[strongSwan] A bug of nat-virtua-ip ?

kenxin lau liuqixing2005 at gmail.com
Fri Jun 1 14:35:51 CEST 2012

2012/6/1 Martin Willi <martin at strongswan.org>:
> Hi,
>> moon :
>>     cpu: 333 MHz PowerPC
>> Then the client alice  send  the udp packets of 100 bytes length every
>> 10 microseconds with about 10 threads at one time.  Under these
>> circumstances,  the idle of moon's CPU would be less than 10%, even
>> 0% .
> 10 * 100 bytes / 0.00001s = 100MB/s
> If you are really sending this much traffic, your embedded CPU is
> clearly overloaded, I don't think it can handle 100MB/s IPsec traffic.

I am so sorry for my spelling error,  they are  milliseconds ,not
microseconds. The bandwidth is as follow :

 10*100 bytes / 0.001 s = 1 MB/s

>> The second experiment, I used the same hardware platform to set up a
>> environment which just set up the NAT and  open the ip_forward in the
>> moon. And the udp packets of alice sent out to the gateway sun only
>> through the NAT of moon. The result is  that  the  idle of moon's CPU
>> would be  more than 95% all the time
> Did you have any IPsec processing in the first or second experiment? Are
> you sure that you have measured this correctly? I don't think that your
> CPU can handle much more than 1MB/s with 5% CPU load...
> Regards
> Martin

The first experiment had the IPsec processing , but the second
experiment did not.

The first experiment was the same as the net2net-psk:


The second experiment did not have any IPsec processing, which was
only NAT and route!

In addition, I used the Linux- to do the  nat-virtua-ip
experiment , I found that  it worked  better. The delay time was only
less than 2 seconds. Is that anything wrong with the Linux-2.6.32 ?



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