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

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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@xxxxxxxxx> 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@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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