Tng s? l?ng cc ?a ch? IP trn con trong tr?nh ph?c v? DHCP

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TRI?U CH?NG

B?n c? g?ng ? m? r?ng ph?m vi c?a b?n trong tr?nh ph?c v? DHCP, nhng khi b?n thay ?i trong ph?m vi cc Ph?m vi h?p tho?i thu?c tnh, b?n nh?n ?c l?i sau:
"D?y IP ? ?c thay ?i, nhng cha ?c lu. Ti?p t?c s? lo?i b? cc thay ?i. Ti?n hnh?"
L?a ch?n ho?c l "c" hay "khng" ny thng i?p gy ra khng c thay ?i ? ph?m vi hi?n c.

GI?I PHP

Bi vi?t ny m t? phng php m b?n c th? s? d?ng ? thay ?i s? IP cc my ch? trn b?t k? m?ng con c? th?. Ba phng php sau y ?c b?o hi?m:
  • Ph?n m? r?ng ph?m vi
  • Resubnetting
  • Superscoping

Ph?n m? r?ng ph?m vi

N?u b?n ? c m?t ph?m vi DHCP v ?a ch? b?t ?u v k?t thc ?a ch? khng hi?n nay bao g?m t?t c? ?a ch? cho m?ng con cho tr?c c?a b?n, b?n c th? tng s? l?ng cc ?a ch? trong ph?m vi b?ng cch m? r?ng ?a ch? b?t ?u ho?c ?a ch? k?t thc trong thu?c tnh c?a ph?m vi.

Cc v d? sau cho th?y m?t L?p c m?ng v?i cc thi?t ?t sau:
?a ch? m?ng con: 192.168.1.0
M?t n? m?ng con: 255.255.255.0
V d? ny mang l?i m?t m?ng l?i c?a cc my ch? 254 chi?m kho?ng cc ?a ch? t? 192.168.1.1 ? 192.168.1.254.

Ph?m vi b?n t?o c cc tnh ch?t sau:
B?t ?u ?a ch?: 192.168.1.50
K?t thc ?a ch?: 192.168.1.150
M?t n? m?ng con: 255.255.255.0
? tng s? l?ng cc ?a ch? c s?n cho khch hng, b?n c th? thay ?i ?a ch? b?t ?u ho?c k?t thc ?a ch? nh xa nh 1 v 254, tng ?ng.

Chu y Trong phin b?n tr?c c?a Dynamic Host Configuration Protocol (DHCP), b?n ph?i m? r?ng ?a ch? b?t ?u ho?c ?a ch? k?t thc trong gia s? 32. i?u ny khng c?n l tr?ng h?p n?u b?n ang ch?y Microsoft Windows NT 4.0 d?ch v? Gi 6 ho?c m?i hn.

N?u ph?m vi c?a b?n ? bao g?m ph?m vi ton b? v l hon ton ?c s? d?ng, b?n ch? c hai l?a ch?n khc: superscoping ho?c resubnetting. C? hai cc ty ch?n ny yu c?u b?n ph?i lm cho ki?n trc ? thay ?i c?a b?n m?ng.

n gi?n ch? c?n thay ?i cc tham s? ph?m vi DHCP khng cung c?p cho b?n b? cho thu. DHCP ch?y trn ?u trang c?a ki?n trc m?ng con m?ng c?a b?n v c th? bn tay ra ?a ch? Tuy nhin b?n mu?n. Lun lun ?i x? v?i s? c?n thi?t ? m? r?ng ph?m vi ?a ch? nh m?t m?ng con ki?n trc t?p ?u tin v quan tr?ng nh?t. Sau khi b?n quy?t ?nh ki?n trc ? s? d?ng, b?n c th? c?u h?nh DHCP cho ph h?p v?i thi?t k? m?ng c?a b?n.

