963 ecr 1218785876], length 127: RTSP: RTSP/1.0 200 OK
07:38:53.826778 IP 82.65.155.50.55972 > 212.27.38.253.554: Flags [.], ack 128, win 502, options [nop,nop,TS val 1218785877 ecr 26384963], length 0
07:38:53.826824 IP 82.65.155.50.55972 > 212.27.38.253.554: Flags [P.], seq 386:478, ack 128, win 502, options [nop,nop,TS val 1218785877 ecr 26384963], length 92: RTSP: DESCRIBE rtsp://mafreebox.freebox.fr:554/fbxtv_pub/stream?namespace=1&service=400 RTSP/1.0
07:38:53.826902 IP 212.27.38.253.554 > 82.65.155.50.55972: Flags [.], ack 478, win 507, options [nop,nop,TS val 26384964 ecr 1218785877], length 0
07:38:53.827359 IP 82.65.155.50.55972 > 212.27.38.253.554: Flags [P.], seq 478:514, ack 128, win 502, options [nop,nop,TS val 1218785878 ecr 26384964], length 36: RTSP
07:38:53.827467 IP 212.27.38.253.554 > 82.65.155.50.55972: Flags [.], ack 514, win 507, options [nop,nop,TS val 26384965 ecr 1218785878], length 0
07:38:53.827620 IP 212.27.38.253.554 > 82.65.155.50.55972: Flags [P.], seq 128:536, ack 514, win 507, options [nop,nop,TS val 26384965 ecr 1218785878], length 408: RTSP: RTSP/1.0 200 OK
07:38:53.828099 IP 82.65.155.50.55972 > 212.27.38.253.554: Flags [.], ack 536, win 501, options [nop,nop,TS val 1218785879 ecr 26384965], length 0
07:38:53.828161 IP 82.65.155.50.55972 > 212.27.38.253.554: Flags [P.], seq 514:603, ack 536, win 501, options [nop,nop,TS val 1218785879 ecr 26384965], length 89: RTSP: SETUP rtsp://mafreebox.freebox.fr:554/fbxtv_pub/stream?namespace=1&service=400 RTSP/1.0
07:38:53.828230 IP 212.27.38.253.554 > 82.65.155.50.55972: Flags [.], ack 603, win 507, options [nop,nop,TS val 26384965 ecr 1218785879], length 0
07:38:53.828693 IP 82.65.155.50.55972 > 212.27.38.253.554: Flags [P.], seq 603:678, ack 536, win 501, options [nop,nop,TS val 1218785879 ecr 26384965], length 75: RTSP
07:38:53.828812 IP 212.27.38.253.554 > 82.65.155.50.55972: Flags [.], ack 678, win 507, options [nop,nop,TS val 26384966 ecr 1218785879], length 0
07:38:53.831139 IP 212.27.38.253.554 > 82.65.155.50.55972: Flags [P.], seq 536:879, ack 678, win 507, options [nop,nop,TS val 26384968 ecr 1218785879], length 343: RTSP: RTSP/1.0 200 OK
07:38:53.831627 IP 82.65.155.50.55972 > 212.27.38.253.554: Flags [.], ack 879, win 501, options [nop,nop,TS val 1218785882 ecr 26384968], length 0
07:38:53.831877 IP 82.65.155.50.55972 > 212.27.38.253.554: Flags [P.], seq 678:766, ack 879, win 501, options [nop,nop,TS val 1218785882 ecr 26384968], length 88: RTSP: PLAY rtsp://mafreebox.freebox.fr:554/fbxtv_pub/stream?namespace=1&service=400 RTSP/1.0
07:38:53.831987 IP 212.27.38.253.554 > 82.65.155.50.55972: Flags [.], ack 766, win 507, options [nop,nop,TS val 26384969 ecr 1218785882], length 0
07:38:53.832415 IP 82.65.155.50.55972 > 212.27.38.253.554: Flags [P.], seq 766:831, ack 879, win 501, options [nop,nop,TS val 1218785883 ecr 26384969], length 65: RTSP
07:38:53.832536 IP 212.27.38.253.554 > 82.65.155.50.55972: Flags [.], ack 831, win 507, options [nop,nop,TS val 26384970 ecr 1218785883], length 0
07:38:53.832658 IP 212.27.38.253.554 > 82.65.155.50.55972: Flags [P.], seq 879:1214, ack 831, win 507, options [nop,nop,TS val 26384970 ecr 1218785883], length 335: RTSP: RTSP/1.0 200 OK
