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OsmoPCAP » History » Version 2

laforge, 03/04/2020 08:35 PM

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h1. OsmoPCAP
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osmo-pcap has been created to collect network traces at different nodes but store them centrally at a dedicated note for further analysis. This might be needed for auditing, resolving conflicts, post processing or debugging a distributed system.
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The system consists out of the *osmo-pcap-client* to cpature traffic at a host and *osmo-pcap-server* to receive the traffic, store and rotate the traffic at a centralized server. There is a shell script to compress and expire old traces.
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h2. osmo-pcap-client
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The @osmo-pcap-client@ is using libpcap and has a built-in detector for the GPRS-NS/BSSGP protocol to exclude user traffic. The client is known to work on 32/64 bit systems. It can be configured through the VTY and the minimal config includes the interface to monitor, the pcap filter to use and the server to send it to.
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h2. osmo-pcap-server
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The @osmo-pcap-server@ will listen for new TCP connections and then will receive the data from the client if it is coming from a known/good source IPv4/port. The server is configured to write one file per client and to
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change/rotate the file when the link encapsulation is changing. It can be configured to rotate the file a given time interval and/or if the file size is over a threshold.
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The osmo-pcap-server comes with a shell script to rotate and compress old traces. Currently the configuration parameters (age or amount based) need to be tuned in the script itself.
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