Resubnetting

Resubnetting l cc th? t?c ?c ? ngh? cho tng m?t DHCP ph?m vi khi ph?m vi hi?n hnh ? hon ton tiu th? m?t n? m?ng con hi?n t?i. Tuy nhin, phng php ny ?i h?i b?n ph?i thay ?i t?t c? cc my ch? m?ng con v c?ng. N?u b?n c m?t ph?m vi ?a ch? m ? ch?y ra kh?i ?a ch? my ch? lu tr? c s?n, b?n c th? c th? thay ?i m?t n? m?ng con ? bao g?m m?t ph?n l?n cc ?a ch? my ch? lu tr?. Tuy nhin, n gi?n ch? c?n thay ?i m?t n? m?ng con ?i h?i r?ng t?t c? cc router v khc t?nh ?c giao cc my tnh ?c thi?t k? v t?t c? cc khch hng DHCP ? gia h?n c?a h? thu vi?c thu th?p cc thng s? m?i.

Ngoi ra, ton b? DHCP ph?m vi ho?c ph?m vi ?u tin ph?i b? xa b? v sau ti s? d?ng m?ng con m?i m?t n?. Ti?m nng cho cc ?a ch? trng l?p t?n t?i trong giai o?n ny n?u b?n lm khng th?c hi?n cc b?c ? ngn ch?n cho thu ?a ch? my s? d?ng khc c th? s? d?ng. M?c d t?t c? c?a ni trn h?y c?n th?n, resubnetting v?n c?n nh?ng khuy?n co th? t?c. C?u h?nh resubnetting t?o ra khng c chi ph b? sung vo cc m?ng con router ho?c c?ng, v gi? t?t c? cc my trn cng pht sng ?a ch?.

V d? sau cho th?y m?t m?ng con h?t v?i sau ci ?t:
?a ch? m?ng con: 192.168.1.0
M?t n? m?ng con: 255.255.255.0
i?u ny mang l?i m?t m?ng l?i cc 254 host v?i ?a ch? t? 192.168.1.1 ? 1921.68.1.254.

V d? sau cho th?y k?t qu? N?u b?n dng ty ch?n resubnetting:
?a ch? m?ng con: 192.168.1.0
M?t n? m?ng con: 255.255.254.0
By gi? b?n c m?t m?ng l?i cc ch? nh 510 v?i ?a ch? t? 192.168.0.1 ? 192.168.1.254 (?i v?i ph?m vi 192.168.0.0), ho?c 256 m?i c s?n ?a ch? DHCP.
Tr?c khi:
---------192.168.1.0/24-------R-------192.168.5.0/24---------

Sau khi:
---------192.168.0.0/23-------R-------192.168.5.0/24---------

Superscoping

Superscoping (c?ng ?c g?i l multinetting) c th? p ?ng c?a b?n yu c?u. N?u b?n khng mu?n thay ?i subnetting c?a m?t hi?n c m?ng, b?n c th? thm thm h?p l? m?ng v?t l? dy tng t?. i?u ny ?t m?t gnh n?ng thm trn router ho?c c?ng ?c c?u h?nh v?i nhi?u m?ng con h?p l? ch?y trn m?t c?ng v?t l? duy nh?t. Cc b? sung gnh n?ng c th? d?n ?n hi?u su?t gi?m m?ng. Cc my ch? trn m?t m?ng con h?p l? ph?i ?c ?nh tuy?n thng qua c?a ng? ? giao ti?p v?i my ch? bn kia m?ng con h?p l?, m?c d chia s? cng m?t v?t l? dy.

Cc V d? sau cho th?y m?t m?ng con h?t v?i cc thi?t ?t sau:
?a ch? m?ng con: 192.168.1.0
M?t n? m?ng con: 255.255.255.0
V d? sau cho th?y cc k?t qu? n?u b?n s? d?ng cc superscoping ty ch?n:
?a ch? m?ng con: 192.168.1.0 v 192.168.2.0
M?t n? m?ng con: 255.255.255.0
By gi? b?n c hai m?ng c?a 254 Host (t?ng c?ng 508 Host) v?i ?a ch? t? 192.168.1.1 ?n 192.168.1.254 v 192.168.2.1 ? 192.168.2.254, ho?c 254 v?a ?c s?n DHCP ?a ch?.
Tr?c khi:
-----192.168.1.0/24------R-----192.168.5.0/24--------

Sau khi:
-----192.168.1.0/24 v 192.168.2.0/24-----R-----192.168.5.0/24------
Sau khi b?n quy?t ?nh l?a ch?n m b?n mu?n s? d?ng, b?n c th? ch?n cc c?u h?nh DHCP tng ?ng.

