[pox-dev] forwarding.l2_learning module giving warning for DHCP packets.

[Karthik Sharma]

I have 4 virtual Machine (Ubuntu 12.04) running on a host that is also
running Ubuntu 12.04
The Virtual Machines are named as

    vm-1
    vm-2
    vm-3
    switch-vm

Below are the network settings on switch-vm


    Adapter 1:

    Intel PRO/1000 MT Desktop (Bridged adapter, eth0)
    Adapter 2:

    Intel PRO/1000 MT Desktop (Internal network, 'intnet-1')
    Adapter 3:

    Intel PRO/1000 MT Desktop (Internal network, 'intnet-2')
    Adapter 4:

    Intel PRO/1000 MT Desktop (Internal network, 'intnet-3')


Network settings on vm-1



    Adapter 1:

    Intel PRO/1000 MT Desktop (Bridged adapter, eth0)
    Adapter 2:

    Intel PRO/1000 MT Desktop (Internal network, 'intnet-1')

Network settings on vm-2

    Adapter 1:

    Intel PRO/1000 MT Desktop (Bridged adapter, eth0)
    Adapter 2:

    Intel PRO/1000 MT Desktop (Internal network, 'intnet-2')


Network settings on vm

    Adapter 1:

    Intel PRO/1000 MT Desktop (Bridged adapter, eth0)
    Adapter 2:

    Intel PRO/1000 MT Desktop (Internal network, 'intnet-3')


I have installed ovs and pox controller on switch-vm

    sudo ovs-vsctl show
    sudo ovs-vsctl add-br lan0
    sudo ovs-vsctl add-port lan0 eth1
    sudo ovs-vsctl add-port lan0 eth4
    sudo ovs-vsctl add-port lan0 eth5

    sudo ovs-vsctl set-controller lan0 tcp:127.0.0.1:6633

    ./pox.py log.level --DEBUG forwarding.l2_learning


The output is as follows

    POX 0.1.0 (betta) / Copyright 2011-2013 James McCauley, et al.
    DEBUG:core:POX 0.1.0 (betta) going up...
    DEBUG:core:Running on CPython (2.7.3/Aug 1 2012 05:14:39)
    DEBUG:core:Platform is
Linux-3.5.0-23-generic-x86_64-with-Ubuntu-12.04-precise
    INFO:core:POX 0.1.0 (betta) is up.
    DEBUG:openflow.of_01:Listening on 0.0.0.0:6633
    INFO:openflow.of_01:[08-00-27-1a-f8-a5 1] connected
    DEBUG:forwarding.l2_learning:Connection [08-00-27-1a-f8-a5 1]
    INFO:packet:(dhcp parse) warning DHCP packet data too short to parse
header: data len 86
    INFO:packet:(dhcp parse) warning DHCP packet data too short to parse
header: data len 86
    INFO:packet:(dhcp parse) warning DHCP packet data too short to parse
header: data len 86
    INFO:packet:(dhcp parse) warning DHCP packet data too short to parse
header: data len 86
    INFO:packet:(dhcp parse) warning DHCP packet data too short to parse
header: data len 86

Why is this error coming?

Regards,
Karthik.