What tools are available to simulate certain network conditions on Ubuntu?

Question

In order to test our deployment I want to simulate certain network events like connection losses, timeout, limited bandwidths etc.

I already googled for this but haven't found something that really suited my needs. ipfw seems to be what I need but I can't seem to find an ipfw package for Ubuntu. Also I'd like to know whether there are alternatives or even better tools for my task.

You can use `iptables` and `tc`. – Mircea Vutcovici Feb 17 '11 at 15:05 — Mircea Vutcovici, Feb 17 '11 at 15:05

score 2 · Accepted Answer · answered Feb 17 '11 at 15:10

2

You can simulate those things with firewall.

Userland tool to modify firewall rules is called iptables

for example if you want to simulate 5 seconds of connection loss you can do this

iptables -I INPUT -p tcp -s source.ip.for.which.you.want.to.appear.to.timeout --dpor $port -j DROP ; sleep 5; iptables -D INPUT -p tcp -s source.ip.for.which.you.want.to.appear.to.timeout --dpor $port -j DROP ;

answered Feb 17 '11 at 15:10

Hrvoje Špoljar

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Thanks! Pretty cool! Is there something equally elegant to simulate high latencies? I'd like to say "port 1234 has a latency of XXXXms". – Jan Deinhard Feb 18 '11 at 07:50

score 0 · Answer 2 · answered Mar 06 '11 at 23:17

0

iptables is great, but some tools are sharper when dealing with this kind of problems.

Lagfactory (based on netem)
nistnet. Old but powerful.
dummynet

And also wanem, not a standalone app but more a customized router distro.

answered Mar 06 '11 at 23:17

petrus

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score 0 · Answer 3 · edited May 23 '17 at 12:41

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From the sister site Stack Overflow: Simulate delayed and dropped packets on Linux

edited May 23 '17 at 12:41

Community

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answered Mar 07 '11 at 01:05

Peter

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What tools are available to simulate certain network conditions on Ubuntu?

3 Answers3