sudo dhclient eth2  (or whatever is obviously the BBG from looking at 
ifconfig)

There is one line return and then nothing happens (after entering password 
due to sudo).

On a healthy board, at the first "sudo dhclient ethX", there is a quick 
line feed and no messages.
The second time, I get
RTNETLINK answers: File exists

On Monday, January 25, 2016 at 1:15:33 PM UTC-5, RobertCNelson wrote:
>
> On Mon, Jan 25, 2016 at 12:05 PM, Soapy Smith <[email protected] 
> <javascript:>> wrote: 
> > I've always seen marginal success in USB connectivity with BBB.  I 
> recently 
> > acquired a couple of BBG, at first I thought these were solid, but now I 
> am 
> > seeing problems. 
> > 
> > There is a difference seen in the host computer from the shell command 
> > ifconfig -a. 
> > Here is ifconfig -a for a working BBG: 
> > 
> > eth0      Link encap:Ethernet  HWaddr 6c:0b:84:09:f9:de 
> >           inet addr:192.168.1.4  Bcast:192.168.1.255  Mask:255.255.255.0 
> >           inet6 addr: fe80::6e0b:84ff:fe09:f9de/64 Scope:Link 
> >           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1 
> >           RX packets:982290 errors:0 dropped:0 overruns:0 frame:0 
> >           TX packets:613548 errors:0 dropped:0 overruns:0 carrier:0 
> >           collisions:0 txqueuelen:1000 
> >           RX bytes:1196203986 (1.1 GB)  TX bytes:107826806 (107.8 MB) 
> >           Interrupt:20 Memory:f7100000-f7120000 
> > 
> > eth1      Link encap:Ethernet  HWaddr ec:24:b8:f6:e1:7c 
> >           inet addr:192.168.7.1  Bcast:192.168.7.255  Mask:255.255.255.0 
> >           inet6 addr: fe80::ee24:b8ff:fef6:e17c/64 Scope:Link 
> >           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1 
> >           RX packets:64 errors:0 dropped:0 overruns:0 frame:0 
> >           TX packets:63 errors:0 dropped:0 overruns:0 carrier:0 
> >           collisions:0 txqueuelen:1000 
> >           RX bytes:10319 (10.3 KB)  TX bytes:15361 (15.3 KB) 
> > 
> > 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:65536  Metric:1 
> >           RX packets:30214 errors:0 dropped:0 overruns:0 frame:0 
> >           TX packets:30214 errors:0 dropped:0 overruns:0 carrier:0 
> >           collisions:0 txqueuelen:0 
> >           RX bytes:3210722 (3.2 MB)  TX bytes:3210722 (3.2 MB) 
> > 
> > Now here is a different BBG flashed with the exact same image Debian 
> 8.2: 
> > eth0      Link encap:Ethernet  HWaddr 6c:0b:84:09:f9:de 
> >           inet addr:192.168.1.4  Bcast:192.168.1.255  Mask:255.255.255.0 
> >           inet6 addr: fe80::6e0b:84ff:fe09:f9de/64 Scope:Link 
> >           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1 
> >           RX packets:982671 errors:0 dropped:0 overruns:0 frame:0 
> >           TX packets:613978 errors:0 dropped:0 overruns:0 carrier:0 
> >           collisions:0 txqueuelen:1000 
> >           RX bytes:1196254756 (1.1 GB)  TX bytes:107922637 (107.9 MB) 
> >           Interrupt:20 Memory:f7100000-f7120000 
> > 
> > eth4      Link encap:Ethernet  HWaddr 68:c9:0b:ed:25:23 
> >           inet6 addr: fe80::6ac9:bff:feed:2523/64 Scope:Link 
> >           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1 
> >           RX packets:42 errors:0 dropped:0 overruns:0 frame:0 
> >           TX packets:52 errors:0 dropped:0 overruns:0 carrier:0 
> >           collisions:0 txqueuelen:1000 
> >           RX bytes:6487 (6.4 KB)  TX bytes:12510 (12.5 KB) 
> > 
> > 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:65536  Metric:1 
> >           RX packets:30316 errors:0 dropped:0 overruns:0 frame:0 
> >           TX packets:30316 errors:0 dropped:0 overruns:0 carrier:0 
> >           collisions:0 txqueuelen:0 
> >           RX bytes:3218638 (3.2 MB)  TX bytes:3218638 (3.2 MB) 
> > 
> > The obvious difference is seen at eth4 for the non-working versus eth1 
> for 
> > the working board. 
> > eth1 (the working board) is getting an inet address. 
> > eth4 (the non-working board) is not getting an inet address. 
>
> how about "sudo dhclient eth4" ? 
>
> ps.. the "eth1" vs "eth4" is a udev issue that "you" need to fix on your 
> host*.. 
>
> The BBG (on the other end of the usb cable) can't tell your host how 
> to name it. (ethX).. 
>
> * /etc/udev/rules.d/70-persistent-net.rules 
>
> So your first BBG will get eth1, second eth2, third eth3, etc... 
>
> Regards, 
>
> -- 
> Robert Nelson 
> https://rcn-ee.com/ 
>

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