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New Member

VLSM

I thought I understood VLSM until I got to the situation below. What is the procedure/proccess in assigning IP address 192.168.24.0/22 to following networks?

RouterA is connected to 3 other wan routers, B,C,D via serial.

routerA has 50 hosts on its lan.

routerB has 400 hosts on its lan.

routerC has 50 hosts on its lan.

routerD has 200 hosts connected to its lan.

Thanks.

Said

1 ACCEPTED SOLUTION

Accepted Solutions

Re: VLSM

Hi,

you could use:

router A: 192.168.24.0/25 (126 hosts)

router B: 192.168.26.0/23 (508 hosts)

router C: 192.168.24.128/25 (126 hosts)

router D: 192.168.25.0/24 (254 hosts)

Make sure your routing protocoll can handle this.

Regards

Martin

6 REPLIES
Cisco Employee

Re: VLSM

You need to use a subnet length that will satisfy the minimum requirements.

Here's one example you could follow:

RouterA 192.168.24.0/26 (provides 64 addresses)

RouterB 192.168.26.0/23 (provides 512 addresses)

RouterC 192.168.24.64/26 (provides 64 addresses)

RouterD 192.168.28.0/24 (provides 256 addresses)

Hope this helps,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

Re: VLSM

Hi Harold,

so I was half as fast as you were ... are you a double CCIE? ;-)

Regards

Martin

Cisco Employee

Re: VLSM

LOL!! I am indeed but I don't know if it comes and reinforces your theory.

Cheers,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
Cisco Employee

Re: VLSM

BTW: I just noticed I made a mistake :o( I went beyond the /22 assignment in my previous posting.

Here's a correction:

RouterA 192.168.27.0/26 (64 addresses).

RouterB 192.168.24.0/23 (512 addresses).

RouterC 192.168.27.64/26 (64 addresses)

RouterD 192.168.26.0/24 (256 adresses).

Hope this helps,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

Re: VLSM

Hi,

you could use:

router A: 192.168.24.0/25 (126 hosts)

router B: 192.168.26.0/23 (508 hosts)

router C: 192.168.24.128/25 (126 hosts)

router D: 192.168.25.0/24 (254 hosts)

Make sure your routing protocoll can handle this.

Regards

Martin

New Member

Re: VLSM

um, how do you get 508 hosts. (2^9)-2=510

have i missed something here?

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