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

Jochen Hebbrecht <jochenhebbrecht@xxxxxxxxx> · Tue, 28 Apr 2009 23:16:56 +0200

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@xxxxxxxxx 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@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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