LevelOne ProCon GSW-2496 - Manual (Page 42)

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DNS:
It is Domain Name Server used to serve the translation between IP
address and name address.
The switch supports DNS client function to re-route the mnemonic name
address to DNS server to get its associated IP address for accessing
Internet. User can specify a DNS IP address for the switch. With this, the
switch can translate a mnemonic name address into an IP address.
There are two ways to specify the IP address of DNS. One is fixed mode,
which manually specifies its IP address, the other is dynamic mode, which
is assigned by DHCP server while DHCP is enabled. DNS can help you
easily remember the mnemonic address name with the meaningful words
in it. Default is no assignment of DNS address.
Default: 0.0.0.0