>From tcpdump man page:
*-p**--no-promiscuous-mode**Don't* put the interface into promiscuous mode.
Note that the interface might be in promiscuous mode for some other reason;
hence, `-p' cannot be used as an abbreviation for `ether host
{local-hw-addr} or ether broadcast'.
DonWB5EKU
On Wed, Sep 17, 2014 at 3:59 PM, Brandon I <[email protected]> wrote:
> >debian@beaglebone:/Distrib/Scripts$ sudo tcpdump -p -i eth0 host
> 224.0.0.1 -n
>
> What does the -p do?
>
> On Wednesday, September 17, 2014 12:45:27 AM UTC-7, Mickae1 wrote:
>>
>> Well .....
>>
>> I know google too, and I know this link . Thx for the answer .
>>
>>
>> My problem is that the beagle still receive the multicast packet (yes it
>> ignore all multicast packet), which is a problem for me when you are in a
>> network full of camera That love to send multicast packet !
>>
>> I tried to disable multicast in the kernel, but it still receive
>> multicast packet. Do you know a solution to prevent this ?
>>
>>
>> Micka,
>>
>> On Tue, Sep 16, 2014 at 9:43 PM, Brandon I <[email protected]> wrote:
>>
>>> First google result seems useful:
>>>
>>> http://stackoverflow.com/questions/16374670/why-i-can-
>>> not-disable-multicast-request
>>>
>>>
>>> On Tuesday, September 16, 2014 7:14:10 AM UTC-7, Mickae1 wrote:
>>>>
>>>> I've tried to deactivate the Multicast with :
>>>>
>>>> ifconfig eth0 -multicast
>>>>
>>>> But when i check with this command, I can still see :
>>>>
>>>> ip maddr show
>>>>
>>>> 2: eth0
>>>> link 33:33:00:00:00:01
>>>> link 01:00:5e:00:00:01
>>>> link 33:33:ff:9a:05:07
>>>> * inet 224.0.0.1*
>>>> inet6 ff02::1:ff9a:507
>>>> inet6 ff02::1
>>>>
>>>>
>>>> Which is not good for me !
>>>>
>>>>
>>>> i've tried :
>>>>
>>>> debian@beaglebone:/Distrib/Scripts$ sudo ip -r maddr delete 224.0.0.1
>>>> dev eth0
>>>>
>>>> ioctl: No such file or directory
>>>>
>>>>
>>>> I also tried to ping 224.0.0.1 from an another device .
>>>>
>>>> And with the command tcpdump I can see that I'm receiving multicast
>>>> packet :
>>>>
>>>> debian@beaglebone:/Distrib/Scripts$ sudo tcpdump -p -i eth0 host
>>>> 224.0.0.1 -n
>>>>
>>>> tcpdump: verbose output suppressed, use -v or -vv for full protocol
>>>> decode
>>>> listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
>>>> 16:09:28.679257 IP *190.190.167.1 > 224.0.0.1*: ICMP echo request, id
>>>> 1, seq 1913, length 40
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> Why ? I really don't know what to do about it, My idea is to deactivate
>>>> multicast in the kernel build config ..... Does it sounds good for you ?
>>>>
>>>>
>>>>
>>>> Thank you,
>>>>
>>>>
>>>> Micka.
>>>>
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>>
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