1DDNS-CONFGEN(8) BIND 9 DDNS-CONFGEN(8)
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6 ddns-confgen - ddns key generation tool
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9 ddns-confgen [-a algorithm] [-h] [-k keyname] [-q] [-s name] [-z zone]
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12 ddns-confgen is an utility that generates keys for use in TSIG signing.
13 The resulting keys can be used, for example, to secure dynamic DNS up‐
14 dates to a zone, or for the rndc command channel.
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16 The key name can specified using -k parameter and defaults to ddns-key.
17 The generated key is accompanied by configuration text and instructions
18 that can be used with nsupdate and named when setting up dynamic DNS,
19 including an example update-policy statement. (This usage is similar
20 to the rndc-confgen command for setting up command-channel security.)
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22 Note that named itself can configure a local DDNS key for use with
23 nsupdate -l; it does this when a zone is configured with update-policy
24 local;. ddns-confgen is only needed when a more elaborate configuration
25 is required: for instance, if nsupdate is to be used from a remote sys‐
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29 -a algorithm
30 This option specifies the algorithm to use for the TSIG key.
31 Available choices are: hmac-md5, hmac-sha1, hmac-sha224,
32 hmac-sha256, hmac-sha384, and hmac-sha512. The default is
33 hmac-sha256. Options are case-insensitive, and the "hmac-" pre‐
34 fix may be omitted.
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36 -h This option prints a short summary of options and arguments.
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38 -k keyname
39 This option specifies the key name of the DDNS authentication
40 key. The default is ddns-key when neither the -s nor -z option
41 is specified; otherwise, the default is ddns-key as a separate
42 label followed by the argument of the option, e.g., ddns-key.ex‐
43 ample.com. The key name must have the format of a valid domain
44 name, consisting of letters, digits, hyphens, and periods.
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46 -q This option enables quiet mode, which prints only the key, with
47 no explanatory text or usage examples. This is essentially iden‐
48 tical to tsig-keygen.
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50 -s name
51 This option generates a configuration example to allow dynamic
52 updates of a single hostname. The example named.conf text shows
53 how to set an update policy for the specified name using the
54 "name" nametype. The default key name is ddns-key.name. Note
55 that the "self" nametype cannot be used, since the name to be
56 updated may differ from the key name. This option cannot be used
57 with the -z option.
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59 -z zone
60 This option generates a configuration example to allow dynamic
61 updates of a zone. The example named.conf text shows how to set
62 an update policy for the specified zone using the "zonesub"
63 nametype, allowing updates to all subdomain names within that
64 zone. This option cannot be used with the -s option.
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67 nsupdate(1), named.conf(5), named(8), BIND 9 Administrator Reference
68 Manual.
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71 Internet Systems Consortium
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74 2022, Internet Systems Consortium
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799.16.30-RH DDNS-CONFGEN(8)