I am doing test with tunnel.py and following the readme instructions located gnuradio/gr-digital/examples/narrowband.
on machine A:
sudo ./tunnel.py --tx-freq=2.51G --rx-freq=2.515G -c 50 -r 0.5M
then
sudo ifconfig gr0 192.168.200.1
on machine B:
sudo ./tunnel.py --tx-freq=2.515G --rx-freq=2.51G -c 50 -r 0.5M
then
sudo ifconfig gr0 192.168.200.2
Then I can see packages tx/rx on both machines:
URx: ok = True len(payload) = 54
Rx: ok = True len(payload) = 90
Rx: ok = True len(payload) = 353
Tx: len(payload) = 90
Tx: len(payload) = 54
...
After I ping from A to B, I found A only sends packages of fixed size 42:
UTx: len(payload) = 42
UTx: len(payload) = 42
UTx: len(payload) = 42
UTx: len(payload) = 42
...
But the default package size of ping is 56 from the man page. Where did the packages of size 42 come from? Anyone has idea?
I am using two USRP N210s, the daughter boards are both XCVR2450.
--
Regards,
Weixian Zhou
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