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DOMAIN
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domain <subcommand>
The domain commands control and show the working of the name to
Internet address mapping software (referred to as DNS: Domain Name Service).
JNOS has both a DNS client and a server. The server will answer queries from
data in the domain cache, and from information stored in the DOMAIN.TXT file.
The DNS server is only available when DOMAINSERVER is defined in config.h,
but the DNS client is always available.
domain addserver <hostid> [<timeout>]
Add a domain name server to the list of name servers.
<timeout> is an optional timeout setting in seconds for
this server. If <timeout> is not included in the command, the
value defaults to 3 * (tcp_irtt). Servers are queried in the
opposite order in which they were added.
Example: domain addserver wg7j.ece.orst.edu
domain addserver 128.193.48.1
domain addserver ucsd.edu
domain cache <subcommand>
The following commands work on the domain cache, which contains
resource records held in memory (see RFC1033/1034).
domain cache clean [<yes | NO>]
Displays or sets the discarding of expired resource records.
Expired records have their time-out value decremented to zero.
Normally resource records get a default time-out value of 1800
seconds. After this time they are considered "old" and if
referenced again the domain name resolver should be inquired
again. When clean is NO (the default), expired records will
be retained; if no replacement can be obtained from another
domain name server, these records will continue to be used.
When clean is YES, expired records will be removed from the
file whenever any new record is added to the file.
domain cache dump
Immediately clears the domain cache.
domain cache list
This command shows the current content of the in-memory cache
of resource records.
domain cache size [<size>] Default: 5
(B) Display or set the maximum size (number of entries) of
the local in-memory domain cache.
Example: domain cache size 10
domain cache wait [<secs>] Default: 300
Display or set the number of seconds which must elapse before
the domain.txt file is updated from the resource records stored
in the domain cache. Updating is controlled by the 'domain
update' command (see also).
domain dns [on|off]
(B) Display or toggle the state of the Domain Name Server. If
on, the system is active as a Domain Name Server. The system will
then answer queries from other tcp/ip hosts regarding hostname to
ip-address, and ip-address to hostname translations. For more
information, see the section SETTING UP THE DOMAIN NAME SYSTEM (in
the JNOS40 CONFIGURATION MANUAL, the relevant section is called
'Configuring the Domain Name System').
The dns subcommand is only available when DOMAINSERVER was defined
when Jnos was compiled.
domain dropserver <hostid>
Remove a domain name server from the list of name servers. You
are warned when you delete the last name server.
Example: domain dropserver ece.orst.edu
domain listservers
List the currently configured domain name servers, along with
statistics on how many queries and replies have been
exchanged with each one, response times, etc.
domain look <search_text>
This command searches domain.txt and displays records matching
<search_text>. The supplied <search_text> must match exactly, ie,
case is significant. This subcommand is available only if
MORESESSION was defined when Jnos was compiled.
domain maxclients [<N>] Default: 6
This command sets or displays the maximum number of simultaneous
DNS server processes allowed. This subcommand is available only if
DOMAINSERVER was defined when Jnos was compiled.
domain maxwait [<time-out>]
(B) This sets a time-out value (1 to 255 seconds) for a query of
a domain name server. This is not set for an already defined
server but will be used for a newly defined name server. Also
the value is used for domain name lookups (E.g. when a user does
a telnet to a host with the nodeshell 'T host' command). Note
that (PC based) name servers can have trouble finding records in
a large database. Default is 60 seconds.
Example: domain maxwait 10
domain query <hostid>
The query command displays the results of asking the DNS servers for
any domain records for <hostid>. THis command is available when Jnos
was compiled with DQUERYSESSION #define'd.
domain retries [<retries>]
(B) The retry value (number) limits the number of queries sent
out to remote domain name resolvers before giving up and telling
you that host xyzzy.ampr.org does not exist. The total time lost
with a query is (retries * time-out * number of domain servers
defined); i.e., the delay between requesting a hostname to ip-
address translation and getting the answer can become very long
if you use many servers, and set the time-outs/retries high !
Default is 2.
Example: domain retries 1
domain subnet [ON | off]
This command works in conjunction with 'domain translate' to
allow or disallow translation of any address ending in 0 or 255.
On systems which have a lot of subnets, turning off subnet
translation can result in a considerable speedup when displaying
routes with 'domain translate on'.
domain suffix [<domain suffix> | none]
Display or specify the default domain name suffix to be appended
to a host name when it contains no periods. For example, if the
suffix is set to "ampr.org." and the user enters 'telnet ka9q',
the domain resolver will attempt to find 'ka9q.ampr.org.' If the
host name being sought contains one or more periods, however, the
default suffix is NOT applied if the last part of the name is
less than 5 characters and contains only letters; e.g., 'telnet
foo.bar' would NOT be turned into 'foo.bar.ampr.org.' 'telnet
foo.ka9q' will be turned into 'foo.ka9q.ampr.org.' Note that a
trailing dot (.) is required for the suffix. If the suffix is
the string 'none' (without trailing period), the current suffix
is cleared and forgotten. Default is "ampr.org."
Example: domain suffix ece.orst.edu.
domain trace [on| OFF]
(B) Display or set the flag controlling the tracing of domain
server requests and responses. This only works when console is
enabled. Default is off.
Example: domain trace on
domain translate [on | OFF]
(B) Display or set the flag that controls the translation of ip
addresses in dot notation into symbolic names. The translation
process makes heavy use of reverse domain name lookups. Do not
set this flag unless you have a good and fast connection to a
domain name server.
Example: domain translate on
domain ttl [ttl]
Select a default 'ttl' value to be applied to server responses
than contain none. This subcommand is available only if
DOMAINSERVER was defined when Jnos was compiled.
domain update [ON | off]
Controls whether or not the domain.txt file is updated with server
responses. See also 'domain cache wait'.
domain verbose [on | OFF]
(B) Display or set the flag controlling the return of a full name
(on) or only the first name (dot delimiter) (off). This is for
IP address to name translation only. If off, home.wg7j.ampr.org.
will show as 'home.wg7j', whereas if on it will show as
'home.wg7j.ampr.org'
Example: domain verbose on