Re: [ECOS] Ethernet arp/problem

["Erik Reikes" <ereikes at hotmail dot com>]

>hi erik,
>
>i had some similar problems and may be able
>to help you. can you please provide some more information:

Thanks for the reply I've got some further characterization of the problem, 
but first let me answer your questions.

>
>host?

PC running cygwin

>target?

MPC860T A&M Viper board

>ecos revision?

The config tool is 1.3.net and the sources are latest from CVS.

>are you using redboot?
Yes.

>if so, is the network involved in redboot?
I am running the debugger over the serial port for Redboot.  I haven't been 
able to get TCP debugging to work properly.  Redboot is setup for a fixed IP 
address that is different from the one that is being DHCP'd in the ping 
test.

>if so, how is redboot getting IP address?
It is fixed, but I'm not using it for debug.  Maybe I should build a redboot 
with no ethernet support?

my network is of the 192.168.0.XXX type.  Netmask looks right.  After ecos 
successfully DHCP's its IP is 192.168.0.5.  I see a bunch of arp-who-has 
192.168.0.5 tell 192.168.0.5's with no response.  Its like the Viper board 
is not properly updating its ARP cache or is not receiving ARP broadcasts or 
something.

After this when it tries to ping I see a bunch of arp requests for the 
destination and a bunch of replies with the proper MAC for the destination 
but no ICP traffic whatsoever.  Weird.

I turned off optimization on the kernel and switched from static to DHCP 
before this problem surfaced.  I'm going to try to switch back and see if 
this helps.

Any thoughts you might have would be helpful at this point.

Thanks.

-Erik Reikes



>
>On Fri, 8 Mar 2002, Erik Reikes wrote:
>
> > I'm having a bit of weirdness with the ping_test.  It was working 
>originally
> > when I had set ecos up with a static address, but when I switched to 
>DHCP it
> > stopped, and now after having switched back it is still out to lunch.
> >
> > A tcpdump indicates that ARP who-has requests are going out and being
> > replied to, but the ICMP ping packets no longer go out.  I had rebuilt 
>the
> > library and the tests after changing the DHCP options.  Is there a 
>setting
> > that could cause this to happen?  Iguess the basic symptom is that no 
>TCP
> > packets go out, but broadcast ethernet traffic like ARP's and BOOTP's go 
>out
> > fine (it is able to DHCP its IP address fine).
> >
> > Any help would be appreciated.
> >
> > -Erik Reikes
> >
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