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# Netem Tool
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# NetEm Tool
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*Note:* This tool is in the alpha stage!
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**Note:** This tool is in the alpha stage!
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This tool can be used to conduct network RTT measurements, convert them into NetEm delay distribution tables, and load these tables into the network emulator.
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Two methods for measuring the RTT are supported:
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1. Faked 3-way TCP handshake: Uses the delay between initial SYN and ACK packets in the handshake of a TCP connection.
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2. ICMP echo/request packets (as used by `ping`)
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This tool uses a 3-way TCP handshake to measure the _real_ round-trip-time of a TCP connection.
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The gathered information can be used to configure the Linux network emulation queuing discipline (see [tc-netem(8)](http://man7.org/linux/man-pages/man8/tc-netem.8.html)).
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It is possible to directly pass the results of the RTT probes to the Kernel by using a netlink socket and [libnl](http://www.infradead.org/~tgr/libnl/).
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