Tahoe 4681, User Manual

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Tahoe 4681 (4-port G.shdsl.bis/FastEthernet modem card)
DHCP Server Configuration
The dhcp command is used to configure DHCP/BOOTP server and relay agent. The server is
used to assign IP addresses, network masks, gateway and DNS addresses and other parameters
to the network stations. It is easy to reconfigure a network that uses a DHCP server – it is enough
to change server settings and every station will automatically retrieve new configuration.
The BOOTP protocol is an earlier and simpler version of DHCP. Its common use is booting of
diskless workstations. A workstation uses BOOTP to get its IP address and other network param-
eters together with TFTP server address, from which the operating system may be downloaded.
The DHCP protocol may deliver more working parameters including domain name, DNS address,
print server, syslog server, XWindow fontserver, MTU and TTL settings, and many others.
DHCP/BOOTP Relay Agent transfers DHCP and BOOTP requests and replies between separate
networks. The DHCP and BOOTP protocols work only within one physical subnet. The station
using such protocols doesn’t know its IP address yet, so its packets cannot be routed to other
networks. Relay Agent listens for such requests and forwards them to a DHCP server, which may
be placed anywhere in the network.
Review of the settings
Entering dhcp alone displays current server settings. Here is an example:
Tahoe> dhcp
DHCP/BOOTP server
default-lease-time 43200
max-lease-time 86400
network “lan” (eth0):
default-lease-time 43200
max-lease-time 86400
domain-name tahoe.pl
subnet “local”: 10.0.0.0/255.255.255.0
default-lease-time 43200
max-lease-time 86400
filename vmlinuz.2.6.15
next-server 192.168.0.5
routers 10.0.0.1
domain-name-servers 192.168.0.4
domain-name tahoe.pl
address ranges: 10.0.0.3-10.0.0.15
relay server 192.168.0.5 67