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

Ross Vandegrift ross at kallisti.us
Wed Apr 29 09:26:51 PDT 2009


On Wed, Apr 29, 2009 at 06:16:14PM +0200, Jochen Hebbrecht wrote:
> No, the DHCP server gives addresses to every MAC address that is possible.

Is eth0 plugged in?  Does it work if you statically assign an IP to br0?

Ross


> 
> So this is the current situation:
> 
> jochus at Bacardi ~ $ sudo brctl show br0
> bridge name     bridge id               STP enabled     interfaces
> br0             8000.000ae4ae7e4c       no              eth0
>                                                                           
> eth1
> 
> jochus at Bacardi ~ $ route -n
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags     Metric Ref    
> Use Iface
> 169.254.0.0     0.0.0.0         255.255.0.0     U     0         0       
>        0  br0
> 0.0.0.0             0.0.0.0             0.0.0.0         U     1000   
> 0               0  br0
> 
> 
> I also found this thread: 
> http://www.linuxquestions.org/questions/debian-26/howto-bridge-wireless-and-wired-network-interfaces-369455/, 
> but that solution didn't work either. I'm not receiving any DHCP offers on 
> eth1
> 
> I guess I'm stuck with it, and returning to windows is the best solution 
> now :-)
> 
> 
> 
> richardvoigt at gmail.com schreef:
> >Does your DHCP server only give out addresses to specific MAC 
> >addresses?  Turning on bridge mode probably results in using the MAC 
> >address of eth0, rather than eth1 which had been successfully getting 
> >a DHCP assignment?
> >
> >I had actually meant for you to run packet capture from some other 
> >node on the wireless, to make sure the DHCP discover actually went out 
> >the radio.  But you clearly are joined properly.
> >
> >So check for any sort of MAC-based security in the DHCP server.
> >
> >On Tue, Apr 28, 2009 at 4:16 PM, Jochen Hebbrecht 
> ><jochenhebbrecht at gmail.com <mailto:jochenhebbrecht at gmail.com>> wrote:
> >
> >    Richard,
> >
> >    After rebooting a second time, eth1 isn't appearing in the routing
> >    tabel any longer. The bridge seems to be working perfectly now!
> >    However, I'm not able to retreive any DHCP offers.
> >
> >    I did some packet monitoring:
> >
> >    br0
> >
> >    1	0.000000000	fe80::20a:e4ff:feae:7e4c	ff02::2	ICMPv6 
> >    Router solicitation
> >    2	24.824098000	0.0.0.0	255.255.255.255	DHCP	DHCP Discover - 
> >    Transaction ID 0xa117a72
> >    3	28.824043000	0.0.0.0	255.255.255.255	DHCP	DHCP Discover - 
> >    Transaction ID 0xa117a72
> >    4	33.685106000	192.168.1.1	239.255.255.250	SSDP	NOTIFY * 
> >    HTTP/1.1  5	33.688946000	192.168.1.1	239.255.255.250	SSDP 
> >    NOTIFY * HTTP/1.1  6	33.692700000	192.168.1.1 239.255.255.250 
> >    SSDP	NOTIFY * HTTP/1.1  7	33.698081000	192.168.1.1 
> >    239.255.255.250	SSDP	NOTIFY * HTTP/1.1  8	33.701656000 
> >    192.168.1.1	239.255.255.250	SSDP	NOTIFY * HTTP/1.1  9 
> >    33.705492000	192.168.1.1	239.255.255.250	SSDP	NOTIFY * 
> >    HTTP/1.1  10	33.708885000	192.168.1.1	239.255.255.250	SSDP 
> >    NOTIFY * HTTP/1.1  11	33.712502000	192.168.1.1 239.255.255.250 
> >    SSDP	NOTIFY * HTTP/1.1  12	33.716242000	192.168.1.1 
> >    239.255.255.250	SSDP	NOTIFY * HTTP/1.1  13	33.719929000 
> >    192.168.1.1	239.255.255.250	SSDP	NOTIFY * HTTP/1.1  14 
> >    38.824050000	0.0.0.0	255.255.255.255	DHCP	DHCP Discover - 
> >    Transaction ID 0xa117a72
> >    15	48.824039000	0.0.0.0	255.255.255.255	DHCP	DHCP 
> >    Discover - Transaction ID 0xa117a72
> >    16	56.768033000	Wistron_ae:7e:4c	Broadcast	ARP 
> >    Who has 169.254.7.81?  Tell 0.0.0.0
> >    17	57.992048000	Wistron_ae:7e:4c	Broadcast	ARP 
> >    Who has 169.254.7.81?  Tell 0.0.0.0
> >    18	59.019954000	Wistron_ae:7e:4c	Broadcast	ARP 
> >    Who has 169.254.7.81?  Tell 0.0.0.0
> >    19	61.020124000	Wistron_ae:7e:4c	Broadcast	ARP 
