I've recently installed Ubuntu 13.04 on the Beagle Bone Black. This image:
https://rcn-ee.net/deb/flasher/raring/BBB-eMMC-flasher-ubuntu-13.04-2013-10-08.img.xz
This microcontroller allows to share internet connection between host PC (Version 12.04 (precise) (64-Bit), Kernel Linux 3.2.0-56-generic) and BeagleBone over USB, so I went for it and configured the device as follows:
BeagleBone Black:
ifconfig usb0 192.168.7.2
route add default gw 192.168.7.1
Host PC:
sudo su
#eth0 is my internet facing interface, eth3 is the BeagleBone USB connection
ifconfig eth2 192.168.7.1
iptables --table nat --append POSTROUTING --out-interface eth0 -j MASQUERADE
iptables --append FORWARD --in-interface eth2 -j ACCEPT
echo 1 > /proc/sys/net/ipv4/ip_forward
After that Internet Connection works itself, when I do ping 8.8.8.8 I get the results:
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_req=1 ttl=47 time=4.63 ms
64 bytes from 8.8.8.8: icmp_req=2 ttl=47 time=4.68 ms
64 bytes from 8.8.8.8: icmp_req=3 ttl=47 time=4.57 ms
64 bytes from 8.8.8.8: icmp_req=4 ttl=47 time=4.58 ms
^C
--- 8.8.8.8 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3005ms
rtt min/avg/max/mdev = 4.578/4.620/4.682/0.063 ms
To have DNS configured too I typed aswell echo "nameserver 8.8.8.8" >> /etc/resolv.conf but unfortunately when I do ping google.com I get, after few seconds of computing, ping: unknown host google.com
So – I know, that this solution isn't good, but for this session it could work and it doesn't. What's more, both – BBB and PC – use resolvconf. To be honest I've got no clue how to configure network using this program… I tried changing /etc/network/interfaces on Beagle Bone Black like this:
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
#auto eth0
iface eth0 inet dhcp
# Example to keep MAC address between reboots
#hwaddress ether DE:AD:BE:EF:CA:FE
# WiFi Example
#auto wlan0
#iface wlan0 inet dhcp
# wpa-ssid "essid"
# wpa-psk "password"
# Ethernet/RNDIS gadget (g_ether)
# ... or on host side, usbnet and random hwaddr
# Note on some boards, usb0 is automaticly setup with an init script
# in that case, to completely disable remove file [run_boot-scripts] from the boot partition
auto usb0
iface usb0 inet static
address 192.168.7.2
netmask 255.255.252.0
network 192.168.7.0
#broadcast 192.168.7.3
gateway 192.168.7.1
dns-nameservers 8.8.8.8 8.8.4.4
but it didn't help.
I don't know what else should I do. Please help.
Additional useful infos:
Beagle Bone Black:
ifconfig
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: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)
usb0 Link encap:Ethernet HWaddr ce:39:f3:4a:c7:94
inet addr:192.168.7.2 Bcast:192.168.7.3 Mask:255.255.255.252
inet6 addr: fe80::cc39:f3ff:fe4a:c794/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:608 errors:0 dropped:0 overruns:0 frame:0
TX packets:375 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:57484 (57.4 KB) TX bytes:63078 (63.0 KB)
route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 192.168.7.1 0.0.0.0 UG 0 0 0 usb0
192.168.7.0 * 255.255.255.252 U 0 0 0 usb0
uname -a
Linux arm 3.8.13-bone28 #1 SMP Fri Sep 13 03:12:24 UTC 2013 armv7l armv7l armv7l GNU/Linux
/etc/resolv.conf
nameserver 8.8.8.8
nameserver 8.8.4.4
#domain localdomain
#search localdomain
#nameserver 192.168.1.1
PC:
ifconfig
eth0 Link encap:Ethernet Hardware Adresse 00:17:31:8d:6a:a6
inet Adresse:141.3.81.154 Bcast:141.3.83.255 Maske:255.255.252.0
inet6-Adresse: fe80::217:31ff:fe8d:6aa6/64 Gültigkeitsbereich:Verbindung
UP BROADCAST RUNNING MULTICAST MTU:1500 Metrik:1
RX packets:30732 errors:0 dropped:0 overruns:0 frame:0
TX packets:5888 errors:0 dropped:0 overruns:0 carrier:0
Kollisionen:0 Sendewarteschlangenlänge:1000
RX-Bytes:7266589 (7.2 MB) TX-Bytes:1286462 (1.2 MB)
Interrupt:19
eth1 Link encap:Ethernet Hardware Adresse 00:04:75:ca:98:ee
UP BROADCAST MULTICAST MTU:1500 Metrik:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
Kollisionen:0 Sendewarteschlangenlänge:1000
RX-Bytes:0 (0.0 B) TX-Bytes:0 (0.0 B)
Interrupt:21 Basisadresse:0xe400
eth2 Link encap:Ethernet Hardware Adresse c8:a0:30:ac:2c:95
inet Adresse:192.168.7.1 Bcast:192.168.7.3 Maske:255.255.255.252
inet6-Adresse: fe80::caa0:30ff:feac:2c95/64 Gültigkeitsbereich:Verbindung
UP BROADCAST RUNNING MULTICAST MTU:1500 Metrik:1
RX packets:418 errors:0 dropped:0 overruns:0 frame:0
TX packets:637 errors:0 dropped:0 overruns:0 carrier:0
Kollisionen:0 Sendewarteschlangenlänge:1000
RX-Bytes:45704 (45.7 KB) TX-Bytes:88161 (88.1 KB)
lo Link encap:Lokale Schleife
inet Adresse:127.0.0.1 Maske:255.0.0.0
inet6-Adresse: ::1/128 Gültigkeitsbereich:Maschine
UP LOOPBACK RUNNING MTU:16436 Metrik:1
RX packets:840 errors:0 dropped:0 overruns:0 frame:0
TX packets:840 errors:0 dropped:0 overruns:0 carrier:0
Kollisionen:0 Sendewarteschlangenlänge:0
RX-Bytes:142988 (142.9 KB) TX-Bytes:142988 (142.9 KB)
route
Ziel Router Genmask Flags Metric Ref Use Iface
default i60-gw-int.ipr. 0.0.0.0 UG 0 0 0 eth0
141.3.80.0 * 255.255.252.0 U 1 0 0 eth0
link-local * 255.255.0.0 U 1000 0 0 eth2
192.168.7.0 * 255.255.255.252 U 1 0 0 eth2
uname -a
Linux i60p354 3.2.0-56-generic #86-Ubuntu SMP Wed Oct 23 09:20:45 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
What can be important – PC, which share Internet with BBB works in the University network, which is far more complicated than normal home network – could that cause problems with DNS resolving? Whats important yet – if I set a nameserver that makes sense in resolv.conf.d/head (which is simply up and running like 8.8.8.8) and type ping google.com the maschine computes for some time and than returns error unknown host. If I set a nonsense adress, which surely doesn't work (ie 123.123.123.123) error is being returned immediately.
Best Answer
I got this working by adding the interface on my host (Fedora 20) to the trusted zone. I'm embarrassed to say I don't know what this really does though. I looked at the raw IP tables output and didn't see any mention of this interface, only some chains by zone. Anyway, check out your host and see what could be preventing IP forwarding. I'm guessing ping works because the defaults are more relaxed for ICMP traffic. Also, I think you have one typo in the above, the netmask for usb0 should be 255.255.255.252. Thank you for posting what you did, this would have been way more painful without it.