[LARTC] Simulation with Packet Lost and Packet Delays

[LARTC] Simulation with Packet Lost and Packet Delays

[Tony Yat-Tung Cheung]

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Hi All,

I would like to be able to simulate network congestion and delay on 
tcp/udp connections between two hosts. I would need to simulate packet 
lost and packet delay.

I think I would need to use a Linux box with two network cards to act as 
a pass-through ethernet bridge. Is it the case? Does this how-to guide 
provides good information in this area?

Thank you very much! Any advice will be much appreciated.

Best Regards,
Tony Cheung

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Re: [LARTC] Simulation with Packet Lost and Packet Delays

[Stef Coene]

On Sunday 21 December 2003 16:31, Tony Yat-Tung Cheung wrote:
> Hi All,
>
> I would like to be able to simulate network congestion and delay on
> tcp/udp connections between two hosts. I would need to simulate packet
> lost and packet delay.
>
> I think I would need to use a Linux box with two network cards to act as
> a pass-through ethernet bridge. Is it the case? Does this how-to guide
> provides good information in this area?
http://snad.ncsl.nist.gov/itg/nistnet/

Stef

-- 
stef.coene@docum.org
 "Using Linux as bandwidth manager"
     http://www.docum.org/
     #lartc @ irc.openprojects.net

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Re: [LARTC] Simulation with Packet Lost and Packet Delays (How to

[Tony Yat-Tung Cheung]

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>From: Stef Coene <stef.coene@docum.org>
>To: tony.cheung@asiayeah.com,
>	Tony Yat-Tung Cheung <dragonman@asiayeah.com>, lartc@mailman.ds9a.nl
>Subject: Re: [LARTC] Simulation with Packet Lost and Packet Delays
>Date: Mon, 22 Dec 2003 17:03:27 +0100
>
>On Sunday 21 December 2003 16:31, Tony Yat-Tung Cheung wrote:
>  
>
>>Hi All,
>>
>>I would like to be able to simulate network congestion and delay on
>>tcp/udp connections between two hosts. I would need to simulate packet
>>lost and packet delay.
>>
>>I think I would need to use a Linux box with two network cards to act as
>>a pass-through ethernet bridge. Is it the case? Does this how-to guide
>>provides good information in this area?
>>    
>>
>http://snad.ncsl.nist.gov/itg/nistnet/
>
>Stef
>  
>
Hi Stef and others,

Thanks. The NISTNET looks like a very decent package. I have tried it 
briefly on a Red Hat 7.2 and it seems to work fine.

I have another basic question and I would if anyone could help me out.

Basically, I am trying a setup a Linux router between two local subnets, 
192.168.0.1/24 and 192.168.1.1/24. My Linux box has two ethernet cards, 
eth0 has IP address 192.168.0.1 (subnet mask 255.255.255.0) and eth1 has 
IP address 192.168.1.1 (subnet mask: 255.255.255.0). Now I wish my Linux 
box to be able to route traffic between eth0 and eth1.

I have modified '/etc/sysctl.conf' to,

# Controls IP packet forwarding
net.ipv4.ip_forward = 1

However, it doesn't seem to work right now. Is there anything else I 
need to do? I wish to set it up quickly and would appreciate any advice!

Thank you.

Best Regards,
Tony Cheung





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Re: [LARTC] Simulation with Packet Lost and Packet Delays (How toset

[andybr]

Did you try a traceroute from subnet so you can see 
where fails because if you a linux box with two nics, 
eth0: 192.168.0.1/24 and eth1: 192.168.1.1/24, behind 
the linux computer A: 192.168.0.2/24 gw 192.168.0.1, 
computer B: 192.168.1.2/24 gw 192.168.1.1, you must be 
able to ping from a to b or vice-versa unless if you set 
a rule to not do it. Check it out and return.

[]´s
Anderson



> 
> >From: Stef Coene <stef.coene@docum.org>
> >To: tony.cheung@asiayeah.com,
> >	Tony Yat-
Tung Cheung <dragonman@asiayeah.com>, lartc@mailman.ds9a.
nl
> >Subject: Re: [LARTC] Simulation with Packet Lost and P
acket Delays
> >Date: Mon, 22 Dec 2003 17:03:27 +0100
> >
> >On Sunday 21 December 2003 16:31, Tony Yat-
Tung Cheung wrote:
> >  
> >
> >>Hi All,
> >>
> >>I would like to be able to simulate network congestio
n and delay on
> >>tcp/udp connections between two hosts. I would need t
o simulate packet
> >>lost and packet delay.
> >>
> >>I think I would need to use a Linux box with two netw
ork cards to act as
> >>a pass-
through ethernet bridge. Is it the case? Does this how-
to guide
> >>provides good information in this area?
> >>    
> >>
> >http://snad.ncsl.nist.gov/itg/nistnet/
> >
> >Stef
> >  
> >
> Hi Stef and others,
> 
> Thanks. The NISTNET looks like a very decent package. I
 have tried it 
> briefly on a Red Hat 7.2 and it seems to work fine.
> 
> I have another basic question and I would if anyone cou
ld help me out.
> 
> Basically, I am trying a setup a Linux router between t
wo local subnets, 
> 192.168.0.1/24 and 192.168.1.1/24. My Linux box has two
 ethernet cards, 
> eth0 has IP address 192.168.0.1 (subnet mask 255.255.25
5.0) and eth1 has 
> IP address 192.168.1.1 (subnet mask: 255.255.255.0). No
w I wish my Linux 
> box to be able to route traffic between eth0 and eth1.
> 
> I have modified '/etc/sysctl.conf' to,
> 
> # Controls IP packet forwarding
> net.ipv4.ip_forward = 1
> 
> However, it doesn't seem to work right now. Is there an
ything else I 
> need to do? I wish to set it up quickly and would appre
ciate any advice!
> 
> Thank you.
> 
> Best Regards,
> Tony Cheung
> 
> 
> 
> 
> 

 
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