ethereal count of g711 call using 20ms

convenientstore

I am looking at the RTP packet captured in ethreal.

I see total size of 214 bytes

ethereal+ip+udp+rtp+payload

I am assuming 40 + 160(20ms of g711).. but why is ethreal equaling out to 14 bytes?

is it possible to not include CRC(4 bytes) in ethreal in this case??

can someone explain ?

dtlokee

If you look under the "ethernet II" heading it should list the source mac(6 bytes), destination mac(6 bytes) and ethertype of 0x800 (2 bytes) giving you 14 bytes, the CRC should not be displayed (I guess the NIC strips this off before wireshark can capture it)

That would be 14 bytes (even though we know it's 1

So

g711 at 50pps gives us 160 bytes
The IP header would be 20 bytes
The UDP header is 8 bytes
The RTP header is 12 bytes
The Ethernet header is 18 bytes

Total would be 218 bytes, but it would seem the 4 crc bytes are missing from the output.

convenientstore

I wonder why it's stripping off the CRC........ but thanks!!