Secure forwarding of sFlow using ssh
This article describes a simple method of carrying sFlow datagrams over an encrypted ssh connection which can be useful in situations where a VPN is not available, for example, sending sFlow to an analyzer in the public cloud, or to an external consultant.
The diagram shows the elements of the solution. A collector on the site receives sFlow datagrams from the network devices and uses the sflow_fwd.py script to convert the datagrams into line delimited hexadecimal strings that are sent over an ssh connection to another instance of sflow_fwd.py running on the analyzer that converts the hexadecimal strings back to sFlow datagrams.
The following sflow_fwd.py Python script accomplishes the task:
#!/usr/bin/python
import socket
import sys
import argparse
parser = argparse.ArgumentParser(description='Serialize/deserialize sFlow')
parser.add_argument('-c', '--collector', default='')
parser.add_argument('-s', '--server')
parser.add_argument('-p', '--port', type=int, default=6343)
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, to be sent by the acceptor in response to prepare or propose messages with an invalid epoch number. These negative acknowledgements (NACKS) can also include further information such as the acceptor’s last promised epoch and last accepted proposal value. (There’s no point a proposer retrying with a new epoch less than the acceptor’s last promised one for example).