[Bridge] Ubuntu: network bridging between wireless and wired connection fails
richardvoigt at gmail.com
richardvoigt at gmail.com
Tue Apr 28 16:00:23 PDT 2009
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
> 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 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> 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?
>>
>
>
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