Re: Ubuntu: network bridging between wireless and wired connection fails

["richardvoigt@xxxxxxxxx" <richardvoigt@xxxxxxxxx>]

Do some packet monitoring on your wireless network to see if the DHCP request is going out over the air... your problems stem from not getting a DHCP address.  At first I thought the address given to eth1 might be interfering with br0... but it seems not.

On Tue, Apr 28, 2009 at 12:36 PM, Jochen Hebbrecht <jochenhebbrecht@xxxxxxxxx> wrote:

Ross Vandegrift schreef:

On Tue, Apr 28, 2009 at 02:52:10PM +0200, Jochen Hebbrecht wrote:
 

Okay, thnx!
Just a small question, I think I need to configure eth0 and eth1 to
manual? And not to DHCP?

Like this:
----------------------------------------
auto eth0
iface eth0 inet manual

auto eth1
iface eth1 inet manual
----------------------------------------
   

Ah - I missed that.  Yes, you definitely want to set the member
interfaces to manual.
   

The thing I don't understand then: if you execute a dhclient on br0,
how does br0 know the configuration of eth1? Because there's a WPA2
configuration on it. Will it use that settings too while bridging?
   

I'll be honest, I'm not sure - I've never done that with
wpa_supplicant and the debian tools.  You might need to activate
wpa_supplicant in the pre-up for br0.

Check out the manpage for interfaces - it may have more details.
 

Ok, I made it myself a little easier by temporarly switching from WPA2 to unsecure wireless networking.

I'm having the following configuration:

Code:

to lo
iface lo inet loopback

auto eth0
iface eth0 inet manual

auto eth1
iface eth1 inet manual

wireless-essid ##MY-ESSID##
wireless-mode managed

auto br0

iface br0 inet dhcp
bridge_ports eth0, eth1

When I reboot, my interfaces are getting the following config:

Code:

br0       Link encap:Ethernet  HWaddr 00:0a:e4:ae:7e:4c           inet6 addr: fe80::20a:e4ff:feae:7e4c/64 Scope:Link
        UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

        RX packets:87 errors:0 dropped:0 overruns:0 frame:0
        TX packets:23 errors:0 dropped:0 overruns:0 carrier:0
        collisions:0 txqueuelen:0         RX bytes:17544 (17.1 KB)  TX bytes:3744 (3.6 KB)

br0:avahi Link encap:Ethernet  HWaddr 00:0a:e4:ae:7e:4c           inet addr:169.254.7.81  Bcast:169.254.255.255  Mask:255.255.0.0
        UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

eth0      Link encap:Ethernet  HWaddr 00:0a:e4:ae:7e:4c           inet6 addr: fe80::20a:e4ff:feae:7e4c/64 Scope:Link
        UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

        RX packets:3 errors:0 dropped:0 overruns:0 frame:0
        TX packets:89 errors:0 dropped:0 overruns:0 carrier:0
        collisions:0 txqueuelen:1000         RX bytes:1770 (1.7 KB)  TX bytes:23069 (22.5 KB)

        Interrupt:20 Base address:0xc000

eth1      Link encap:Ethernet  HWaddr 00:15:00:1f:20:a6           inet addr:192.168.1.111  Bcast:192.168.1.255  Mask:255.255.255.0

        inet6 addr: fe80::215:ff:fe1f:20a6/64 Scope:Link
        UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

        RX packets:223 errors:0 dropped:0 overruns:0 frame:0
        TX packets:99 errors:0 dropped:0 overruns:0 carrier:0
        collisions:0 txqueuelen:1000         RX bytes:18762 (18.3 KB)  TX bytes:8392 (8.1 KB)
        Interrupt:21 Base address:0xa000 Memory:c8006000-c8006fff

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:1879 errors:0 dropped:0 overruns:0 frame:0
        TX packets:1879 errors:0 dropped:0 overruns:0 carrier:0
        collisions:0 txqueuelen:0         RX bytes:94956 (92.7 KB)  TX bytes:94956 (92.7 KB

The bridge looks ok:

Code:

jochus@Bacardi ~ $ sudo brctl show br0
[sudo] password for jochus: bridge name     bridge id               STP enabled     interfaces
br0             8000.000ae4ae7e4c       no              eth0
                                                      eth1

My routing table looks like this:

Code:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth1

169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0 br0

0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 eth1
0.0.0.0         0.0.0.0         0.0.0.0         U     1000   0        0 br0

But I'm not able to ping my router ...

Code:

PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
>From 192.168.1.111 icmp_seq=1 Destination Host Unreachable
>From 192.168.1.111 icmp_seq=2 Destination Host Unreachable
>From 192.168.1.111 icmp_seq=3 Destination Host Unreachable

--- 192.168.1.1 ping statistics ---
5 packets transmitted, 0 received, +3 errors, 100% packet loss, time 4018ms

I don't understand why eth1 is in my routing table. It shouldn't be I guess?
Anybody some idea's?

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