* [LARTC] Simulated latency
@ 2003-09-25 15:27 Morey ixipetl
2003-09-26 11:55 ` Walter D. Wyndroski
2003-09-28 0:21 ` sufcrusher
0 siblings, 2 replies; 3+ messages in thread
From: Morey ixipetl @ 2003-09-25 15:27 UTC (permalink / raw)
To: lartc
This seems like it ought to be simple, but so far, no joy. I need to
simulate latency in a network connection, e.g. a sattelite link, but
can't figure out how to do that. I don't need to drop packets or
otherwise limit rates, just introduce certain fixed amounts of latency.
I know about NIST Net, but would rather use iptables, ip, tc, etc. Any
ideas?
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http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [LARTC] Simulated latency
2003-09-25 15:27 [LARTC] Simulated latency Morey ixipetl
@ 2003-09-26 11:55 ` Walter D. Wyndroski
2003-09-28 0:21 ` sufcrusher
1 sibling, 0 replies; 3+ messages in thread
From: Walter D. Wyndroski @ 2003-09-26 11:55 UTC (permalink / raw)
To: lartc
Have you looked into Ethloop? Information can be found on the HTB site:
http://luxik.cdi.cz/~devik/qos/ethloop/
I know it is primarily used for testing qdiscs. I'm not sure if it will
simulate the latency, but it may be worth looking into.
Walt
----- Original Message -----
From: "Morey ixipetl" <mixipetl@comcast.net>
Cc: <lartc@mailman.ds9a.nl>
Sent: Thursday, September 25, 2003 11:27 AM
Subject: [LARTC] Simulated latency
> This seems like it ought to be simple, but so far, no joy. I need to
> simulate latency in a network connection, e.g. a sattelite link, but
> can't figure out how to do that. I don't need to drop packets or
> otherwise limit rates, just introduce certain fixed amounts of latency.
> I know about NIST Net, but would rather use iptables, ip, tc, etc. Any
> ideas?
>
>
>
> _______________________________________________
> LARTC mailing list / LARTC@mailman.ds9a.nl
> http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
>
>
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http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [LARTC] Simulated latency
2003-09-25 15:27 [LARTC] Simulated latency Morey ixipetl
2003-09-26 11:55 ` Walter D. Wyndroski
@ 2003-09-28 0:21 ` sufcrusher
1 sibling, 0 replies; 3+ messages in thread
From: sufcrusher @ 2003-09-28 0:21 UTC (permalink / raw)
To: lartc
You could use the iptables QUEUE target. It allows you to "catch" packets in
a user space program (e.g. perl), do stuff with it (or nothing: sleep) and
then ACCEPT the packet (or DROP).
It's a pretty crude method, but it works.
----- Original Message -----
From: "Morey ixipetl" <mixipetl@comcast.net>
Cc: <lartc@mailman.ds9a.nl>
Sent: Thursday, September 25, 2003 5:27 PM
Subject: [LARTC] Simulated latency
> This seems like it ought to be simple, but so far, no joy. I need to
> simulate latency in a network connection, e.g. a sattelite link, but
> can't figure out how to do that. I don't need to drop packets or
> otherwise limit rates, just introduce certain fixed amounts of latency.
> I know about NIST Net, but would rather use iptables, ip, tc, etc. Any
> ideas?
_______________________________________________
LARTC mailing list / LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
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2003-09-25 15:27 [LARTC] Simulated latency Morey ixipetl
2003-09-26 11:55 ` Walter D. Wyndroski
2003-09-28 0:21 ` sufcrusher
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