On Thu, Feb 4, 2016 at 6:21 PM, Michal Kazior <[email protected]> wrote:
> On 4 February 2016 at 13:46, Krishna Chaitanya <[email protected]>
> wrote:
>> On Thu, Feb 4, 2016 at 5:57 PM, Krishna Chaitanya
>> <[email protected]> wrote:
>>> On Thu, Feb 4, 2016 at 5:23 PM, Michal Kazior <[email protected]>
>>> wrote:
>>>> On 4 February 2016 at 12:49, Krishna Chaitanya <[email protected]>
>>>> wrote:
>>>>> On Thu, Feb 4, 2016 at 5:02 PM, Michal Kazior <[email protected]>
>>>>> wrote:
>>>>>> On 4 February 2016 at 12:22, Krishna Chaitanya
>>>>>> <[email protected]> wrote:
>>>>>>> Hi All,
>>>>>>>
>>>>>>> I am trying to run some iperf tests using mac80211_hwsim b/w AP and STA.
>>>>>>> Even after tweaking the routing table, the packets are still not going
>>>>>>> through
>>>>>>> mac80211_hwsim instead they are just looping back.
>>>>>>>
>>>>>>> After a quick search i found that we should use different network
>>>>>>> namespaces.
>>>>>>> Can anyone tell me the exact procedure for this? I have found a
>>>>>>> procedure
>>>>>>> in the below link, but i dont have the lxc-unshare for my embedded box.
>>>>>>> Is there any alternate way for this.
>>>>>>
>>>>>> If you have a recent enough iproute2 package you can use:
>>>>> Unfortunately i dont, will try to get the latest.
>>>>>> ip netns add ns1
>>>>>> ip netns exec ns1 bash # get the PID in the session and don't close it
>>>>>> iw phy phyX set netns $pid_of_that_shell
>>>>>> # you can close the bash now; phyX will remain in ns1
>>>>>>
>>>>>> Or you could try using ipv6 link-local addresses which will not
>>>>>> require you to use namespaces at all.
>>>>> Tried this but still not able to excite mac80211_hwsim TX path.
>>>>> below are commands and config.
>>>>>
>>>>> wlan0 Link encap:Ethernet HWaddr 02:00:00:00:00:00
>>>>> inet addr:10.0.0.1 Bcast:10.255.255.255 Mask:255.0.0.0
>>>>> inet6 addr: fe80::ff:fe00:0/64 Scope:Link
>>>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>>>> RX packets:8 errors:0 dropped:1 overruns:0 frame:0
>>>>> TX packets:38 errors:0 dropped:0 overruns:0 carrier:0
>>>>> collisions:0 txqueuelen:1000
>>>>> RX bytes:648 (648.0 B) TX bytes:3680 (3.5 KiB)
>>>>>
>>>>> wlan1 Link encap:Ethernet HWaddr 02:00:00:00:01:00
>>>>> inet addr:20.0.0.1 Bcast:20.255.255.255 Mask:255.0.0.0
>>>>> inet6 addr: fe80::ff:fe00:100/64 Scope:Link
>>>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>>>> RX packets:3 errors:0 dropped:0 overruns:0 frame:0
>>>>> TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
>>>>> collisions:0 txqueuelen:1000
>>>>> RX bytes:126 (126.0 B) TX bytes:808 (808.0 B)
>>>>>
>>>>> iperf -s -B fe80::ff:fe00:0 &
>>>>> iperf -c fe80::ff:fe00:0 -B fe80::ff:fe00:100 -t 60 -i 1
>>>>>
>>>>> Something wrong?
>>>>
>>>> For link-local addresses you must specify interface you want to use them.
>>>>
>>>> Also, there's an iperf switch to understand ipv6 "-V".
>>>>
>>>> iperf -V -i1 -s
>>>> iperf -V -i1 -c fe80::ff:fe00:0%wlan1
>>>> iperf -V -i1 -c fe80::ff:fe00:100%wlan0
>>>>
>>> Thanks a lot Michal. It worked like a charm.
>> Whenever i use the iperf -c, it starts a bi-directional stream,
>> How do i limit it to only for single direction?
>>
>> # iperf -V -i1 -c fe80::ff:fe00:0%wlan1
>> ------------------------------------------------------------
>> Client connecting to fe80::ff:fe00:0%wlan1, TCP port 5001
>> TCP window size: 43.8 KByte (default)
>> ------------------------------------------------------------
>> [ 3] local fe80::ff:fe00:100 port 34808 connected with
>> fe80::ff:fe00:0 port 5001
>> [ 5] local fe80::ff:fe00:0 port 5001 connected with fe80::ff:fe00:100
>> port 34808
>
> Hmm.. Are you perhaps running `iperf -V -i1 -s &` (i.e. in the
> background) with the same stdout as the client :-) You're probably
> just seeing both the server and the client saying a connection has
> established at their ends.
>
Ok i understand. Thanks.
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