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Vlan dhcp problem? Option 82?

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  • Vlan dhcp problem? Option 82?

    Here is the catalyst 3560 conf file:

    interface Vlan25
    description Test
    ip address 192.168.25.1 255.255.255.0
    ip helper-address 192.168.0.14
    ...

    no ip forward-protocol udp tftp
    no ip forward-protocol udp tacacs

    ...

    sw_core#sh ip interface vlan25
    ...
    Vlan65 is up, line protocol is up
    Internet address is 192.168.25.1/2
    Broadcast address is 255.255.255.2
    Address determined by non-volatile
    MTU is 1500 bytes
    Helper address is 192.168.0.14
    Directed broadcast forwarding is disabled
    ...
    ...
    "
    I have dhcp server on Microsoft win server 2003 (192.168.0.14). It works fine for non vlan network. I have created vlan 25, and associate LAN scope to it - 192.168.65.x. My clients are XPs. Dynamics DHCP allocation works fine for laptops, but it does not work for some of my computers. I have tried everything to reset TCP/IP stack etc.... with of no avail.
    Then I have tried to trace dcp server with ethreal:

    When I type the command: ipconfig /renew

    I have on ethreal screen monitoring dhcp server:
    1.
    0.0.0.0 255.255.255.255 DHCO discover

    but when I use xp support command dhcplock and type d (for discover) I have :
    169.254.112.153 255.255.255.255 DHCP discover
    192.168.25.1 255.255.255.255 DHCP offer
    So where is the problem? I do not have slightest idea what to do next!

    Is there some possibility that I have to set server for Option 82?

  • #2
    Re: Vlan dhcp problem? Option 82?

    Strange. So some get an IP, some dont?

    I would think either-
    1. You're out of IP addresses in the scope
    2. You may have to set portfast on some of your access ports- some of the NICs and their machines might not be as quick as others.
    hth

    genkidesu

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