Re: [Bridge] Ubuntu: network bridging between wireless and wired connection fails

[Jochen Hebbrecht <jochenhebbrecht@gmail.com>]

Nicolas de Pesloüan schreef:
> Ok, now we understand what you are trying to do. In particular, I 
> assume the DHCP server is on the subnet of location B (or behind a 
> router connected on this subnet), so the expected DHCP offer will come 
> from the wire interface (eth0) and definitely not from the wireless 
> interface (eth1).
>
Maybe my picture isn't very clear, but my WAN access is on location A. 
There's a router which receives an ip from the ISP. On the other side, 
I'm having a 192.168.1.0/24 network
> Let's try a step-by-step bridge configuration :
>
> 1/ Try to setup a non-bridge configuration and ensure you successfully 
> get a DHCP answer using eth0.
>
> auto eth0
> iface eth0 inet dhcp
>
> #auto eth1
> #iface eth1 inet dhcp
> #wpa-driver wext
> #wpa-ssid ##SSID##
> #wpa-ap-scan 1
> #wpa-proto RSN
> #wpa-pairwise CCMP
> #wpa-group CCMP
> #wpa-key-mgmt WPA-PSK
> #wpa-psk ##PSK KEY##
>
> #auto br0
> #iface br0 inet dhcp
> #bridge_ports eth0 eth1
I tried this:

$ cat /etc/network/interfaces
auto lo
iface lo inet loopback

auto eth1
iface eth1 inet dhcp
wpa-driver wext
wpa-ssid ##SSID##
wpa-ap-scan 1
wpa-proto RSN
wpa-pairwise CCMP
wpa-group CCMP
wpa-key-mgmt WPA-PSK
wpa-psk ##PSK KEY##

This configuration works fine. I'm receiving a DHCP offer from my router 
(in location A)
>
> 2/ Try to setup a bridge with only eth0 (wire interface) and ensure 
> this work well, using a static IP address.
>
> #auto eth0
> iface eth0 inet manual
>
> #auto eth1
> iface eth1 inet manual
>
> auto br0
> iface br0 inet static
> bridge_ports eth0
> address 192.168.1.111
> netmask 255.255.255.0
$ cat /etc/network/interfaces
auto lo
iface lo inet loopback

auto eth1
iface eth1 inet manual
wpa-driver wext
wpa-ssid ##SSID##
wpa-ap-scan 1
wpa-proto RSN
wpa-pairwise CCMP
wpa-group CCMP
wpa-key-mgmt WPA-PSK
wpa-psk ##PSK KEY##

auto br0
iface br0 inet static
bridge_ports eth1
address 192.168.1.111
netmask 255.255.255.0
gateway 192.168.1.1

 $ sudo /etc/init.d/networking restart
 * Reconfiguring network 
interfaces...                                         

Waiting for br0 to get ready (MAXWAIT is 32 seconds).
                                                                         
[ OK ]
$ route -n
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 br0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 br0
0.0.0.0         192.168.1.1     0.0.0.0         UG    100    0        0 br0

$ sudo brctl show br0
bridge name     bridge id               STP enabled     interfaces
br0             8000.0015001f20a6       no              eth1

$ ifconfig eth1
eth1      Link encap:Ethernet  HWaddr 00:15:00:1f:20:a6 
          inet6 addr: fe80::215:ff:fe1f:20a6/64 Scope:Link
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:7 errors:82 dropped:84 overruns:0 frame:0
          TX packets:1 errors:0 dropped:19 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1056452 (1.0 MB)  TX bytes:149964 (146.4 KB)
          Interrupt:21 Base address:0xa000 Memory:c8006000-c8006fff

$ ifconfig br0
br0       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:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:27 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:1350 (1.3 KB)

$ ping 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
 From 192.168.1.111 icmp_seq=2 Destination Host Unreachable
 From 192.168.1.111 icmp_seq=3 Destination Host Unreachable
 From 192.168.1.111 icmp_seq=5 Destination Host Unreachable
 From 192.168.1.111 icmp_seq=6 Destination Host Unreachable

So here it goes wrong. I didn't execute any other steps as step 2 fails 
:-( ...