1NSNTRACE(1)                        nsntrace                        NSNTRACE(1)
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NAME

6       nsntrace - Perform a network trace of a process by using Linux network
7       namespaces
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SYNOPSIS

10       nsntrace [options] program [arguments]
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DESCRIPTION

13       nsntrace uses Linux network namespaces to perform network traces of the
14       specified program. The traces are stored as pcap files. And can later
15       be analyzed by applications such as wireshark.
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17       nsntrace creates a new network namespace and launches the specified
18       program in it. This will ensure that all the packets we trace come from
19       the system or the specified program.
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21       To get around the isolation caused by the network namespace a virtual
22       network interface is created. And in order for the program network
23       traffic to reach the root network namespace iptables is used.
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25       Since nsntrace uses iptables and traces raw sockets it needs to be run
26       as root.
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OPTIONS

29       The following options are understood:
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31       --device dev, -d dev
32           The network device to use in trace.
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34       --use-public-dns
35           Override resolv.conf in namespace to use public nameservers from
36           Quad9 (9.9.9.9), Cloudflare (1.1.1.1), Google (8.8.8.8) and OpenDNS
37           (208.67.222.222).
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39       --outfile file, -o file
40           Write the trace output to the file file. Default is nsntrace.pcap.
41           Use '-' for stdout.
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43       --user user, -u user
44           Run program with the user ID, group ID and supplementary groups of
45           user.
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47       --filter filter, -f filter
48           The capture filter to use while capturing. See pcap-filter(7) for
49           filter syntax.
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EXIT STATUS

52       On success, 0 is returned; otherwise, a non-zero failure code is
53       returned.
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AUTHOR

56       Jonas Danielsson <jonas@threetimestwo.org>
57           Original author
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61nsntrace                          07/22/2022                       NSNTRACE(1)
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