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Access network design for branch, remote, outdoor, and campus locations with HPE Aruba Networking access points and mobility controllers.
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Wireless clients get DHCP addresses from the wrong IP range

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  • 1.  Wireless clients get DHCP addresses from the wrong IP range

    Posted Nov 02, 2012 05:54 AM
      |   view attached

    Hi guys!

     

    This is my first post, and I hope you guys can help me with this issue. We sold an Aruba solution using Instant Access Points, Airwave, Aruba S2500 POE switches and ClearPass onboard to a customer with 22 site locations. We are ripping and replacing an HP switch/wifi based solution, with a complete Aruba solution. We now have an issue on a site where we are forced to run parallel infrastructure before we can remove and replace all the old HP kit.

     

    Our Instant 105 AP's are configured for VLAN 17 (the management VLAN) and our switches are also in VLAN 17. So all the AP's and switches get management IP's as assigned in VLAN 17. The Instant Virtual Controller's IP address is assigned statically in VLAN 17, while the member AP's get their IP's assigned dynamically in VLAN 17. The switches all have their management IP's assigned statically in VLAN 17. We then have an existing VLAN 1 (the default VLAN) that provides DHCP to the users on the network. Our S2500 switch is connected from its port 23 to the existing HP Procurve's port 7.

     

    Here is the port confihuration for port 7 on the HP procurve:

     

    Server Room# sh vlans ports 7 detail

     

    Status and Counters - VLAN Information - for ports 7

     

      VLAN ID Name                 | Status     Voice Jumbo Mode

      ------- -------------------- + ---------- ----- ----- --------

      1       DEFAULT_VLAN         | Port-based No    No    Tagged

      17      network_man          | Port-based No    No    Tagged

     

    Our problem is that we created SSID's on the Instant AP's, and tagged them for VLAN 1, but when a user connects to the SSID, he gets assigned an IP address from the VLAN 17 IP range, instead of the VLAN 1 IP range.

     

    Here is the configuration for the Aruba S2500 switch:

     

    (Aeroton) #show interface gigabitethernet 0/0/23

     

    GE0/0/23 is administratively Up, Link is Up, Line protocol is Up

    Hardware is Gigabit Ethernet, Interface is GE0/0/23, Address is 00:1a:1e:0b:be:59

    Encapsulation ARPA, Loopback not set

    Configured: duplex (Auto), Speed (Auto), FC (Off), Autoneg (On)

    Negotiated: duplex (Full), Speed (100 Mbps)

    Interface index: 24

    MTU 1514 bytes

    Link flaps: 0

    Flags: Trunk, Trusted

    Link status last changed: 0d 00:02:06 ago

    Last update of counters: 0d 00:00:04 ago

    Last clearing of counters: 0d 00:02:31 ago

    Statistics:

    Received 2934 frames, 421315 octets

    58 pps, 74.265 Kbps

    1657 unicast, 332 multicast, 945 broadcast

    0 runts, 0 giants, 0 throttles

    0 error octets, 0 CRC frames

    Transmitted 2122 frames, 1593510 octets

    47 pps, 98.656 Kbps

    1999 unicast, 80 multicast, 43 broadcast

    0 throttles, 0 errors octets, 0 deferred

    0 collisions, 0 late collisions

    PoE Information:

    Administratively Enable, Port status: Off, Power consumption: 0 mW

    PSE port status: Off, PD detection in progress

     

    (Aeroton) #

    (Aeroton) #

    (Aeroton) #

    (Aeroton) #

    (Aeroton) #

    (Aeroton) #

    (Aeroton) #show vlan 1 detail

     

    U - Untagged member, T - Tagged member

    * - Active interface

     

    Dot1q tag: 1, Description: DEFAULT_VLAN

    Number of interfaces: 26, Active: 2, Non-Blocking: 2

    VLAN membership:

    Access:

    GE0/0/6(U) GE0/0/7(U) GE0/0/8(U) GE0/0/9(U)

    GE0/0/10(U) GE0/0/11(U) GE0/0/12(U) GE0/0/13(U)

    GE0/0/14(U) GE0/0/15(U) GE0/0/16(U) GE0/0/17(U)

    GE0/0/18(U) GE0/0/19(U) GE0/0/20(U) GE0/0/21(U)

    GE0/0/22(U) GE0/1/0(U) GE0/1/1(U)

    Trunk:

    GE0/0/0*(T) GE0/0/1(T) GE0/0/2(T) GE0/0/3(T)

    GE0/0/4(T) GE0/0/5(T) GE0/0/23*(U) GE0/0/23*(T)

     

    Guys, I'd appreciate your help. Please excuse my poor English, it is not my first language :-)

     

    Thomas



  • 2.  RE: Wireless clients get DHCP addresses from the wrong IP range

    EMPLOYEE
    Posted Nov 02, 2012 12:52 PM

    I tried for a few minutes to peice together the network topology, but I am in a meeting and can't figure it out with the distractions. It souds like an L2 connection between VLAN 17 and 1 is transposed somewhere in the path. A good test would be to configure an access port in VLAN 1 on the Aruba switch and see if the wired device gets an IP out of VLAN 17 or VLAN 1. If you get an IP out of 17, then it's a wired issue up the path. If you get it out of VLAN 1, then it's an Instant configuration problem.