[Buildroot] Buildroot networking problems

[Buildroot] Buildroot networking problems

[Jigar SOLANKI]

Hi all,

I've built a Buildroot Linux on a Leon3 CPU, everything works fine
except the network configuration.

I have the eth0 interface configured correctly with a default gw,
netmask etc...but when I ping the interface adress itself, it doesnt
respond at all.

I've also tried to ping 127.0.0.1, same result, lo is not responding.
(I have read some posts on resolv.conf but in my case, it is not a dns
related issue, I ping numerical adresses..)

Any idea on what is going wrong ?

-- 
Jigar SOLANKI

LaBRI - UMR 5800
Universit? Bordeaux 1
351 Cours de la Lib?ration
F-33405 Talence Cedex
Phone : (+33) 5 4000 24 87
Fax   : (+33) 5 4000 66 69
Web   : http://www.labri.fr/perso/solanki

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[Buildroot] Buildroot networking problems

[Peter Korsgaard]

>>>>> "Jigar" == Jigar SOLANKI <jigar.solanki@labri.fr> writes:

 Jigar> Hi all,
 Jigar> I've built a Buildroot Linux on a Leon3 CPU, everything works fine
 Jigar> except the network configuration.

 Jigar> I have the eth0 interface configured correctly with a default gw,
 Jigar> netmask etc...but when I ping the interface adress itself, it doesnt
 Jigar> respond at all.

 Jigar> I've also tried to ping 127.0.0.1, same result, lo is not responding.
 Jigar> (I have read some posts on resolv.conf but in my case, it is not a dns
 Jigar> related issue, I ping numerical adresses..)

Please provide some more info. Please paste output of ipconfig -a. What
kind of errors do you get?

-- 
Bye, Peter Korsgaard

[Buildroot] Buildroot networking problems

[Jigar SOLANKI]

Le 06/02/2012 21:37, Peter Korsgaard a ?crit :
>>>>>> "Jigar" == Jigar SOLANKI <jigar.solanki@labri.fr> writes:
> 
>  Jigar> Hi all,
>  Jigar> I've built a Buildroot Linux on a Leon3 CPU, everything works fine
>  Jigar> except the network configuration.
> 
>  Jigar> I have the eth0 interface configured correctly with a default gw,
>  Jigar> netmask etc...but when I ping the interface adress itself, it doesnt
>  Jigar> respond at all.
> 
>  Jigar> I've also tried to ping 127.0.0.1, same result, lo is not responding.
>  Jigar> (I have read some posts on resolv.conf but in my case, it is not a dns
>  Jigar> related issue, I ping numerical adresses..)
> 
> Please provide some more info. Please paste output of ipconfig -a. What
> kind of errors do you get?
> 

I do not have any errors. The ping just simply do not respond. The
packets are lost.

There are two interfaces eth0 and lo.

eth0 : 10.10.10.0/24  IP:10.10.10.1 Gw : 10.10.10.254

So, when I ping 10.10.10.254 from 10.10.10.1, I dont have any response :
the packets are lost, tcpdump on the gw (10.10.10.254) shows incoming
ICMP packets, though !

When I ping 10.10.10.1 from 10.10.10.254, same result, no response, but
incomming ICMP requests are correctly seen !

And last test, when I ping 127.0.0.1, exactly same result : no response
at all, the packets are lost.

I have checked iptables (everything is allowed) and I have checked
/proc/net/icmp_ignore_all is set to 0, icmp_ignore_broadcast is set to 1.

So I tried TCP : telnet 10.10.10.254 22 (  I have a ssh daemon running
on the gateway), no response from the gateway (I still see incomming TCP
SYN on the gateway though.)

Here's the requested output(ifconfig -a ; route -n; some pings):


# ifconfig -a
eth0      Link encap:Ethernet  HWaddr 00:00:7C:CC:01:45
          inet addr:10.10.10.1  Bcast:10.10.10.255  Mask:255.255.255.0
          inet6 addr: fe80::200:7cff:fecc:145/64 Scope:Link
          UP BROADCAST RUNNING  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:398 (398.0 B)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:3 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:252 (252.0 B)  TX bytes:252 (252.0 B)

sit0      Link encap:IPv6-in-IPv4
          NOARP  MTU:1480  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use
Iface
10.10.10.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0
0.0.0.0         10.10.10.254    0.0.0.0         UG    0      0        0 eth0

# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use
Iface
10.10.10.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0
0.0.0.0         10.10.10.254    0.0.0.0         UG    0      0        0 eth0

# ping -c 5 127.0.0.1
PING 127.0.0.1 (127.0.0.1): 56 data bytes

--- 127.0.0.1 ping statistics ---
5 packets transmitted, 0 packets received, 100% packet loss
# ping -c 5 10.10.10.1
PING 10.10.10.1 (10.10.10.1): 56 data bytes

--- 10.10.10.1 ping statistics ---
5 packets transmitted, 0 packets received, 100% packet loss
# ping -c 5 10.10.10.254
PING 10.10.10.254 (10.10.10.254): 56 data bytes

