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白い熊 is offline 白い熊
2010-03-11 , 15:47
Posts: 451 | Thanked: 334 times | Joined on Sep 2009
#1
I'm goin' nuts, have been messing with this for hours now, and though I think it's something stupid, can't figure out what I've messed up...

I just wanna achieve the following: my Debian PC is connected to the internet over a Wifi connection. Wanna plug in the N900 with the USB cable and ssh access it.

Had it working easily, don't know what's changed.

Basically now, as per:
http://wiki.maemo.org/N900_USB_networking
http://wiki.maemo.org/USB_networking..._Configuration
and
http://pc-connectivity.garage.maemo....00000000000000

I've added to /etc/network/interfaces on the PC:
Code:
auto usb0
allow-hotplug usb0

mapping hotplug
script grep
map usb0

iface usb0 inet static
   up iptables -t nat -A POSTROUTING -s 192.168.2.15 -j MASQUERADE
   up echo 1 > /proc/sys/net/ipv4/ip_forward
   down iptables -t nat -D POSTROUTING -s 192.168.2.15 -j MASQUERADE
   down echo 0 > /proc/sys/net/ipv4/ip_forward
Now, when I plug in the USB cable, ifconfig gives me for USB:
Code:
usb0      Link encap:Ethernet  HWaddr 12:5e:6e:98:55:a5  
          inet6 addr: fe80::105e:6eff:fe98:55a5/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:21 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:3525 (3.4 KiB)
and I can ping google.com no prob. Can't ping 192.168.2.15

The moment I run
Code:
# ifconfig usb0 192.168.2.14
I can ping 192.168.2.15 but pinging google.com gives me, after a couple of secs wait:
Code:
ping: unknown host google.com
After unplugging the USB, all goes back to normal.

WTF? What am I missing?
 
白い熊 is offline 白い熊
2010-03-11 , 16:47
Posts: 451 | Thanked: 334 times | Joined on Sep 2009
#2
Duh... DNS problems.

Adding public DNS servers to /etc/resolv.conf fixes the issue.

Don't know why ifconfig usb0 messes up with DNS resolution on the wifi, but WTH it works now...
 
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