(B15) Windows Server part12 DHCP Server- LeaseDuration, Reservation, APIPA, Troubleshooting
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Lease Duration/period
-time period to client having ip address
-client must renew at 50% total lease duration
-client user Request and Ack of DORA process
-client renewed lease duration - means time extends for expire
-if client failed to renew at 50% of lease duration , renew process
starts again at 87.5% of lease duration
-if client failed to renew and lease period is completed
server remove the entry in address lease list
-client to get ip address from server, client use DORA process again
client may or may not get same ip address
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Reservation:
-client may get different ip addresses every time
-if a client device required to get same ip address when every it connected
-we can reserve some ip address for that client , using MAC of client
-Reserved ip address can be exclude range, scope range , out of scope range
mac:00-0c-29-b5-20-e4
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1. if you change your network, ip address must update automatically
2. if you dont ip address from dhcp server
-issue network , dhcp scope completed, dhcp service , server down
-if your not get ip address from dhcp server the system assign an ip address to itself
in APIPA RANGE :169.254.0.0 - 169.254.255.255
169.254.0.0
169.254.0.1 - 169.254.255.254
169.254.255.255
apipa means error
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-check network, dhcp server, try solve the issue
-once fixed you will get ip address from dhcp server
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--if your system ip address not update
1. Disable/Enable Network Adaptor
2. cmd : ipconfig /release -- remove current ip address (Dynamic, not static)
ipconfig /renew -- try get ip address from dhcp server
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Mac Bind:
-
-can change mac address for a device? no
-mac spoof - duplicate mac address for security , trafic redirect,..hacking...
-can we able to communicate with mac address ? no
-all communication by ip address only.
MAC work for local lan communication only
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list mac address in the wifi router
allow connection only if mac address in list
-verify the mac address check the list - match connect .
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