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8821cu-20210916/docs/linux_dhcp_server_notes.txt
2022-11-17 08:26:57 -06:00

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//Install dhcp server
[root@localhost ~]#yum install dhcp
//We shoule copy /usr/share/doc/dhcp-4.2.0/dhcpd.conf.sample to /etc/dhcp/dhcpd.conf
//and modifiy /etc/dhcp/dhcpd.conf as the following
[root@localhost ~]#cat /etc/dhcp/dhcpd.conf
# dhcpd.conf
#
# Sample configuration file for ISC dhcpd
#
# option definitions common to all supported networks...
option domain-name "example.org";
option domain-name-servers ns1.example.org, ns2.example.org;
default-lease-time 600;
max-lease-time 7200;
# Use this to enble / disable dynamic dns updates globally.
#ddns-update-style none;
# If this DHCP server is the official DHCP server for the local
# network, the authoritative directive should be uncommented.
#authoritative;
# Use this to send dhcp log messages to a different log file (you also
# have to hack syslog.conf to complete the redirection).
log-facility local7;
# No service will be given on this subnet, but declaring it helps the
# DHCP server to understand the network topology.
subnet 10.152.187.0 netmask 255.255.255.0 {
}
# This is a very basic subnet declaration.
subnet 10.254.239.0 netmask 255.255.255.224 {
range 10.254.239.10 10.254.239.20;
option routers rtr-239-0-1.example.org, rtr-239-0-2.example.org;
}
# This declaration allows BOOTP clients to get dynamic addresses,
# which we don't really recommend.
subnet 10.254.239.32 netmask 255.255.255.224 {
range dynamic-bootp 10.254.239.40 10.254.239.60;
option broadcast-address 10.254.239.31;
option routers rtr-239-32-1.example.org;
}
# A slightly different configuration for an internal subnet.
subnet 192.168.1.0 netmask 255.255.255.0 {
range 192.168.1.30 192.168.1.150;
option domain-name-servers 192.168.1.254;
option domain-name "internal.org";
option routers 192.168.1.254;
option broadcast-address 192.168.1.255;
default-lease-time 6000;
max-lease-time 7200;
}
subnet 172.21.69.0 netmask 255.255.255.0 {
}
# Hosts which require special configuration options can be listed in
# host statements. If no address is specified, the address will be
# allocated dynamically (if possible), but the host-specific information
# will still come from the host declaration.
host passacaglia {
hardware ethernet 0:0:c0:5d:bd:95;
filename "vmunix.passacaglia";
server-name "toccata.fugue.com";
}
# Fixed IP addresses can also be specified for hosts. These addresses
# should not also be listed as being available for dynamic assignment.
# Hosts for which fixed IP addresses have been specified can boot using
# BOOTP or DHCP. Hosts for which no fixed address is specified can only
# be booted with DHCP, unless there is an address range on the subnet
# to which a BOOTP client is connected which has the dynamic-bootp flag
# set.
host fantasia {
hardware ethernet 08:00:07:26:c0:a5;
fixed-address fantasia.fugue.com;
}
# You can declare a class of clients and then do address allocation
# based on that. The example below shows a case where all clients
# in a certain class get addresses on the 10.17.224/24 subnet, and all
# other clients get addresses on the 10.0.29/24 subnet.
class "foo" {
match if substring (option vendor-class-identifier, 0, 4) = "SUNW";
}
shared-network 224-29 {
subnet 10.17.224.0 netmask 255.255.255.0 {
option routers rtr-224.example.org;
}
subnet 10.0.29.0 netmask 255.255.255.0 {
option routers rtr-29.example.org;
}
pool {
allow members of "foo";
range 10.17.224.10 10.17.224.250;
}
pool {
deny members of "foo";
range 10.0.29.10 10.0.29.230;
}
}
[root@localhost ~]#
//Depends on the above setting, wlan interface IP would be 192.168.1.254
[root@localhost ~]#ifconfig wlan14 192.168.1.254
//Set only one interface as dhcp server
[root@localhost ~]#cat /etc/sysconfig/dhcpd
# Command line options here
DHCPDARGS=wlan0
//If /var/lib/dhcpd/dhcpd.leases doesn't exist,
//we should establish it
//This file is used to record clients information.
[root@localhost ~]#touch /var/lib/dhcpd/dhcpd.leases
//Execute
[root@localhost ~]#/etc/rc.d/init.d/dhcpd start