> >    Gratuitous ARP for 169.254.7.81 (Request)
> >    20	62.004532000	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB BACARDI<20>
> >    21	62.004582000	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB BACARDI<03>
> >    22	62.004615000	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB BACARDI<00>
> >    23	62.004647000	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB MSHOME<00>
> >    24	62.004679000	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB MSHOME<1e>
> >    25	62.004775000	169.254.7.81	169.254.255.255	BROWSER	Host 
> >    Announcement BACARDI, Workstation, Server, Print Queue Server, Xenix 
> >    Server, NT Workstation, NT Server, Potential Browser, Unknown server 
> >    type:23
> >    26	63.023921000	Wistron_ae:7e:4c	Broadcast	ARP 
> >    Gratuitous ARP for 169.254.7.81 (Request)
> >    27	64.003996000	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB BACARDI<20>
> >    28	64.004033000	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB BACARDI<03>
> >    29	64.004054000	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB BACARDI<00>
> >    30	64.004075000	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB MSHOME<00>
> >    31	64.004097000	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB MSHOME<1e>
> >    32	64.004156000	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB BACARDI<20>
> >    33	64.004179000	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB BACARDI<03>
> >    34	64.004200000	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB BACARDI<00>
> >    35	64.004220000	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB MSHOME<00>
> >    36	64.004240000	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB MSHOME<1e>
> >    37	65.127895000	Wistron_ae:7e:4c	Broadcast	ARP 
> >    Who has 195.130.129.165?  Tell 169.254.7.81
> >    38	66.004121000	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB BACARDI<20>
> >    39	66.004177000	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB BACARDI<03>
> >    40	66.004197000	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB BACARDI<00>
> >    41	66.004219000	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB MSHOME<00>
> >    42	66.004239000	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB MSHOME<1e>
> >    43	66.127931000	Wistron_ae:7e:4c	Broadcast	ARP 
> >    Who has 195.130.129.165?  Tell 169.254.7.81
> >    44	67.127989000	Wistron_ae:7e:4c	Broadcast	ARP 
> >    Who has 195.130.129.165?  Tell 169.254.7.81
> >    45	70.127967000	Wistron_ae:7e:4c	Broadcast	ARP 
> >    Who has 195.130.130.165?  Tell 169.254.7.81
> >    46	71.128025000	Wistron_ae:7e:4c	Broadcast	ARP 
> >    Who has 195.130.130.165?  Tell 169.254.7.81
> >        
> >
> >
> >
> >    eth0
> >
> >    1	0.000000	Wistron_ae:7e:4c	Broadcast	ARP	Who 
> >    has 192.168.1.1?  Tell 192.168.1.112
> >    2	19.840146	0.0.0.0	255.255.255.255	DHCP	DHCP Discover - 
> >    Transaction ID 0x8537ad48
> >    3	24.840168	0.0.0.0	255.255.255.255	DHCP	DHCP Discover - 
> >    Transaction ID 0x8537ad48
> >    4	38.840099	0.0.0.0	255.255.255.255	DHCP	DHCP Discover - 
> >    Transaction ID 0x8537ad48
> >    5	45.513321	192.168.1.1	239.255.255.250	SSDP	NOTIFY * 
> >    HTTP/1.1  6	45.516537	192.168.1.1	239.255.255.250	SSDP 
> >    NOTIFY * HTTP/1.1  7	45.520384	192.168.1.1 239.255.255.250 
> >    SSDP	NOTIFY * HTTP/1.1  8	45.524058	192.168.1.1 
> >    239.255.255.250	SSDP	NOTIFY * HTTP/1.1  9	45.527325 
> >    192.168.1.1	239.255.255.250	SSDP	NOTIFY * HTTP/1.1  10 
> >    45.530872	192.168.1.1	239.255.255.250	SSDP	NOTIFY * HTTP/1.1  
> >    11	45.534676	192.168.1.1	239.255.255.250	SSDP NOTIFY 
> >    * HTTP/1.1  12	45.538019	192.168.1.1	239.255.255.250	SSDP 
> >    NOTIFY * HTTP/1.1  13	45.541774	192.168.1.1 239.255.255.250 
> >    SSDP	NOTIFY * HTTP/1.1  14	45.545417	192.168.1.1 
> >    239.255.255.250	SSDP	NOTIFY * HTTP/1.1  15	45.549231 