--- 10.10.10.254 ping statistics ---
5 packets transmitted, 0 packets received, 100% packet loss



-- 
Jigar SOLANKI

LaBRI - UMR 5800
Universit? Bordeaux 1
351 Cours de la Lib?ration
F-33405 Talence Cedex
Phone : (+33) 5 4000 24 87
Fax   : (+33) 5 4000 66 69
Web   : http://www.labri.fr/perso/solanki

* Please do not print this e-mail unless it's really necessary *
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[Buildroot] Buildroot networking problems

[Baruch Siach]

Hi Jigar,

On Tue, Feb 07, 2012 at 02:28:11PM +0100, Jigar SOLANKI wrote:
> Le 06/02/2012 21:37, Peter Korsgaard a ?crit :
> >>>>>> "Jigar" == Jigar SOLANKI <jigar.solanki@labri.fr> writes:
> > 
> >  Jigar> Hi all,
> >  Jigar> I've built a Buildroot Linux on a Leon3 CPU, everything works fine
> >  Jigar> except the network configuration.
> > 
> >  Jigar> I have the eth0 interface configured correctly with a default gw,
> >  Jigar> netmask etc...but when I ping the interface adress itself, it doesnt
> >  Jigar> respond at all.
> > 
> >  Jigar> I've also tried to ping 127.0.0.1, same result, lo is not responding.
> >  Jigar> (I have read some posts on resolv.conf but in my case, it is not a dns
> >  Jigar> related issue, I ping numerical adresses..)
> > 
> > Please provide some more info. Please paste output of ipconfig -a. What
> > kind of errors do you get?
>
> [detailed setup description]

Please send the output of 'iptables -L -n'.

baruch

-- 
     http://baruch.siach.name/blog/                  ~. .~   Tk Open Systems
=}------------------------------------------------ooO--U--Ooo------------{=
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[Buildroot] Buildroot networking problems

[Jigar SOLANKI]

> Please send the output of 'iptables -L -n'.

I tried with and without iptables support.

Here's the ouput with :
> # iptables -L -n
modprobe: chdir(/lib/modules): No such file or directory
iptables v1.4.10: can't initialize iptables table `filter': Table does
not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
#


> baruch
> 


-- 
Jigar SOLANKI

LaBRI - UMR 5800
Universit? Bordeaux 1
351 Cours de la Lib?ration
F-33405 Talence Cedex
Phone : (+33) 5 4000 24 87
Fax   : (+33) 5 4000 66 69
Web   : http://www.labri.fr/perso/solanki

* Please do not print this e-mail unless it's really necessary *
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[Buildroot] Buildroot networking problems

[Peter Korsgaard]

>>>>> "Jigar" == Jigar SOLANKI <jigar.solanki@labri.fr> writes:

Hi,

 >> Please provide some more info. Please paste output of ipconfig -a. What
 >> kind of errors do you get?

 Jigar> I do not have any errors. The ping just simply do not respond. The
 Jigar> packets are lost.

 Jigar> There are two interfaces eth0 and lo.

 Jigar> eth0 : 10.10.10.0/24  IP:10.10.10.1 Gw : 10.10.10.254

 Jigar> So, when I ping 10.10.10.254 from 10.10.10.1, I dont have any response :
 Jigar> the packets are lost, tcpdump on the gw (10.10.10.254) shows incoming
 Jigar> ICMP packets, though !

But no reply? If the packets are wellformed the gw should reply. Could
you show up the tcpdump output please?

-- 
Bye, Peter Korsgaard

[Buildroot] Buildroot networking problems

[Arnout Vandecappelle]

On Tuesday 07 February 2012 21:45:32 Peter Korsgaard wrote:
> >>>>> "Jigar" == Jigar SOLANKI <jigar.solanki@labri.fr> writes:
> 
> Hi,
> 
>  >> Please provide some more info. Please paste output of ipconfig -a. What
>  >> kind of errors do you get?
> 
>  Jigar> I do not have any errors. The ping just simply do not respond. The
>  Jigar> packets are lost.
> 
>  Jigar> There are two interfaces eth0 and lo.
> 
>  Jigar> eth0 : 10.10.10.0/24  IP:10.10.10.1 Gw : 10.10.10.254
> 
>  Jigar> So, when I ping 10.10.10.254 from 10.10.10.1, I dont have any response :
>  Jigar> the packets are lost, tcpdump on the gw (10.10.10.254) shows incoming
>  Jigar> ICMP packets, though !
> 
> But no reply? If the packets are wellformed the gw should reply. Could
> you show up the tcpdump output please?

 Maybe also a kernel defconfig?  'make linux-savedefconfig' and attach the 
output/linux-*/defconfig.

 Regards,
 Arnout

-- 
Arnout Vandecappelle                               arnout at mind be
Senior Embedded Software Architect                 +32-16-286540
Essensium/Mind                                     http://www.mind.be
G.Geenslaan 9, 3001 Leuven, Belgium                BE 872 984 063 RPR Leuven
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