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AW: [microblaze-uclinux] network bad working?
Hi Roger,
Thanks for your mail.
On the contrary, the board answer arp requests and works perfect, all
just after sending something after ifconfig. I found a program to send
an UDP package to the network, and execute it after executing ifconfig
on the board, and it worked fine. But that is a bad solution, because
something in the initialization of the ethernet goes wrong, but what, I
havent found yet.
I used tcpdump(under linux) to analyze the network traffic, though I
also tried wireshark :=)
Best regards,
- Raul
>-----Ursprüngliche Nachricht-----
>Von: owner-microblaze-uclinux@xxxxxxxxxxxxxx
[mailto:owner-microblaze-uclinux@xxxxxxxxxxxxxx] Im Auftrag von Roger
Cover
>Gesendet: Mittwoch, 28. März 2007 17:19
>An: microblaze-uclinux@xxxxxxxxxxxxxx
>Betreff: 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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