—–Export all leases
netsh dhcp server dump > test.csv
—Subnet delay in milliseconds
If you have 2 DHCP Servers, you can make the secondary one have a 10ms delay
this will mean that the primary server always responds to the Broadcast DORA.
—Parent Domain
Automatically add the domain name cisco.com when accessing server hostnames
eg. Ping websrv will ping websrv.cisco.com
—DORA
Discovery – udp 67
—WDS
listens on udp port 67 for PXE boot requests.
Cannot listen on udp 67 if installed on the DHCP server which is already using
this port.
—Filters
Only allow this mac address
deny this MAC address. //Can type BC* = BC:XX:XX:XX:XX
—DHCP Duplicate detection
If you want Host machines to ping the DHCP IP address before using a new leased
IP address do this
//Configuration
IPV4-> Properties -> Advanced -> Conflict detection Attempts = 1
—Backup / Restore
//Configuration
right click scope – backup
Right click scope – Restore
Right click scope – Reconcile
—Relay DHCP
Instead of the ip helper-address on the cisco vlan/interface we can configure a MS server
to relay the DHCP DORA requested to the AD server.
//Configuration
1. Install Remote Access
2. Roles “Routing and remote access”
3. Start the service routing and remote access in services.msc
4. Lauch Routing and remote access
5. Click Configure and Enable routing and remote access
6. Choose LAN-Routing
7. IPv4 -> New routing protocol -> DHCP Relay
8. DHCP Relay Agent -> Properties Add DHCP server
9. Add interface Ethernet5
—Failover
Maximium client lead time = Max lease time + Padding
//Load Balancing configuration
1. Assign a static IP to the DHCP Servers. Note required a Reboot.
2. On the primary right click IPv4 -> Configure Failover
3. choose your subnets + enter the hostname of the secondary peer.
4. Configure the switchover interval eg 5mins
IPv4 -> Properties -> Failover Edit -> State switchover interval
5. On the vlan interface/default gateway
-ip helper-address 1.1.1.1
-ip helper-address 2.2.2.2
//Active\Standby configuration
1. Assign a static IP to the DHCP Servers. Note required a Reboot.
2. On the primary right click IPv4 -> Configure Failover
3. choose your subnets + enter the hostname of the standby peer.
4. Configure the switchover interval eg 5mins + HotStandby mode
IPv4 -> Properties -> Failover Edit -> State switchover interval
5. On the vlan interface/default gateway
-ip helper-address 1.1.1.1
-ip helper-address 2.2.2.2
—Maximium client lead time
Configure a time maximium for the DHCP lease.
Eg even if set to 8 days the failover lead time configured here will over-ride the time
IPv4 -> Properties -> Failover -> Edit -> Maximium client lead time
—Migrate DHCP Server
Export the DHCP role
1. export-dhcpserver -file C:\1.xml
Import the DHCP role
—DHCP Policies
//Scope Policy
Based on the MAC address or hostname we can allocate a certain range of IP addresses.
Note this overrides any server policy.
DHCP manager -> IPv4 -> Scope 10.0.0.0 -> Policies -> Add
//Server Policy
Applies to all scopes, unsure where to configure it.
2. import-dhcpserver -file C:\1.xml
—DHCPv6 Ipv6
- Put a static IPv6 on the server -> 2001::5
- Configure the routeripv6 unicast routingint vlan 90ipv6 2001::1/64
- Win7Ipconfig /release6Iponcig /renew6
- Obtain the Details for reservation
ipconfig /all | more
DHCPv6 IAID – 50337117
DHCPv6 Client DUID – Format
00
01000115F97FABF0DEF17A005E