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Can I use one subnet in two vlan with different IP

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  • Can I use one subnet in two vlan with different IP

    Hi all,

    I have cisco 4506 core switch configured and ip helper-address pointing to my DHCP server. Its running for several years. All ip address in vlan has now been occupied. I need more IP. Here is my current senario:

    VLAN 5
    ip address 10.143.8.1 255.255.255.128
    ip helper-address 10.143.8.24

    VLAN 100
    ip address 10.143.12.1 255.255.252.0
    ip helper-address 10.143.8.24

    VLAN 105
    ip address 10.143.10.1 255.255.254.0
    ip helper-address 10.143.8.24

    ip route 0.0.0.0 0.0.0.0 10.143.8.1
    ip route 10.143.8.1 255.255.255.128 vlan5
    ip route 10.143.10.1 255.255.255.128 vlan100
    ip route 10.143.12.1 255.255.255.128 vlan105


    I got total 126 hosts in vlan 5, 1022 host in vlan 100 and 510 host in vlan 105
    Now I run out of IP. I have few questions regarding my issue.

    1. Can I use same subnet 255.255.255.128 (mentioned in vlan5) in new vlan 6 with different IP?
    2. I use subnet calculator to get 10.143.7.1/255.255.255.128 Can I configure new vlan 6 in my core switch set ip address 10.143.7.1 subnet mask 255.255.255.128 and add another scope in super scope in DHCP?
    3. Do I need to do any other thing?

    Please help me to sort this out.

    Regards,
    Raihan

  • #2
    Re: Can I use one subnet in two vlan with different IP

    Sorry I answered my question. Itís possible.

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