housekeeping

docs/Guides/linux_dhcp_server_notes.txt

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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