[c-nsp] TCP throughput /WAN delay simulation with back to back routers

[Thilak T]

Thanks Ivan,Kaegler, Wouter & sthaug

. I could find a similar software which runs on windows and was able
to introduce desired delay. (I used shunra Ve -
http://static.shunra.com/free-trials.php).

regards

Thilak


On Wed, Aug 19, 2009 at 1:54 PM, Kaegler, Mike<KaeglerM at tessco.com> wrote:
> If you have a linux machine laying around (a default ubuntu install will
> do...), drop it on the same subnet as either one of the two PCs. (only one
> ethernet card needed)
>
> Do:
> iptables -A OUTPUT -p icmp --icmp-type redirect -j DROP
> tc qdisc add dev eth0 root netem delay 45msec
> echo -n 1 > /proc/sys/net/ipv4/ip_forward
>
> On the PC on the same subnet, set the default gateway to be the IP of the
> linux machine. Done. You can change the delay with `tc qdisc change dev eth0
> root netem delay <whatever>`
>
> This technically only induces delay in one direction (you could do it
> bidirectionally by sending it from the router to the linux box) but the net
> net won't affect your LFN testing.
> -porkchop
>
>
> On 8/19/09 3:17 PM, "Thilak T" <thilak.t at gmail.com> wrote:
>
>> Hello Folks ,
>>
>> I am trying to test TCP throughput with different variables. I want to
>> simulate a delay of aprox 45msec between two test PCs connected two
>> bat to back routers . How do we introduce an artificial delay where in
>> the actual delay is on 2-3 msec.Using cisco routers.?
>>
>> Thilak
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>
> --
> Michael Kaegler, TESSCO Technologies: Engineering, 410 229 1295
> Your wireless success, nothing less. http://www.tessco.com/
>
>