N?u b?n s? d?ng resubnetting ty ch?n, b?n c?n ph?i xo v t?o l?i ph?m vi DHCP v?i m?ng con m?i m?t n? (n l khng th? thay ?i ch? m?t n? cho m?t ph?m vi c? th?). N?u b?n ang ph?c v? khch hng hi?n c trong m?t ph?n c?a ph?m vi ny, b?n nn b?t pht hi?n xung ?t cho ?n khi t?t c? cc khch hng c?a b?n ang di c vo cc m?i ph?m vi. Hnh ?ng ny ?i h?i b?n ph?i th?c hi?n theo cc b?c sau:
  1. C?u h?nh giao di?n c?a m?i b? ?nh tuy?n ?c k?t n?i v thay ?i ?a ch? IP cho giao di?n k?t n?i, ?a ch? m?ng con c?a n, v m?ng con m?t n?.
  2. Xo c?a b?n DHCP ph?m vi hi?n hnh.
  3. T?o ra m?t ph?m vi DHCP m?i v?i m?ng con m?i m?t n?.
  4. Cho php xung ?t Retries ty ch?n trn my ch? DHCP (t?p 1 ho?c 2).
  5. L?c l?ng c?a b?n khch hng DHCP ? lm m?i c?a h? DHCP cho thu.
  6. Thay ?i cc ?a ch? IP, m?t n? m?ng con, v c?ng n?i m?c ?nh trn m?i my ch? c?u h?nh t?nh.
Khi b?n s? d?ng ty ch?n superscoping, b?n c?n ph?i superscope m?t s? l?ng cc ph?m vi v?i nhau. T?o ra ph?m vi m?i c nhn v sau t?o ra m?t superscope ? k?t h?p cc ph?m vi c nhn. Hnh ?ng ny c?n thi?t b?n th?c hi?n theo cc b?c sau:
  1. Thm ?a ch? IP th? c?p ? b? ?nh tuy?n hi?n t?i giao di?n.
  2. T?o ra m?t ph?m vi DHCP m?i cho cc m?i h?p l? m?ng con.
  3. T?o ra m?t superscope v thm cc c? v m?i DHCP ph?m vi nh tr? em.

Thu?c tnh

ID c?a bi: 255999 - L?n xem xt sau cng: 21 Thang Tam 2011 - Xem xt l?i: 2.0
p d?ng
  • Microsoft Windows NT Server 4.0 Standard Edition
  • Microsoft Windows 2000 Server
  • Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
  • Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
  • Microsoft Windows Server 2003, Standard Edition (32-bit x86)
T? kha:
kbinfo kbnetwork kbmt KB255999 KbMtvi
My d?ch
QUAN TRONG: Bi vi?t ny ?c d?ch b?ng ph?n m?m d?ch my c?a Microsoft ch? khng ph?i do con ng?i d?ch. Microsoft cung c?p cc bi vi?t do con ng?i d?ch v c? cc bi vi?t do my d?ch ? b?n c th? truy c?p vo t?t c? cc bi vi?t trong C s? Ki?n th?c c?a chng ti b?ng ngn ng? c?a b?n. Tuy nhin, bi vi?t do my d?ch khng ph?i lc no c?ng hon h?o. Lo?i bi vi?t ny c th? ch?a cc sai st v? t? v?ng, c php ho?c ng? php, gi?ng nh m?t ng?i n?c ngoi c th? m?c sai st khi ni ngn ng? c?a b?n. Microsoft khng ch?u trch nhi?m v? b?t k? s? thi?u chnh xc, sai st ho?c thi?t h?i no do vi?c d?ch sai n?i dung ho?c do ho?t ?ng s? d?ng c?a khch hng gy ra. Microsoft c?ng th?ng xuyn c?p nh?t ph?n m?m d?ch my ny.
Nh?p chu?t vo y ? xem b?n ti?ng Anh c?a bi vi?t ny:255999

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