[Winpcap-users] Slow sending?

[Loris Degioanni]

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.
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> Winpcap-users mailing list
>>> Winpcap-users at winpcap.org
>>> https://www.winpcap.org/mailman/listinfo/winpcap-users
>>>
>> _______________________________________________
>> Winpcap-users mailing list
>> Winpcap-users at winpcap.org
>> https://www.winpcap.org/mailman/listinfo/winpcap-users
>>
>>
> 
> _______________________________________________
> Winpcap-users mailing list
> Winpcap-users at winpcap.org
> https://www.winpcap.org/mailman/listinfo/winpcap-users
>