added some use cases
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README.md
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README.md
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@ -4,15 +4,31 @@ This tool uses the 3-way TCP handshake to measure the real RTT of a TCP connecti
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### Usage
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###### Use case 1: collect probing measurements
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Run TCP SYN/ACK probes to measure round-trip-time (RTT):
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./netem probe 8.8.8.8 > probing.dat
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###### Use case 2: convert measurements into delay distribution table
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Collect measurements to build a tc-netem(8) delay distribution table
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###### Use case 3
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The output of this command and be stored in a file or directly passed to the `emulate` subcommand:
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./netem probe 8.8.8.8 | ./netem emulate
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./netem emulate < probing.dat
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To apply the network emulation only to a limit stream of packets, you can use the `mark` tool:
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sudo LD_PRELOAD=${PWD}/mark.so MARK=0xCD ping google.de
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Please make sure the specify the environmental variables after the sudo command!
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This is necessary, as `ping` is a SUID program.
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The dynamic linker strips certain enviromental variables (as `LD_PRELOAD`) for security reasons!
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### Building
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##### Install libnl
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@ -46,6 +62,7 @@ For building libnl (make libnl)
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- http://www.infradead.org/~tgr/libnl/
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- https://www.kernel.org/doc/Documentation/networking/timestamping.txt
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- https://github.com/shemminger/iproute2/tree/master/netem
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- [tc-netem(8)](http://man7.org/linux/man-pages/man8/tc-netem.8.html)
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### Author
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