07:38:53.833097 IP 82.65.155.50.55972 > 212.27.38.253.554: Flags [.], ack 1214, win 501, options [nop,nop,TS val 1218785884 ecr 26384970], length 0
07:38:53.833465 IP 82.65.155.50.55972 > 212.27.38.253.554: Flags [P.], seq 831:923, ack 1214, win 501, options [nop,nop,TS val 1218785884 ecr 26384970], length 92: RTSP: TEARDOWN rtsp://mafreebox.freebox.fr:554/fbxtv_pub/stream?namespace=1&service=400 RTSP/1.0
07:38:53.833523 IP 82.65.155.50.55972 > 212.27.38.253.554: Flags [FP.], seq 923:971, ack 1214, win 501, options [nop,nop,TS val 1218785884 ecr 26384970], length 48: RTSP
07:38:53.833598 IP 212.27.38.253.554 > 82.65.155.50.55972: Flags [.], ack 923, win 507, options [nop,nop,TS val 26384971 ecr 1218785884], length 0
07:38:53.834903 IP 212.27.38.253.554 > 82.65.155.50.55972: Flags [F.], seq 1214, ack 972, win 507, options [nop,nop,TS val 26384972 ecr 1218785884], length 0
07:38:53.835466 IP 82.65.155.50.55972 > 212.27.38.253.554: Flags [.], ack 1215, win 501, options [nop,nop,TS val 1218785886 ecr 26384972], length 0
07:38:53.837360 IP 82.65.155.50.55974 > 212.27.38.253.554: Flags [S], seq 1819960545, win 64240, options [mss 1460,sackOK,TS val 1218785888 ecr 0,nop,wscale 7], length 0
07:38:53.837599 IP 212.27.38.253.554 > 82.65.155.50.55974: Flags [S.], seq 3698344528, ack 1819960546, win 65160, options [mss 1460,sackOK,TS val 26384975 ecr 1218785888,nop,wscale 7], length 0
07:38:53.838124 IP 82.65.155.50.55974 > 212.27.38.253.554: Flags [.], ack 1, win 502, options [nop,nop,TS val 1218785889 ecr 26384975], length 0
07:38:53.838186 IP 82.65.155.50.55974 > 212.27.38.253.554: Flags [P.], seq 1:130, ack 1, win 502, options [nop,nop,TS val 1218785889 ecr 26384975], length 129: RTSP: OPTIONS rtsp://mafreebox.freebox.fr:554/fbxtv_pub/stream?namespace=1&service=400 RTSP/1.0
07:38:53.838322 IP 212.27.38.253.554 > 82.65.155.50.55974: Flags [.], ack 130, win 509, options [nop,nop,TS val 26384975 ecr 1218785889], length 0
07:38:53.838478 IP 212.27.38.253.554 > 82.65.155.50.55974: Flags [P.], seq 1:128, ack 130, win 509, options [nop,nop,TS val 26384976 ecr 1218785889], length 127: RTSP: RTSP/1.0 200 OK
07:38:53.838999 IP 82.65.155.50.55974 > 212.27.38.253.554: Flags [.], ack 128, win 502, options [nop,nop,TS val 1218785889 ecr 26384976], length 0
07:38:53.839045 IP 82.65.155.50.55974 > 212.27.38.253.554: Flags [P.], seq 130:285, ack 128, win 502, options [nop,nop,TS val 1218785890 ecr 26384976], length 155: RTSP: DESCRIBE rtsp://mafreebox.freebox.fr:554/fbxtv_pub/stream?namespace=1&service=400 RTSP/1.0
07:38:53.839168 IP 212.27.38.253.554 > 82.65.155.50.55974: Flags [.], ack 285, win 508, options [nop,nop,TS val 26384976 ecr 1218785890], length 0
07:38:53.839277 IP 212.27.38.253.554 > 82.65.155.50.55974: Flags [P.], seq 128:536, ack 285, win 508, options [nop,nop,TS val 26384976 ecr 1218785890], length 408: RTSP: RTSP/1.0 200 OK
07:38:53.839804 IP 82.65.155.50.55974 > 212.27.38.253.554: Flags [.], ack 536, win 501, options [nop,nop,TS val 1218785890 ecr 26384976], length 0
07:38:53.840157 IP 82.65.155.50.55974 > 212.27.38.253.554: Flags [P.], seq 285:468, ack 536, win 501, options [nop,nop,TS val 1218785891 ecr 26384976], length 183: RTSP: SETUP rtsp://mafreebox.freebox.fr:554/fbxtv_pub/stream?namespace=1&service=400 RTSP/1.0
