Simple networking help for Linux

**Bugbyte** · 08-31-2010, 01:03 PM

I just got a new embedded Linux board, the igepv2. It comes with Poky Linux and I'm trying to get it online but can't figure out what the problem is. Right now it is plugged into my router via ethernet cable but won't show up as an attached device.

I'm able to iwconfig and iwlist and the if config reports:

Code:

eth0  Link encap:Ethernet  HWaddr 76:09:B3:FF:F5:05
        inet addr: 192.168.1.100  Bcast:192.168.1.255 Mask:255.255.255.0
        inet6 addr: fe80::7409:b3ff:feff:f505/64 Scope:Link
        UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
        RX packets:0 errors:0 dropped:0 overruns:0 frame:0
        TX packets: 176 errors:0 dropped:0 overruns:0 carrier:0
        collisions:0 txqueuelan:1000
        RX bytes:0 (0.0 B)   TX bytes:17831  (17.4KiB)
        Interrupt: 80

I was able to set the IP address to the 192.168.1.100 and it took it just fine. I can actually ping 192.168.1.255 and get a response. But when I try to ping one of my home pc's FROM the igep terminal, I get nothing. It sends the ping and then waits.

The web browser built into Poky won't connect to anything either.

If I enter:

ifup eth0 <--the ethernet device, then I get:

udhcpc (v1.9.1) started
Sending discover...
Sending discover...
Sending discover...
No lease, failing

Any help is appreciated!

**Bugbyte** · 08-31-2010, 04:46 PM

Edit - I've been trying to add my default gateway as I think that might be the problem but I haven't been able to. Here is my netstat -nr output:

Code:

Kernel IP routing table
Destination      Gateway           Genmask         Flags    MSS Window  irtt Iface
192.168.254.0  0.0.0.0             255.255.255.0   U             0  0             0 eth0
0.0.0.0        192.168.254.19      0.0.0.0            UG           0  0             0 eth0

route add default fw 192.168.1.1 eth0
route SIOCADDRT: Network is unreachable

**tripzero** · 08-31-2010, 05:05 PM

I wouldn't mess too much with the stock poky.

**nasa** · 08-31-2010, 06:34 PM

Bugbyte,

Why did you *set* the ip address? Doesn't poky support dhcp? I would reboot the machine and then try 'dhclient' from a command line and see what happens...

edit:

NM -- just noted it uses udhcpc.... did you set an ip address prior to the 'ifup' command? And is your subnet '1' or '0' ?

**kraft** · 09-01-2010, 01:40 PM

Didin't messed with poky but

- Check if any firewall service is started like iptables or shorewall
- Check the content of the files /etc/hosts.allow and btw the content of hosts.deny if they are present in the directory /etc/

you could take a look in some log files like tail -f /var/log/messages or eventually dmesg.

**sikryd** · 09-01-2010, 01:53 PM

Originally Posted by Bugbyte

Edit - I've been trying to add my default gateway as I think that might be the problem but I haven't been able to. Here is my netstat -nr output:

Code:

Kernel IP routing table
Destination      Gateway           Genmask         Flags    MSS Window  irtt Iface
192.168.254.0  0.0.0.0             255.255.255.0   U             0  0             0 eth0
0.0.0.0        192.168.254.19      0.0.0.0            UG           0  0             0 eth0

route add default fw 192.168.1.1 eth0
route SIOCADDRT: Network is unreachable

Edit your /etc/sysconfig/network file with the default gateway

**Bugbyte** · 09-01-2010, 03:31 PM

Thanks for the tips. No joy on any of them.

I think it is a gateway problem, too but there is no /etc/sysconfig directory. I tried to set the default gateway using a command I can't recall, but it did not help.

**gregsuko** · 09-01-2010, 04:01 PM

Originally Posted by Bugbyte

Edit - I've been trying to add my default gateway as I think that might be the problem but I haven't been able to. Here is my netstat -nr output:

Code:

Kernel IP routing table
Destination      Gateway           Genmask         Flags    MSS Window  irtt Iface
192.168.254.0  0.0.0.0             255.255.255.0   U             0  0             0 eth0
0.0.0.0        192.168.254.19      0.0.0.0            UG           0  0             0 eth0

route add default fw 192.168.1.1 eth0
route SIOCADDRT: Network is unreachable

The above command should probably be
route add default gw 192.168.1.1 eth0

not: route add default fw 192.168.1.1 eth0 (gw for gateway instead of fw)