- I. Capturing packets with Wireshark/Tshark
- There are two ways of installing Wireshark/Tshark on Debian:
- I./a. Installing dumpcap without allowing non-root users to capture packets
- Only root user will be able to capture packets. It is advised to capture
- packets with the bundled dumpcap program as root and then run
- Wireshark/Tshark as an ordinary user to analyze the captured logs. 
- This is the default on Debian systems.
- I./b. Installing dumpcap and allowing non-root users to capture packets
- Members of the wireshark group will be able to capture packets on network
- interfaces. This is the preferred way of installation if Wireshark/Tshark
- will be used for capturing and displaying packets at the same time, since
- that way only the dumpcap process has to be run with elevated privileges
- thanks to the privilege separation.
- Note that no user will be added to group wireshark automatically, the
- system administrator has to add them manually.
- The additional privileges are provided using the Linux Capabilities
- system where possible or using the set-user-id bit, where the Linux
- Capabilities are not present (Debian GNU/kFreeBSD, Debian GNU/Hurd).
- Linux kernels provided by Debian support Linux Capabilities, but custom
- built kernels may lack this support. If the support for Linux
- Capabilities is not present at the time of installing wireshark-common
- package, the installer will fall back to set the set-user-id bit to
- allow non-root users to capture packets.
- If installation succeeds with using Linux Capabilities, non-root users
- will not be able to capture packets while running kernels not supporting
- Linux Capabilities.
- The installation method can be changed any time by running:
- dpkg-reconfigure wireshark-common
- II. Installing SNMP MIBs
- SNMP  OIDs can be decoded using MIBs provided by other packages.
- wireshark-common suggests snmp-mibs-downloader which package can be used to
- download a set of common MIBs Wireshark/Tshark tries to load at startup.
- At the time of writing, MIBs are distributed under DFSG incompatible terms
-  thus snmp-mibs-downloader has to be in the non-free archive area.
- To keep wireshark in the main area , wireshark-common does not depend on
- or recommend snmp-mibs-downloader and as a result snmp-mibs-downloader is
- not installed automatically with wireshark.
- To make Wireshark/Tshark able to decode OIDs, please install
- snmp-mibs-downloader manually.
- To help Wireshark/Tshark to decode OIDs without having to install packages
- manually, please support the initiative of requesting additional rights
- from RFC authors .
-  http://wiki.wireshark.org/Development/PrivilegeSeparation
-  http://wiki.wireshark.org/CaptureSetup/CapturePrivileges
-  https://blog.wireshark.org/2010/02/running-wireshark-as-you
-  http://wiki.wireshark.org/SNMP
-  http://wiki.debian.org/NonFreeIETFDocuments
-  http://www.debian.org/doc/debian-policy/ch-archive.html#s-non-free
-  http://www.debian.org/doc/debian-policy/ch-archive.html#s-main
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