On 10/31/2011 06:01 PM, Tuan (Johnny) Ta wrote:
I have been running into problems using tunnel.py as well so instead
of creating a new post I thought I'll just continue this thread.
My setting:
USRP2
XCVR2450
Ubuntu 10.04 (32bit)
The problem I have is that after running tunnel, whenever I do ping,
my system gets stuck on the ARP exchange. Say A wants to ping B. A
broadcasts an ARP packet to find the MAC address of B's IP. B gets the
ARP request, immediately sends an ARP response back to A with its MAC.
However, in my system, A never gets the ARP reply.
I seriously can't think of a reason for this. I can guess a possible
cause is that B sends the ARP reply too quickly that A doesn't have
enough time to go from transmit mode to receive mode (XCVR2450 is a
half-duplex daughterboard). But I don't know how to verify this
hypothesis.
Can anyone help me?
Thank you,
Johnny
We used to have this problem "back in the day" with packet-radio, using
analog FM transceivers--they were often notoriously sluggish
in turning around the TX/RX logic.
You might try zero-stuffing the TX frames--that's basically what we did
back in the day. Although the XCVR2450 short turn around fairly
quickly, it's not infinitely quick.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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