42 is the length of the ARP request and make sure the other side sends out ARP reply, otherwise, the Ping will always fail due to routing issue.
On Fri, Jun 15, 2012 at 9:31 AM, Weixian Zhou <idea...@gmail.com> wrote: > 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 > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- Alex, *Dreams can come true – just believe.*
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