Hi,
I want to achieve the following goal using the 8021q.o and vconfig
components, but I can not find a way to do it.
Here is the scenario I want to support on my Linux platform:
eth0 _____________ ofdm0
-------------| station |-------------
| |
-------------
My station bridges together an ethernet interface (eth0) with a wireless
interface (ofdm0).
The eth0 link is hybrid (VLAN tagged and untagged can travel on the
link)
My requirements are the following:
In the direction eth0 ---> ofdm0, I want to :
1) VLAN tag the untagged ethernet frames with VLAN ID=4
2) Filter the VLAN tagged ethernet frames so that only those
with VLAN ID=5 and ID=6 go through
In the direction eth0 <---- ofdm0, I want to :
1) Untag the VLAN tagged ethernet frames with VLAN ID=4
2) Discard all the other frames except the ones VLAN tagged with
ID=5 and ID=6 (i.e. VLAN untagged frames and VLAN tagged frames with
ID !=4, !=5 and != 6)
Here is what I tried:
I)
vconfig add eth0 5
vconfig add ofdm 5
brctl addbr br5
brctl addif br5 eth0.5
brctl addif br5 ofdm.5
ifconfig br5 up
II)
vconfig add eth0 6
vconfig add ofdm 6
brctl addbr br6
brctl addif br5 eth0.6
brctl addif br5 ofdm.6
ifconfig br6 up
Sets of commands I and II implement the filtering functionality (items
2) in my requirements above). So far, only the VLAN tagged frames with
ID=5 or ID=6 go through the station. All is O.K.
Here are my bridges on my station at this point:
/sub/lm_scripts # brctl show
bridge name bridge id STP enabled interfaces
br6 8000.0013b5010160 yes eth0.6
ofdm.6
br5 8000.0013b5010160 yes eth0.5
Now I add the following commands:
III)
vconfig add ofdm 4
brctl addbr br4
brctl addif br4 eth0
brctl addif br4 ofdm.4
ifconfig br4 up
The brctl show commands outputs:
/sub/lm_scripts # brctl show
bridge name bridge id STP enabled interfaces
br4 8000.0013b5010160 yes eth0
ofdm.4
br6 8000.0013b5010160 yes eth0.6
ofdm.6
br5 8000.0013b5010160 yes eth0.5
ofdm.5
/sub/lm_scripts #
The behavior is that all the ethernet frames are going through the
bridge br4, and as a consequence, VLAN tagged frames are not bridged
properly anymore.
On the other hand, if I type only the set of commands III, I do very
well the VLAN tagging-untagging, but I obviously do not have the
filtering functionality. How can I achieve, at the same time, the two
functionalities (requirements) that I want to implement (VLAN tag-untag,
and filter VLAN tagged frames).
For your information
--------------------
In order to test this, I have the following IP routes and VLAN devices
on my end station connected to the eth0 link:
[root@wt0272 ~]# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
11.0.0.0 * 255.0.0.0 U 0 0 0
eth0.5
12.0.0.0 * 255.0.0.0 U 0 0 0
eth0.6
13.0.0.0 * 255.0.0.0 U 0 0 0
eth0
[root@wt0272 ~]#
[root@wt0272 ~]#
[root@wt0272 ~]# cat /proc/net/vlan/config
VLAN Dev name | VLAN ID
Name-Type: VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD
eth0.5 | 5 | eth0
eth0.6 | 6 | eth0
[root@wt0272 ~]#
I just ping on the different IP segments to generate my ethernet frames
with different VLAN tags (or no VLAN tag). I have a similar
configuration at the end station on the ofdm link of the setup.
Thanks.
Philippe O'Reilly
poreilly@xxxxxxxxxxx
