Variable Length Subnet Mask(VLSM) 可變長度子網路切割 王振生. Variable Length Subnetting ‣ VLSM allows us to use one class C address to design a networking scheme.

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Presentation transcript:

Variable Length Subnet Mask(VLSM) 可變長度子網路切割 王振生

Variable Length Subnetting ‣ VLSM allows us to use one class C address to design a networking scheme to meet the following requirements: ‣ Taipei60 users ‣ Kaohsiung28 users ‣ Taichung 12 users ‣ Tainan 12 users ‣ WAN links between each router

Networking Requirements Taipei 60 users Taichung 12 users Tainan 12 users Kaohsiung 28 users WAN 1 WAN 2 WAN 3 If a /26 was used to provide 60 addresses for LANs. There are no addresses left for WAN links Classful subnetting is very wasteful.

VLSM Design Scheme Name/required addresses Subnet address Address rangeBroadcastAddress/subnet Taipei/ Kaohsiung/28 Taichung/12 Tainan/12 WAN1/2 WAN2/2 WAN3/2

VLSM Design Scheme Name/required addresses Subnet address Address rangeBroadcastAddress/subnet Taipei/ /26 Kaohsiung/28 Taichung/12 Tainan/12 WAN1/2 WAN2/2 WAN3/2

VLSM Design Scheme Name/required addresses Subnet addressAddress rangeBroadcastAddress/subnet Taipei/ /26 Kaohsiung/ /27 Taichung/12 Tainan/12 WAN1/2 WAN2/2 WAN3/2

VLSM Design Scheme Name/required addresses Subnet addressAddress rangeBroadcastAddress/subnet Taipei/ /26 Kaohsiung/ /27 Taichung/ /28 Tainan/12 WAN1/2 WAN2/2 WAN3/2

VLSM Design Scheme Name/required addresses Subnet addressAddress rangeBroadcastAddress/subnet Taipei/ /26 Kaohsiung/ /27 Taichung/ /28 Tainan/ /28 WAN1/2 WAN2/2 WAN3/2

VLSM Design Scheme Name/required addresses Subnet addressAddress rangeBroadcastAddress/subnet Taipei/ /26 Kaohsiung/ /27 Taichung/ /28 Tainan/ /28 WAN1/ /30 WAN2/2 WAN3/2

VLSM Design Scheme Name/required addresses Subnet addressAddress rangeBroadcastAddress/subnet Taipei/ /26 Kaohsiung/ /27 Taichung/ /28 Tainan/ /28 WAN1/ /30 WAN2/ /30 WAN3/2

VLSM Design Scheme Name/required addresses Subnet addressAddress rangeBroadcastAddress/subnet Taipei/ /26 Kaohsiung/ /27 Taichung/ /28 Tainan/ /28 WAN1/ /30 WAN2/ /30 WAN3/ /30

Networking Scheme Taipei/ /26 Taichung/ /28 Tainan/ /28 Kaohsiung/ /27 WAN /30 S1/0.129 S1/.130 S1/2.133 S1/1.137 WAN /30 WAN /30 S1/.138 F0/.65 F0/.113 F0/.97 E0/0.1 S1/.134

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