1KXDPGUN(8)                         Knot DNS                         KXDPGUN(8)
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NAME

6       kxdpgun - XDP-powered DNS benchmarking tool
7

SYNOPSIS

9       kxdpgun [options] -i filename targetIP
10

DESCRIPTION

12       Powerful  generator  of  DNS  traffic,  sending  and  receiving packets
13       through XDP.
14
15       Queries are generated according to a textual file which is read sequen‐
16       tially  in  a  loop  until  a configured duration elapses. The order of
17       queries is not guaranteed. Responses are received (unless disabled) and
18       counted, but not checked against queries.
19
20       The number of parallel threads is autodected according to the number of
21       queues configured for the network interface.
22
23   Options
24       -t, --duration seconds
25              Duration of traffic generation, specified as a decimal number in
26              seconds (default is 5.0).
27
28       -Q, --qps queries
29              Number of queries-per-second (approximately) to be sent (default
30              is 1000).
31
32       -b, --batch size
33              Send more queries in a batch. Improves QPS but  may  affect  the
34              counterpart's packet loss (default is 10).
35
36       -r, --drop
37              Drop  incoming  responses.  Improves  QPS, but disables response
38              statistics.
39
40       -p, --port number
41              Remote destination port (default is 53).
42
43       -F, --affinity cpu_spec
44              CPU  affinity  for  all  threads   specified   in   the   format
45              [<cpu_start>][s<cpu_step>],  where <cpu_start> is the CPU ID for
46              the first thread and <cpu_step> is the CPU ID increment for next
47              thread (default is 0s1).
48
49       -i, --infile filename
50              Path to a file with query templates.
51
52       -I, --interface interface
53              Network interface for outgoing communication. This can be useful
54              in situations when the interfaces are in a bond for example.
55
56       -l, --local localIP[/prefix]
57              Override the auto-detected source  IP  address.  If  an  address
58              range  is  specified instead, various IPs from the range will be
59              used for different queries uniformly.
60
61       targetIP
62              The IPv4 or IPv6 address of remote destination.
63
64       -h, --help
65              Print the program help.
66
67       -V, --version
68              Print the program version.
69
70   Queries file format
71       Each line describes a query in the form:
72
73       query_name query_type [flags]
74
75       Where query_name is a domain name to be queried, query_type is a record
76       type name, and flags is a single character:
77
78       E Send query with EDNS.
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80       D Request DNSSEC (EDNS + DO flag).
81

NOTES

83       Linux kernel 4.18+ is required.
84
85       The  utility  has to be executed under root or with these capabilities:
86       CAP_NET_RAW, CAP_NET_ADMIN, CAP_SYS_ADMIN, CAP_SYS_RESOURCE,  CAP_SETP‐
87       CAP.
88

EXIT VALUES

90       Exit  status of 0 means successful operation. Any other exit status in‐
91       dicates an error.
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EXAMPLES

94       Manually created queries file:
95
96          abc6.example.com. AAAA
97          nxdomain.example.com. A
98          notzone. A
99          a.example.com. NS E
100          ab.example.com. A D
101          abcd.example.com. DS D
102
103       Queries file generated from a zone file (Knot DNS format):
104
105          cat ZONE_FILE | awk "{print \$1,\$3}" | grep -E "(NS|DS|A|AAAA|PTR|MX|SOA)$" | sort -u -R > queries.txt
106
107       Program usage:
108
109          # kxdpgun -i ~/queries.txt 2001:1489:fffe:10::16
110
111          # kxdpgun -t 120 -Q 6000000 -i ~/queries.txt -b 5 -r -p 8853 192.168.101.2
112

SEE ALSO

114       kdig(1).
115

AUTHOR

117       CZ.NIC Labs <https://www.knot-dns.cz>
118

120       Copyright 2010–2021, CZ.NIC, z.s.p.o.
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1253.0.6                             2021-05-12                        KXDPGUN(8)
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