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4.15 Confi gure
>
DHCP Servers
>
Ethernet Port n
Westermo routers incorporate one or more Dynamic Host Con
fi
guration Protocol (DHCP) servers,
one for each Ethernet port. DHCP is a standard Internet protocol that allows a DHCP server to
dynamically distribute IP addressing and con
fi
guration information to network clients.
The
Confi gure
>
DHCP Servers
folder contains one page for each for the DHCP Server instances. In
addition, there is a separate page for mapping MAC addresses to
fi
xed IP addresses.
Using the Web Page(s)
The
Confi gure
>
DHCP Servers
pages allow you to set up the parameters for the DHCP servers.
The parameters are as follows.
Minimum assigned IP address:
This parameter speci
fi
es the lowest IP address that the DHCP server will assign to a client. Clearing
this parameter will disable the DHCP server. This may be necessary if another device on the LAN
provides a DHCP server.
IP address range:
This parameter is used to specify the number of different IP addresses that the DHCP server will
assign. A value of 10 would assign 10 addresses starting with the address set for the Minimum
assigned IP address parameter.
DNS server address:
This parameter speci
fi
es the IP address of a DNS server to be used by clients on the LAN. This will
usually be the IP address of the unit itself (as con
fi
gured by the
Confi gure
>
Ethernet
>
IP address
parameter). Alternatively, you may set this to the address of an alternative DNS server.
Gateway address:
A “gateway” is required in order to route data to IP addresses that are not on the local subnet. This
parameter speci
fi
es the IP address of the gateway (which is usually the IP address of the router itself
as con
fi
gured by the IP Address parameter on the
Confi gure
>
Ethernet
page). Alternatively, you
may set this to the address of another router on the LAN.
Mask:
This parameter speci
fi
es the subnet mask used on the network to which the unit is connected. For
example, for a Class A network this would be 255.255.255.0.
Next server address:
This parameter speci
fi
es the IP address of a secondary con
fi
guration server. This server does not
have to be on the same logical subnet as the client.
Lease time (mins):
This parameter speci
fi
es how long (in minutes), a DHCP client can use an assigned IP address before
it must renew its con
fi
guration with the DHCP server.