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RE: [microblaze-uclinux] network bad working?
Greetings Raul,
I think if you look at the network traffic you will find that the board is never answering any ARP request. The behavior of ARP is such that any host that answers an ARP request (such as from the board to the PC) will cache the requester's physical (MAC) address. For this reason the PC will know what address the board has without sending an ARP request of its own after the board pings the PC.
I have seen this behavior before. If you ping the PC from your board and establish communications, after about 10 minutes you will find that the PC can no longer find your board. That is the period needed for the ARP cache to drop your board's physical address.
A network packet analyzer, like wireshark (http://www.wireshark.org/), will be helpful in determining exactly what traffic is being sent and responded to in this situation. A short time with a packet analyzer will show you what is happening on the wire. From there it should be easy to figure out what is not working.
Regards,
Roger W. Cover
-----Original Message-----
From: owner-microblaze-uclinux@xxxxxxxxxxxxxx [mailto:owner-microblaze-uclinux@xxxxxxxxxxxxxx] On Behalf Of Raul Camaras
Sent: Wednesday, March 28, 2007 5:48 AM
To: microblaze-uclinux@xxxxxxxxxxxxxx
Subject: AW: [microblaze-uclinux] network bad working?
Hello,
thank you John for you answer/s.
However I did everything right with the network
configuration(netmask/broadcast) and it looks like again, that the
board(uclinux) doesn't answer to the first arp request(s) from the host
to know the MAC address of the microblaze board, just after a ping is
done from the board, it starts answering.
Any idea how can this be solved? So that I don't need to ping first to
let it work.
Thanks a lot.
- Raul Camaras
-----Ursprüngliche Nachricht-----
Von: owner-microblaze-uclinux@xxxxxxxxxxxxxx
[mailto:owner-microblaze-uclinux@xxxxxxxxxxxxxx] Im Auftrag von John
Williams
Gesendet: Mittwoch, 28. März 2007 01:27
An: microblaze-uclinux@xxxxxxxxxxxxxx
Betreff: Re: [microblaze-uclinux] network bad working?
Hi Raul,
Raul Camaras wrote:
> Hello,
>
> I have a problem with the network behaviour.
> I don't use DHCPCD, and I set the IP address of the board with
ifconfig
> so:
I think this is an issue with your network configuration -
netmask/broadcast etc.
Firstly, you should check the netmask/broadcast ifconfig settings on
your host - make sure they match what you are getting on your microblaze
board.
See below for more:
> #ifconfig eth0 192.168.100.6 netmask 255.255.0.0
>
> after that, ifconfig looks so:
>
> #ifconfig
> eth0 Link encap:Ethernet HWaddr 00:00:C0:A3:E5:44
> inet addr:192.168.100.6 Bcast:192.168.100.255
> Mask:255.255.0.0
Shouldn't the broadcast address be 192.168.255.255, for a netmask of
255.255.0.0 (a /16 network)?
#ifconfig eth0 192.168.100.6 netmask 255.255.0.0 broadcast
192.168.255.255
What is the broadcast setting on the host?
Regards,
John
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