NAME

       kxdpgun - XDP-powered DNS benchmarking tool

SYNOPSIS

       kxdpgun [options] -i filename targetIP

DESCRIPTION

       Powerful generator of DNS traffic, sending and receiving packets through XDP.

       Queries are generated according to a textual file which is read sequentially in a loop until a configured
       duration  elapses.  The  order of queries is not guaranteed. Responses are received (unless disabled) and
       counted, but not checked against queries.

       The number of parallel threads is autodetected according to the  number  of  queues  configured  for  the
       network interface.

   Options
       -t, --duration seconds
              Duration of traffic generation, specified as a decimal number in seconds (default is 5.0).

       -T, --tcp
              Send queries over TCP.

       -Q, --qps queries
              Number  of  queries-per-second  (approximately)  to be sent (default is 1000).  The program is not
              optimized for low speeds at which it may lose communication packets. The recommended minimum speed
              is 2 packets per thread (Rx/Tx queue).

       -b, --batch size
              Send more queries in a batch. Improves QPS but may affect the counterpart's packet  loss  (default
              is 10 for UDP and 1 for TCP).

       -r, --drop
              Drop incoming responses. Improves QPS, but disables response statistics.

       -p, --port number
              Remote destination port (default is 53).

       -F, --affinity cpu_spec
              CPU affinity for all threads specified in the format [<cpu_start>][s<cpu_step>], where <cpu_start>
              is the CPU ID for the first thread and <cpu_step> is the CPU ID increment for next thread (default
              is 0s1).

       -i, --infile filename
              Path to a file with query templates.

       -I, --interface interface
              Network interface for outgoing communication. This can be useful in situations when the interfaces
              are in a bond for example.

       -l, --local localIP[/prefix]
              Override  the  auto-detected  source IP address. If an address range is specified instead, various
              IPs from the range will be used for different queries uniformly.

       targetIP
              The IPv4 or IPv6 address of remote destination.

       -h, --help
              Print the program help.

       -V, --version
              Print the program version.

   Queries file format
       Each line describes a query in the form:

       query_name query_type [flags]

       Where query_name is a domain name to be queried, query_type is a record type name, and flags is a  single
       character:

       E Send query with EDNS.

       D Request DNSSEC (EDNS + DO flag).

   Signals
       Sending USR1 signal to a running process triggers current statistics dump to the standard output.

NOTES

       Linux kernel 4.18+ is required.

       The  utility  has  to  be  executed  under  root  or with these capabilities: CAP_NET_RAW, CAP_NET_ADMIN,
       CAP_SYS_ADMIN, and CAP_SYS_RESOURCE if maximum locked memory limit is too low on Linux < 5.11.

       The utility allocates source UDP/TCP ports from the range 2000-65535.

EXIT VALUES

       Exit status of 0 means successful operation. Any other exit status indicates an error.

EXAMPLES

       Manually created queries file:

          abc6.example.com. AAAA
          nxdomain.example.com. A
          notzone. A
          a.example.com. NS E
          ab.example.com. A D
          abcd.example.com. DS D

       Queries file generated from a zone file (Knot DNS format):

          cat ZONE_FILE | awk "{print \$1,\$3}" | grep -E "(NS|DS|A|AAAA|PTR|MX|SOA)$" | sort -u -R > queries.txt

       Basic usage:

          # kxdpgun -i ~/queries.txt 2001:DB8::1

       Using UDP with increased batch size:

          # kxdpgun -t 20 -Q 1000000 -i ~/queries.txt -b 20 -p 8853 192.0.2.1

       Using TCP:

          # kxdpgun -t 20 -Q 100000 -i ~/queries.txt -T -p 8853 192.0.2.1

SEE ALSO

       kdig(1).

AUTHOR

       CZ.NIC Labs <https://www.knot-dns.cz>

COPYRIGHT

       Copyright 2010–2022, CZ.NIC, z.s.p.o.

3.1.6                                              2022-02-08                                         KXDPGUN(8)