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AIM :Configure DHCP and DNS

1. When client wants to get ip address ia DHCP! it generates dhcp discoer.

"he client #roadcasts a DHCPDISC$%&' (essage on its local ph)sical su#net.

"he DHCPDISC$%&' (essage (a) include options that suggest alues for the networ* address and

lease

duration.DHCPDISC$%&' is a +DP #roadcast (essage t)pe.

,. $ne or (ore serers (a) answer on it with dhcp offer.

&ach serer (a) respond with a DHCP$--&' (essage that includes an aaila#le networ* address in the

ipaddr field /and other configuration para(eters in DHCP options0."he serer unicasts the DHCP$--&' (essage to the client /using the DHCP2$$"P rela) agent if 

necessar)0 if possi#le! or (a) #roadcast the (essage to a #roadcast address /prefera#l) ,33.,33.,33.,330

on the client4s su#net.

5. When client choice fro( what serer it want ip address! and generate dhcp re6uest! in which set ip

address

selected serer.

"he client chooses one repl) and responds to the serer with aDHCP'&7+&S".

DHCP'&7+&S" is a +DP #roadcast (essage t)pe.

8. "he serer ac*nowledges the re6uest with a DHCPAC9.

Features of DHCP:1. DHCP (essages fro( a client to a serer are sent to the DHCP serer port /+DP port ;0! and DHCP

(essages fro( a serer to a client are sent to the DHCP client port /+DP port

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;. ipconfigrelease co((and is used to ter(inate a PC@s DHCPassigned lease

Domain Name System"he Do(ain Na(e S)ste( /DNS0 is the crucial glue that *eeps co(puter networ*s in har(on)

 #) conerting hu(anfriendl) hostna(es to the nu(erical IP addresses co(puters re6uire to

co((unicate with each other. DNS is one of the largest and (ost i(portant distri#uted data#asesthe world depends on #) sering #illions of DNS re6uests dail) for pu#lic IP addresses. Most pu#lic DNS serers toda) are run #) larger ISPs and co((ercial co(panies #ut priate DNS

serers can also #e useful for priate ho(e networ*s.