[Winpcap-users] Slow sending?

[New accounts at sandmik.net]

Thank you very much for your help.

I will definitely look at the source for ettercap.

One question, is there a way to minimize the system call?
    What did you mean by: A Rx 1 sec delay is normal if you don't set a 
low timeout and mintocopy.
    How can set a low timeout or a mintocopy?

    Thanks a lot.

Loris Degioanni wrote:

> As far as I know, libdnet and most of the other traffic injection 
> libraries end up using WinPcap for actual transmission, so switching 
> to them is not going to help a lot.
>
> First of all, a delay of 1 second seems quite huge, even if a system 
> call per packet is issued. Are you sure the delay is in transmission 
> and not in reception?
> A Rx 1 sec delay is normal if you don't set a low timeout and mintocopy.
>
> Second: I know of several winpcap-based arp poisoners, and they appear 
> to work pretty well. You may want to look at their sources to learn 
> how they achieve that. For example, look at 
> http://ettercap.sourceforge.net for a very well known one. You'll find 
> more of them at http://www.winpcap.org/misc/links.htm#tools.
>
> Loris
>
>
> New accounts at sandmik.net wrote:
>
>> Thank you loris for trying to help me.
>>
>> I have used the queue version as well but I did not get higher 
>> performance, I believe because everytime I call this function I only 
>> have one packet to send. My ARP Poisoner has to relay packets as soon 
>> as they come... So I have this incredible delay.
>>
>> I think I will be looking into other means (maybe other libraries) of 
>> sending the packets (like libdnet, just found it on the web).
>>
>> If you have used any other mean to send ethernet packets, I would 
>> appreciate the help.
>>
>> Thanks again.
>>
>> Loris Degioanni wrote:
>>
>>> If you want to increase the Tx performance, use buffered send 
>>> functions(pcap_sendqueue*). pcap_sendpacket() does a context switch 
>>> per packet, that's the reason why it's so slow.
>>>
>>> Loris
>>>
>>>
>>> Accounts wrote:
>>>
>>>> Hi Everybody.
>>>>
>>>>    I am using WinPCap to do active redirection of packets. Everything
>>>> is working very well except I have one problem.
>>>>
>>>> WinPCap seems to be very slow to send the packets?
>>>>
>>>> I checked my code from the time I receive the packet to my code until
>>>> the time I call pcap_sendpacket, there is less than 1 ms so I know the
>>>> problem
>>>> is not a bottleneck in my code. However looking at ethereal and doing
>>>> some pinging tests. It looks like after I call pcap_sendpacket it is
>>>> taking up to 1 second to actually go out.
>>>>
>>>>    Any ideas?!
>>>>
>>>>    Any help would be appreciated.
>>>>
>>>>    And also I tried to use send queues but the same problem.
>>>>
>>>>
>>>>
>>>>
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>>
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