DHCP problems in 12.3.14T on 1721

Discussion in 'Cisco' started by Ronald de Leeuw, Apr 16, 2005.

  1. I have a Cisco 1721 with 32MB flash and 96MB RAM running IOS 12.3.14T1
    IP/ADSL/FW/IDS PLUS IPSEC 3DES with VPN module and a WIC-1ENET.

    Interface Ethernet0 is configured as follows:

    interface Ethernet0
    ip address dhcp
    ip access-group ACL_Ethernet0_IN in
    ip access-group ACL_Ethernet0_OUT out
    no ip redirects
    no ip unreachables
    no ip proxy-arp
    ip nbar protocol-discovery
    ip nat outside
    ip inspect FW_Ethernet0_IN in
    ip inspect FW_Ethernet0_OUT out
    ip ips IPS_Ethernet0_IN in
    ip virtual-reassembly
    ip route-cache same-interface
    ip route-cache policy
    ip route-cache flow
    full-duplex
    no cdp enable
    crypto map CMP_CVPN
    end

    I'm unable to get an IP address assigned to this interface using DHCP. A
    'debug dhcp det' gives the following output:

    000229: Apr 15 09:19:03.754 GMT+1: DHCP: SDiscover: sending 289 byte length
    DHCP packet
    000230: Apr 15 09:19:03.754 GMT+1: DHCP: SDiscover 289 bytes
    000231: Apr 15 09:19:03.758 GMT+1: B'cast on Ethernet0 interface
    from 0.0.0.0
    000232: Apr 15 09:19:03.782 GMT+1: DHCP: Received a BOOTREP pkt
    000233: Apr 15 09:19:03.782 GMT+1: DHCP: Scan: Message type: DHCP Offer
    000234: Apr 15 09:19:03.782 GMT+1: DHCP: Scan: Server ID Option: 82.161.60.1
    = 52A13C01
    000235: Apr 15 09:19:03.782 GMT+1: DHCP: Scan: Lease Time: 3600
    000236: Apr 15 09:19:03.782 GMT+1: DHCP: Scan: bad FQDN option len 3
    000237: Apr 15 09:19:03.782 GMT+1: DHCP: Error in pkt. punting
    000238: Apr 15 09:19:07.774 GMT+1: DHCP: QScan: Timed out Selecting state
    %Unknown DHCP problem.. No allocation possible
    000239: Apr 15 09:19:16.634 GMT+1: DHCP: Waiting for 55 seconds on interface
    Ethernet0

    The problem seems to be in lines 000236 and 000237. How can I resolve this?
    Is this a known bug?

    Ronald
    Ronald de Leeuw, Apr 16, 2005
    #1
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  2. Ronald de Leeuw

    Alexei Monastyrnyi

    Joined:
    Dec 14, 2007
    Messages:
    1
    Hey.
    Have just came across this message while troubleshooting the same debug output for Cisco LWAPP.

    In my case it was an ISC DHCP server sending IETF draft option "option fqdn.server-update true;" which would upset a client. Commenting that one out fixed the problem.

    For the IOS units there is a similar issue with such a debug routput:

    •CSCsb47557

    Symptom: DHCP fails with following message: "DHCP: Scan: bad FQDN option len 3."

    Conditions: The Option 81 response returned from the DHCP Server has no domain-name.

    Workaround: Include a domain-name in the Option 81 response from the DHCP Server

    The complete URL is here:
    http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123relnt/1800/rn1800yt.htm

    Might be of help as well.

    A.

    Alexei Monastyrnyi, Dec 14, 2007
    #2
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