Simulating a "bad" connection.

Simulating a "bad" connection.

[Tommy W]

Hi,
I was just wondering if someone knows of a good way to simulate a "bad" 
network?.
I want high latency AND/OR high packet loss.

I was thinking along the lines  
iptables -I INPUT -m random --average 90 -j DROP

but then I get libipt_random.so doesn't exist.
I see that it is not included, how do you get it ?

kernel: 2.6.16-rc5
iptables: 1.3.4

or is there some other more simple solution?

Thanks in advance
/Tommy

Re: Simulating a "bad" connection.

[Jan Engelhardt]

On May 4 2007 22:01, Tommy W wrote:

>Hi,
>I was just wondering if someone knows of a good way to simulate a "bad" 
>network?.
>I want high latency AND/OR high packet loss.
>
>I was thinking along the lines  
>iptables -I INPUT -m random --average 90 -j DROP
>
>but then I get libipt_random.so doesn't exist.

  -m statistic --mode random

It might not exist yet either.

>I see that it is not included, how do you get it ?
>
>kernel: 2.6.16-rc5
>iptables: 1.3.4
>
>or is there some other more simple solution?
>
>Thanks in advance
>/Tommy
>

Jan
-- 

Re: Simulating a "bad" connection.

[Tommy W]

On Friday 04 May 2007 23:11, you wrote:
> On May 4 2007 22:01, Tommy W wrote:
> >Hi,
> >I was just wondering if someone knows of a good way to simulate a "bad"
> >network?.
> >I want high latency AND/OR high packet loss.
> >
> >I was thinking along the lines
> >iptables -I INPUT -m random --average 90 -j DROP
> >
> >but then I get libipt_random.so doesn't exist.
>
>   -m statistic --mode random
>
> It might not exist yet either.

Thanks for the tip, although I did not have that either :\
Is it included in a newer version of netfilter/iptables ?

/Tommy

Re: Simulating a "bad" connection.

[Pascal Hambourg]

Hello,

Jan Engelhardt a écrit :
> 
>   -m statistic --mode random
> 
> It might not exist yet either.

Indeed. The 'statistic' match was included in kernel 2.6.18 and requires 
iptables >= 1.3.6.

>>kernel: 2.6.16-rc5
>>iptables: 1.3.4

The 'random' match is supported by iptables 1.3.4, but not by the 
standard kernel. It needs to be patched with the 'connlimit' patch which 
used to be included in the patch-o-matic-ng snapshots until 
patch-o-matic-ng-20060511. Unfortunately such old snapshots are not 
available on the Netfilter main server any more. They may still be 
available in some archives or mirrors out there. I think I kept a copy.

Re: Simulating a "bad" connection.

[Pascal Hambourg]

Pascal Hambourg a écrit :
> 
> The 'random' match is supported by iptables 1.3.4, but not by the 
> standard kernel. It needs to be patched with the 'connlimit' patch

Dunno why I wrote 'connlimit'. I meant the 'random' patch of course.

Re: Simulating a "bad" connection.

[Andy Furniss]

Tommy W wrote:
> Hi,
> I was just wondering if someone knows of a good way to simulate a "bad" 
> network?.
> I want high latency AND/OR high packet loss.
> 
> I was thinking along the lines  
> iptables -I INPUT -m random --average 90 -j DROP
> 
> but then I get libipt_random.so doesn't exist.
> I see that it is not included, how do you get it ?
> 
> kernel: 2.6.16-rc5
> iptables: 1.3.4
> 
> or is there some other more simple solution?
> 
> Thanks in advance
> /Tommy
> 
> 

http://linux-net.osdl.org/index.php/Netem

Is in kernel.

Andy.

Re: Simulating a "bad" connection.

[Tommy W]

On Saturday 05 May 2007 21:07, Andy Furniss wrote:
> Tommy W wrote:
> > Hi,
> > I was just wondering if someone knows of a good way to simulate a "bad"
> > network?.
> > I want high latency AND/OR high packet loss.
> >
> > I was thinking along the lines
> > iptables -I INPUT -m random --average 90 -j DROP
> >
> > but then I get libipt_random.so doesn't exist.
> > I see that it is not included, how do you get it ?
> >
> > kernel: 2.6.16-rc5
> > iptables: 1.3.4
> >
> > or is there some other more simple solution?
> >
> > Thanks in advance
> > /Tommy
>
> http://linux-net.osdl.org/index.php/Netem
>
> Is in kernel.

Thanks, this looks alot like what I'm looking for
and that it's already included in my kernel is a real plus.

/Tommy