07:38:53.840297 IP 212.27.38.253.554 > 82.65.155.50.55974: Flags [.], ack 468, win 507, options [nop,nop,TS val 26384977 ecr 1218785891], length 0
07:38:53.841605 IP 212.27.38.253.554 > 82.65.155.50.55974: Flags [P.], seq 536:879, ack 468, win 507, options [nop,nop,TS val 26384979 ecr 1218785891], length 343: RTSP: RTSP/1.0 200 OK
07:38:53.842116 IP 82.65.155.50.55974 > 212.27.38.253.554: Flags [.], ack 879, win 501, options [nop,nop,TS val 1218785893 ecr 26384979], length 0
07:38:53.842650 IP 82.65.155.50.55974 > 212.27.38.253.554: Flags [P.], seq 468:639, ack 879, win 501, options [nop,nop,TS val 1218785893 ecr 26384979], length 171: RTSP: PLAY rtsp://mafreebox.freebox.fr:554/fbxtv_pub/stream?namespace=1&service=400 RTSP/1.0
07:38:53.842750 IP 212.27.38.253.554 > 82.65.155.50.55974: Flags [.], ack 639, win 506, options [nop,nop,TS val 26384980 ecr 1218785893], length 0
07:38:53.842868 IP 212.27.38.253.554 > 82.65.155.50.55974: Flags [P.], seq 879:1214, ack 639, win 506, options [nop,nop,TS val 26384980 ecr 1218785893], length 335: RTSP: RTSP/1.0 200 OK
07:38:53.843312 IP 82.65.155.50.55974 > 212.27.38.253.554: Flags [.], ack 1214, win 501, options [nop,nop,TS val 1218785894 ecr 26384980], length 0
07:39:03.855735 IP 82.65.155.50.55974 > 212.27.38.253.554: Flags [P.], seq 639:792, ack 1214, win 501, options [nop,nop,TS val 1218795906 ecr 26384980], length 153: RTSP: PAUSE rtsp://mafreebox.freebox.fr:554/fbxtv_pub/stream?namespace=1&service=400 RTSP/1.0
07:39:03.855995 IP 212.27.38.253.554 > 82.65.155.50.55974: Flags [.], ack 792, win 505, options [nop,nop,TS val 26394993 ecr 1218795906], length 0
07:39:03.856095 IP 212.27.38.253.554 > 82.65.155.50.55974: Flags [P.], seq 1214:1411, ack 792, win 505, options [nop,nop,TS val 26394993 ecr 1218795906], length 197: RTSP: RTSP/1.0 551 Option Not Supported
07:39:03.856570 IP 82.65.155.50.55974 > 212.27.38.253.554: Flags [.], ack 1411, win 501, options [nop,nop,TS val 1218795907 ecr 26394993], length 0
07:39:03.856967 IP 82.65.155.50.55974 > 212.27.38.253.554: Flags [P.], seq 792:948, ack 1411, win 501, options [nop,nop,TS val 1218795907 ecr 26394993], length 156: RTSP: TEARDOWN rtsp://mafreebox.freebox.fr:554/fbxtv_pub/stream?namespace=1&service=400 RTSP/1.0
07:39:03.857026 IP 82.65.155.50.55974 > 212.27.38.253.554: Flags [F.], seq 948, ack 1411, win 501, options [nop,nop,TS val 1218795907 ecr 26394993], length 0
07:39:03.857279 IP 212.27.38.253.554 > 82.65.155.50.55974: Flags [.], ack 948, win 504, options [nop,nop,TS val 26394994 ecr 1218795907], length 0
07:39:03.858231 IP 212.27.38.253.554 > 82.65.155.50.55974: Flags [F.], seq 1411, ack 949, win 504, options [nop,nop,TS val 26394995 ecr 1218795907], length 0
07:39:03.858729 IP 82.65.155.50.55974 > 212.27.38.253.554: Flags [.], ack 1412, win 501, options [nop,nop,TS val 1218795909 ecr 26394995], length 0
^C
60 packets captured
61 packets received by filter
0 packets dropped by kernel
┌ (gilles@Lookout + 0) (19/12/20 - 7:39:38) (0.20 - 0%) (~)
└%
Je ne sais pas trop quoi déduire de ça, si ce n’est que l’IPv6 ne semble pas être de la partie.