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DHCP server never assisngs first 16 iPv4 addresses in a VLAN. Why?

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  • DHCP server never assisngs first 16 iPv4 addresses in a VLAN. Why?

    I understand from an article of MS Technet (see: http://technet.microsoft.com/en-us/l...=ws.10%29.aspx), that a DHCP server never assigns the first 16 IP addresses in the iPv4 range in a VLAN, as they are reserved. The first two make sense to me (x.x.x.0 and x.x.x.1). And what about x.x.x.255?

    What is the reason for keeping these reserved? Please advise.

  • #2
    Re: DHCP server never assisngs first 16 iPv4 addresses in a VLAN. Why?

    This is specific to Virtual Server so I suspect there is no reason apart from MS wanting to keep some IPs free
    Tom Jones
    MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+
    PhD, MSc, FIAP, MIITT
    IT Trainer / Consultant
    Ossian Ltd
    Scotland

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    • #3
      Re: DHCP server never assisngs first 16 iPv4 addresses in a VLAN. Why?

      Why microsoft create such reservations I don't know yet, there are 2 addresses reserved anyhow, and that is a) network address and b) broadcast address.
      Secondly 1 address is used for a gateway device.

      Basically there are per vlan 3 addresses used within each new VLAN.
      Marcel
      Technical Consultant
      Netherlands
      http://www.phetios.com
      http://blog.nessus.nl

      MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
      "No matter how secure, there is always the human factor."

      "Enjoy life today, tomorrow may never come."
      "If you're going through hell, keep going. ~Winston Churchill"

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