promiscus mode

promiscus mode

[Muruganandam]

Hi all,

   How to enable the Promiscus mode in the kernel,inorder to capture the
packets.Advance Thanks


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Re: promiscus mode

[Ray Olszewski]

At 12:30 PM 1/25/2005 +0530, Muruganandam wrote:

>Hi all,
>
>   How to enable the Promiscus mode in the kernel,inorder to capture the
>packets.Advance Thanks

It would be easier to answer this question if I better understood the level 
you are asking it at.

The beginner-level answer to it is to use an application and associated 
library (e.g, tcpdump or ethereal, and libpcap) that supports setting 
promiscuous mode.

For the details of how to set it in a NIC driver, I'd suggest referring to 
the source for libpcap; my quick scan of it leads me to suggest checking 
the pcap_open_live() function call.

Of course, you need root access to do any of this.




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Re: promiscus mode

[Jim Nelson]

Ray Olszewski wrote:
> At 12:30 PM 1/25/2005 +0530, Muruganandam wrote:
> 
>> Hi all,
>>
>>   How to enable the Promiscus mode in the kernel,inorder to capture the
>> packets.Advance Thanks
> 
> 
> It would be easier to answer this question if I better understood the 
> level you are asking it at.
> 
> The beginner-level answer to it is to use an application and associated 
> library (e.g, tcpdump or ethereal, and libpcap) that supports setting 
> promiscuous mode.
> 
> For the details of how to set it in a NIC driver, I'd suggest referring 
> to the source for libpcap; my quick scan of it leads me to suggest 
> checking the pcap_open_live() function call.
> 
> Of course, you need root access to do any of this.
> 
> 

And it may not work if you have some obscure hardware - all the common Ethernet 
drivers and chipsets support promiscuous mode, but some of the older boards and 
embedded chips may suprise you.

Jim
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Re: promiscus mode

[simon]

hello

Muruganandam wrote:
> Hi all,
> 
>   How to enable the Promiscus mode in the kernel,inorder to capture the
> packets.Advance Thanks
> 
> 
> -- 
> Kernelnewbies: Help each other learn about the Linux kernel.
> Archive:       http://mail.nl.linux.org/kernelnewbies/
> FAQ:           http://kernelnewbies.org/faq/
> 
> 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-newbie" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.linux-learn.org/faqs
> 

to put a interface into the promiscious mode... just be root and tape...
ifconfig eth0 promisc

and to unset the promiscious flag :
ifconfig eth0 -promisc

be carreful to remove this flag after usage... as it give extra job to 
the linux network stack...

simon
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