Network Connectivity

[Chris Plasun]

Hi Denys,

Yes, I got it working. What a learning experience!

I definitely prefer this over any GUI.

I have some other problems to work out, will definitely be emailing the 
list, very helpful!

Thanks,
Chris

Denys Vlasenko wrote:
> On Wednesday 15 April 2009 03:06, Chris Plasun wrote:
>>>> I'm having issues with network connectivity. I've been reading all day 
>>>> trying to get the board to connect to the LAN.
>>>>
>>>> LED's showing network connectivity are on but I can't ping anything on 
>>>> the network.
>>>>
>>> So this tells us that you have link so the hardware 
>>> thinks everything is happy.
>> Yes.
>>
>>>> I wouldn't spend time on DHCP until you know that the packets are even 
>>>> being sent out?  
>> That's exactly it. Ping didn't work.
>>
>> I thought I could use DHCP as a shortcut. Also, The start and end IP addresses
>> in /etc/udhcpd.conf were out of range of what we use.
> 
> Shock. How dare busybox project not to read your mind and not
> pre-select IP range specifically for you.
> 
> Okay, I am switching humor mode off.
> 
>> I thought maybe that could be it and changed the settings but to no avail...  
> 
> udhcpd is not a DHCP client, it's a DHCP server. You need udhcpc:
> 
> # udhcpc --help
> BusyBox v1.14.0.svn (2009-04-14 23:28:53 CEST) multi-call binary
> 
> Usage: udhcpc [-Cfbnqtvo] [-c CID] [-V VCLS] [-H HOSTNAME] [-i INTERFACE]
>         [-p pidfile] [-r IP] [-s script] [-O dhcp-option]...
> 
>         -V,--vendorclass=CLASSID        Vendor class identifier
>         -i,--interface=INTERFACE        Interface to use (default eth0)
>         -H,-h,--hostname=HOSTNAME       Client hostname
>         -c,--clientid=CLIENTID  Client identifier
>         -C,--clientid-none      Suppress default client identifier
>         -p,--pidfile=file       Create pidfile
>         -r,--request=IP         IP address to request
>         -s,--script=file        Run file at DHCP events (default /usr/share/udhcpc/default.script)
>         -t,--retries=N          Send up to N request packets
>         -T,--timeout=N          Try to get a lease for N seconds (default 3)
>         -A,--tryagain=N         Wait N seconds (default 20) after failure
>         -O,--request-option=OPT Request DHCP option OPT (cumulative)
>         -o,--no-default-options Do not request any options (unless -O is also given)
>         -f,--foreground Run in foreground
>         -b,--background Background if lease is not immediately obtained
>         -S,--syslog     Log to syslog too
>         -n,--now        Exit with failure if lease is not immediately obtained
>         -q,--quit       Quit after obtaining lease
>         -R,--release    Release IP on quit
>         -a,--arping     Use arping to validate offered address
> 
> Note: just running "udhcpc --interface=eth0" in many cases don't work.
> It's crucial to have --script=... and have that script to correctly
> interpret the data from udhcpc and set up address, routing, and DNS.
> 
> In distributions, this is usually "sugar coated" behind some GUI,
> but since you seem to do it w/o distro help, it's YOUR responsibility
> to ensure the script works correctly. busybox's source tree
> has examples in examples/udhcp/*. I can't guarantee they are 100% correct,
> but should be a good starting point.
> 
> Use --foreground option for test runs to not torture yourself
> by fishing udhcpc messages from syslog and killing it with kill <PID>.
> With --foreground, messages go to screen and ^C kills.
> 
> Don't forget "ip link set dev eth0 up" too in order to be able
> to send anything at all...
> 
>>>> Have you tried assigning just a static ip address to 
>>>> the interface??
>> That was going to be the next step.
> 
> I'd say that, as a test, had to be a 1st step, as it is less complex.
> --
> vda
>