> >    192.168.1.1	239.255.255.250	SSDP	NOTIFY * HTTP/1.1  16 
> >    51.412036	Wistron_ae:7e:4c	Broadcast	ARP	Who has 
> >    169.254.7.81?  Tell 0.0.0.0
> >    17	53.360036	Wistron_ae:7e:4c	Broadcast	ARP 
> >    Who has 169.254.7.81?  Tell 0.0.0.0
> >    18	54.716034	Wistron_ae:7e:4c	Broadcast	ARP 
> >    Who has 169.254.7.81?  Tell 0.0.0.0
> >    19	56.716135	Wistron_ae:7e:4c	Broadcast	ARP 
> >    Gratuitous ARP for 169.254.7.81 (Request)
> >    20	58.716070	Wistron_ae:7e:4c	Broadcast	ARP 
> >    Gratuitous ARP for 169.254.7.81 (Request)
> >    21	60.775980	Wistron_ae:7e:4c	Broadcast	ARP 
> >    Who has 195.130.129.165?  Tell 169.254.7.81
> >
> >
> >
> >    eth1
> >
> >    1	0.000000	fe80::215:ff:fe1f:20a6	ff02::2	ICMPv6	Router 
> >    solicitation
> >    2	25.983879	0.0.0.0	255.255.255.255	DHCP	DHCP Discover - 
> >    Transaction ID 0xe2640e1c
> >    3	30.983864	0.0.0.0	255.255.255.255	DHCP	DHCP Discover - 
> >    Transaction ID 0xe2640e1c
> >    4	32.949057	192.168.1.1	239.255.255.250	SSDP	NOTIFY * 
> >    HTTP/1.1  5	32.952404	192.168.1.1	239.255.255.250	SSDP 
> >    NOTIFY * HTTP/1.1  6	32.957215	192.168.1.1 239.255.255.250 
> >    SSDP	NOTIFY * HTTP/1.1  7	32.960893	192.168.1.1 
> >    239.255.255.250	SSDP	NOTIFY * HTTP/1.1  8	32.964222 
> >    192.168.1.1	239.255.255.250	SSDP	NOTIFY * HTTP/1.1  9 
> >    32.970023	192.168.1.1	239.255.255.250	SSDP	NOTIFY * HTTP/1.1  
> >    10	32.973868	192.168.1.1	239.255.255.250	SSDP NOTIFY 
> >    * HTTP/1.1  11	32.977056	192.168.1.1	239.255.255.250	SSDP 
> >    NOTIFY * HTTP/1.1  12	32.981455	192.168.1.1 239.255.255.250 
> >    SSDP	NOTIFY * HTTP/1.1  13	32.985056	192.168.1.1 
> >    239.255.255.250	SSDP	NOTIFY * HTTP/1.1  14	32.988717 
> >    192.168.1.1	239.255.255.250	SSDP	NOTIFY * HTTP/1.1  15 
> >    44.983895	0.0.0.0	255.255.255.255	DHCP	DHCP Discover - Transaction 
> >    ID 0xe2640e1c
> >    16	54.983846	0.0.0.0	255.255.255.255	DHCP	DHCP 
> >    Discover - Transaction ID 0xe2640e1c
> >    17	57.199856	Wistron_ae:7e:4c	Broadcast	ARP 
> >    Who has 169.254.7.81?  Tell 0.0.0.0
> >    18	58.967801	Wistron_ae:7e:4c	Broadcast	ARP 
> >    Who has 169.254.7.81?  Tell 0.0.0.0
> >    19	60.039785	Wistron_ae:7e:4c	Broadcast	ARP 
> >    Who has 169.254.7.81?  Tell 0.0.0.0
> >    20	62.039897	Wistron_ae:7e:4c	Broadcast	ARP 
> >    Gratuitous ARP for 169.254.7.81 (Request)
> >    21	64.039860	Wistron_ae:7e:4c	Broadcast	ARP 
> >    Gratuitous ARP for 169.254.7.81 (Request)
> >    22	66.107737	Wistron_ae:7e:4c	Broadcast	ARP 
> >    Who has 195.130.129.165?  Tell 169.254.7.81
> >    23	66.164183	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB BACARDI<20>
> >    24	66.164203	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB BACARDI<03>
> >    25	66.164222	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB BACARDI<00>
> >    26	66.164241	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB MSHOME<00>
> >    27	66.164258	169.254.7.81	169.254.255.255	NBNS 
> >    Registration NB MSHOME<1e>
> >    28	66.164314	169.254.7.81	169.254.255.255	BROWSER	Host 
> >    Announcement BACARDI, Workstation, Server, Print Queue Server, Xenix 
> >    Server, NT Workstation, NT Server, Potential Browser, Unknown server 
> >    type:23
> >
> >
> >
> >    You can see the DHCP discovers, but nobody's answering
> >
> >
> >
> >    richardvoigt at gmail.com <mailto:richardvoigt at gmail.com> schreef:
> >>    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 at gmail.com <mailto:jochenhebbrecht at gmail.com>> 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 at 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?
> >>
> >>
> >

-- 
Ross Vandegrift
ross at kallisti.us

"If the fight gets hot, the songs get hotter.  If the going gets tough,
the songs get tougher."
	--Woody Guthrie


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