Arachne 
Arachne is a packet loss detection system and an underperforming path detection system. It provides fast and easy active end-to-end functional testing of all the components in Data Center and Cloud infrastructures. Arachne is able to detect intra-DC, inter-DC, DC-to-Cloud, and DC-to-External-Services issues by generating minimal traffic:
- Reachability
- Round-trip and 1-way latency
- Silent packet drops and black holes
- Jitter (average of the deviation from the network mean latency)
- PMTU or Firewall issues too related possibly to network config changes (accidental or not)
- Whether network-level SLAs are met
Usage
There are two ways to use the Arachne package.
As a standalone program
Run Arachne as a standalone program (it's Debian packaged already too).
As a library in your own program
Import this package and call Arachne from your program/service with
arachne.Run(config, arachne.ReceiverOnlyMode(false))
where the option provided above is among the few optional ones.
Below is the list of all the CLI options available, when Arachne is used as a standalone program. The default options should be good enough for most users.
$ arachne --help
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Usage: arachne [--foreground] [-c=] [--receiver_only] [--sender_only]
Arachne is a packet loss detection system and an underperforming path detection
system for Data Center and Cloud infrastructures.
Options:
-v, --version Show the version and exit
--foreground=false Force foreground mode
-c, --config_file="/usr/local/etc/arachne/arachne.yaml" Config file path
(default: /usr/local/etc/arachne/arachne.yaml)
--receiver_only=false Force TCP receiver-only mode
--sender_only=false Force TCP sender-only mode
Note on required privileges to run
Arachne is granted access to raw sockets without the need to run with sudo or as root user, by being granted CAP_NET_RAW capability (see: capabilities).
Note on BPF filtering
When receiving packets, Arachne attempts to apply a BPF filter to the raw socket so that processing of packets occurs on a much smaller set (ones destined specifically for Arachne agent testing). This is currently supported only on Linux and thus performance will be worse on BSD-based systems where a larger number of packets must be inspected.
Released under the MIT License.
