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Old 10-22-2008, 02:04 PM   #1
Registered: Aug 2005
Location: Slovenia
Distribution: Fedora, Ubuntu
Posts: 69

Rep: Reputation: 15
Problems when bridging wireless and wired networks

I'm trying to bridge two network interfaces on Linux OS (Linux router box in network topology). I have weird problems. When I create a bridge and look for what MAC addresses have my bridge learned, everything looks ok, but if I check and ARP table there are some weird things with incomplete HW address resolutions. When trying to build and delete a bridge many times this happened for addresses on one network or the other (not just for the wireless part). Here is my network topology

Printouts on Linux router

lo        no wireless extensions.

eth0      no wireless extensions.

eth1      no wireless extensions.

wifi0     no wireless extensions.

most      no wireless extensions.

ath0      IEEE 802.11g  ESSID:"SpeedTouch915203"  Nickname:""
          Mode:Managed  Frequency:2.412 GHz  Access Point: 00:1D:68:F5:27:9D   
          Bit Rate:36 Mb/s   Tx-Power:16 dBm   Sensitivity=0/3  
          Retry:off   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality=37/94  Signal level=-55 dBm  Noise level=-92 dBm
          Rx invalid nwid:43  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0
ath0      Link encap:Ethernet  HWaddr 00:19:E0:8A:F3:9D  
          inet6 addr: fe80::219:e0ff:fe8a:f39d/64 Scope:Link
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:473 errors:0 dropped:0 overruns:0 frame:0
          TX packets:26 errors:16 dropped:16 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:40825 (39.8 KiB)  TX bytes:4414 (4.3 KiB)

eth0      Link encap:Ethernet  HWaddr 00:10:5A:C4:43:75  
          inet6 addr: fe80::210:5aff:fec4:4375/64 Scope:Link
          RX packets:1587 errors:0 dropped:0 overruns:0 frame:0
          TX packets:291 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:178591 (174.4 KiB)  TX bytes:31278 (30.5 KiB)
          Interrupt:10 Base address:0x400 

lo        Link encap:Local Loopback  
          inet addr:  Mask:
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:750 errors:0 dropped:0 overruns:0 frame:0
          TX packets:750 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:62026 (60.5 KiB)  TX bytes:62026 (60.5 KiB)

most      Link encap:Ethernet  HWaddr 00:10:5A:C4:43:75  
          inet addr:  Bcast:  Mask:
          inet6 addr: fe80::210:5aff:fec4:4375/64 Scope:Link
          RX packets:1399 errors:0 dropped:0 overruns:0 frame:0
          TX packets:291 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:140531 (137.2 KiB)  TX bytes:29598 (28.9 KiB)

wifi0     Link encap:UNSPEC  HWaddr 00-19-E0-8A-F3-9D-00-00-00-00-00-00-00-00-00-00  
          RX packets:26901 errors:0 dropped:648 overruns:0 frame:1104
          TX packets:4852 errors:1 dropped:16 overruns:0 carrier:0
          collisions:0 txqueuelen:199 
          RX bytes:3816647 (3.6 MiB)  TX bytes:358523 (350.1 KiB)
brctl show most
bridge name	bridge id		STP enabled	interfaces
most		8000.00105ac44375	no		ath0
brctl showmacs most
port no	mac addr		is local?	ageing timer
  2	00:10:5a:c4:43:75	yes		   0.00
  2	00:15:99:24:94:a3	no		  46.47
  1	00:19:e0:8a:f3:9d	yes		   0.00
  1	00:1d:68:f5:27:9d	no		   5.49
  2	00:e0:18:ed:87:7d	no		   0.30
arp -n
Address                  HWtype  HWaddress           Flags Mask            Iface              ether   00:E0:18:ED:87:7D   C                     most                    (incomplete)                              most
Do you see this incomplete entry? Why does this happen? I get the same incomplete problem for the address on the "Linux desktop" box. I don't get it. Level 2 is apparently working inside the bridge as I can see all the relevant MAC addresses learned by the bridge. Why the rest of the system doesn't see that?

I would appreciate your help if somebody have a clue what is happening here.

Best regards,

Last edited by Rostfrei; 10-22-2008 at 02:08 PM.


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