USRobotics NETServer/8 - Manual (Page 159)

Command Reference 10-9
Domain name
This is the name of the domain the NETServer belongs to. Both
the primary and the secondary name servers must belong to the
same domain. Use the following command:
set domain <domain name>
DNS Cache Reset Time-out
Once the NETServer has obtained a name resolution response
from a DNS server, it caches the results so that the name resolu-
tion information can be reused without further DNS requests.
The following command configures the length of time
NETServer caches individual DNS responses before refreshing
them (by issuing another DNS request):
set dnscache <DD:HH:MM>
You must specify days, hours and minutes as three two-digit
pairs separated by colons. For example,
set dnscache 00:00:30
The default is 30 minutes. Earlier versions of the NETServer
firmware also used 30 minutes for this function, but did not
allow you to change it.