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2.2
Specifying DHCP options
Further information can be transferred to the DHCP client using DHCP options. The various
DHCP options are defined in RFC 2132.
The DHCP options 1, 3, 6, 66 and 67 are created automatically when the IPv4 address band
is created. With the exception of option 1, the options can be deleted.
In this example, the following DHCP options are created.
DHCP option
1
3
6
66
67
Procedure
1. Click on "System" > "DHCP" in the navigation area and on the "DHCP Options" tab in the
content area.
2. Enable "Use Interface IP" for the DHCP options 3 and 6. Click on "Set Values". The IP
address of the device is entered automatically as the value.
SCALANCE M-800
Getting Started, 07/2020, C79000-G8976-C337-09
Information contained
Netmask
The subnet mask to match the IP address
For this example the subnet mask is: 255.255.255.0
Default gateway
IP address of the default gateway
Without this information, the DHCP client is only assigned an
IP address by the DHCP server and it can only communicate
with the nodes in the internal network.
DNS server
IP address of the DNS server
Without this information, the DHCP client is not automatically
assigned a DNS server. To allow name resolution, a DNS
server must be known to the DHCP client. This can also be
configured manually.
TFTP server
TFTP Server Address
This informs the DHCP client of the TFTP server to which it will
connect.
Bootfile Name
The DHCP client uses this file when it boots.
SCALANCE M-800 as DHCP server
2.2 Specifying DHCP options
51
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