Thanks all for these comments. (I appreciate the snarkiness of the name "comcast".) Rich > On May 23, 2020, at 4:22 PM, Erik Auerswald <auerswal@xxxxxxxxxxxxxxxxx> wrote: > > Hi, > > recently someone asked about a script for simulating or emulating degraded > network conditions. I could not provide an answer, because I do not have > something like that available, yet. > > But I have just read about "Comcast" which seems to do just that: > https://github.com/tylertreat/Comcast > > The README.md contains information on how to use iptables and/or tc > directly instead of through Comcast as well: > > """ > Linux > > On Linux, you can use iptables to drop incoming and outgoing packets. > > $ iptables -A INPUT -m statistic --mode random --probability 0.1 -j DROP > $ iptables -A OUTPUT -m statistic --mode random --probability 0.1 -j DROP > > Alternatively, you can use tc which supports some additional options. > > $ tc qdisc add dev eth0 root netem delay 50ms 20ms distribution normal > $ tc qdisc change dev eth0 root netem reorder 0.02 duplicate 0.05 corrupt 0.01 > > To reset: > > $ tc qdisc del dev eth0 root netem > """ > -- https://github.com/tylertreat/Comcast#linux > > I have not tested this, but it seems to provide a starting point for > experimentation. > > HTH, > Erik > -- > To a first approximation, we can say that accidents are almost always > the result of incorrect estimates of the likelihood of one or more things. > -- C. Michael Holloway, NASA
