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DHCP

Dynamic Host ConfgurationProtocol

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Ce reprezinta protocolulDHCP?

 Protocolul DHCP permite asignareaautomata a unui IP unui client alserverului de DHCP. Astel clientul nutrebuie sa mai introduca setarile de IP,ate!ay, D"#, ci ele sunt preluateautomat de la un server din retea la care

clientul are acces.

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Pina la aparitia DHCP

Asignarea manuala a parametrilor

de confgurare a retelei $%%&P '$ootstrap Protocol(

Protocol de retea, utilizat pentru asignarea

adreselor IP a clientilor conectati la retea.)oloseste protocolul de transport *DP pentrucumunicarea client+server.

 

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 &rasaturile DHCP

)urnizeaza parametrii de confgurarecatre osturi prin intermediul retelei

Aloca dinamic adresele IP

Interventii minimale a administratorilorde retea

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Concretizari

'DHCP( -esa / DHCP+PD*'protocol dataunit(

Client / DHCP Client

#erver / DHCP #erver Porturi utilizate

DHCP #erver0 *DP port 12

DHCP Client0 *DP port 13

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 &ipuri de mesae DHCP

-esa DHCP )unctia

  DHCPDI#C%456 Clientul cauta servere DHCP

  DHCP%))56 #erver++7Client -esa cu parametrii de confgurare

  DHCP658*5#& Clientul cere parametrii de confgurare

  DHCPD5C9I"5 Client +7 #erver In caz ca IP+ul primit dea este alocat inretea

  DHCPAC:  #erver++7Client raspuns de confrmare a cererii

  DHCP"A:  #erverClient respingerea cererii de transmitere a

parametrilor

  DHCP6595A#5 Client#erver -esa de reuz de la IP+ul alocat

  DHCPI")%6- Client#erver Cererea parametrilor de confgurare

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5;emplu de retea

6outer

Internet

DHCP

#erver

*DP Port13

*DP Port13

*DP Port13

*DP Port12

ClientiDHCP

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Algoritmul obtinerii setarilor

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9ease &imes 'perioada decirie(

Poate dura de la <= minute > < an #etari implicite

<= minute0 In cazul unui numar mareosturi

zile0 -icrosot implicit 'deault(

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6einnoiirea periodica a parametrilor deconfgurare. 9ease &ime 'Client( 

 &< @ & @ 9ease time  &< deault value / <B din lease time

 & deault value / 2B3 din lease time

Actiunile clientului cind timpul e;pira  &<0 clientul trebuie sa+si confrme adresa IP cu

serverul DHCP de la care a primit parametrii decon.

 &0 clientul trebuie sa+si reinnoiasca adresa IPcu oricare server DHCP din retea 9ease time0 clientul trebuie sa+si scimbe

adresa IP

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6eiinnoirea parametrilor de confgurare'Algoritm(

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DHCP PD* )ormat%peration

Code'<byte(Hard!are &ype

'<byte(

Hard!are 9engt

'<byte(

Hop Count

'<byte( &ransaction ID'bytes(

#econds 5lapsed'bytes( -ust $e ero '-$( 'bytes(

Client IP address'bytes(

 Eour IP address'bytes(

#erver IP address'bytes(

6elay agent IP address'bytes(

Client ard!are address

'<1 bytes(

#erver ost name

'1 bytes(

$oot fle name

'<3 bytes(

%ptions

'up to < bytes(

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Demonstrare