On this link I found few informations about use of tcpdump.
But, can you give me more information about example showed on that page:
tcpdump -s 128 -vvv -T rtcp src orac and port 57393
11:58:52.027102 orac.erg.abdn.ac.uk.1053 > 224.2.156.220.57393: sr 489542890 @3238744444.18 2584794646 12583800p 2794620371b 489542890
1l 12646339s 0j @0.00+0.00 sdes 60 489542890 (ttl 127, id 19051, len 140)
11:58:55.772400 orac.erg.abdn.ac.uk.1053 > 224.2.156.220.57393: sr 489542890 @3238744447.93 2585131669 12583837p 2794653187b 489542890
1l 12646376s 0j @0.00+0.00 sdes 60 489542890 (ttl 127, id 19089, len 140)
11:59:00.478495 orac.erg.abdn.ac.uk.1053 > 224.2.156.220.57393: sr 489542890 @3238744452.64 2585555168 12583874p 2794686955b 489542890
1l 12646413s 0j @0.00+0.00 sdes 60 489542890 (ttl 127, id 19127, len 140)
11:59:07.916442 orac.erg.abdn.ac.uk.1053 > 224.2.156.220.57393: sr 489542890 @3238744460.07 2586224502 12583901p 2794700449b 489542890
1l 12646440s 0j @0.00+0.00 sdes 60 489542890 (ttl 127, id 19155, len 140)
11:59:13.840491 orac.erg.abdn.ac.uk.1053 > 224.2.156.220.57393: sr 489542890 @3238744466.00 2586757598 12583931p 2794716009b 489542890
1l 12646470s 0j @0.00+0.00 sdes 60 489542890 (ttl 127, id 19186, len 140)
I do not understand exactly what means sign > in this case.
Thank you in advance!