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

["Nicolas de Pesloüan" <nicolas.2p.debian@free.fr>]

Jochen Hebbrecht a écrit :
> 
> 
> 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

I'm no more really sure I understand your configuration.

The server you are curently trying to setup as a bridge is located in 
location B (UBUNTU SERVER) and has two interfaces : eth0 (ethernet) and 
eth1 (wifi).

Am I right ?

>> 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 
> :-( ...
> 
>