Re: Ipfw accept rule

From: Jon Simola (jon_at_abccom.bc.ca)
Date: 09/23/04

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    Date: Thu, 23 Sep 2004 09:44:37 -0700 (PDT)
To: Bikrant Neupane <bikrant_ml@wlink.com.np>

    On Thu, 23 Sep 2004, Bikrant Neupane wrote:

    > Here is my rule set:
    >
    > #skip dependind the pkt layer
    > 01000 322 14780 skipto 10000 ip from any to any layer2 in via xl0
    > 01100 200 93204 skipto 20000 ip from any to any not layer2
    >
    > #rule num 10000 to 20000 allocated for layer2 filtering
    > #for mac filter: allow only listed mac to send traffic
    > 10000 39 1780 allow ip from any to any MAC any 00:00:0e:84:00:83 in via
    > xl0
    > #default deny all mac coming in from xl0
    > 19997 284 13046 deny ip from any to any MAC any any in via xl0

    If this is layer2 filtering, where are the layer2 tags in the ipfw rule?
    And if this is the extent of your layer 2, then don't forget an allow/deny
    default for layer2 packets (allow ip from any to any layer2). Also, you're
    only checking your layer2 on a specific interface, perhaps you only have
    one.

    I've got something like:
    00010 skipto 32000 ip from any to any not layer2
    00050 deny ip from any to any MAC any 00:30:da:00:00:00/24 layer2 in
    00055 count ip from any to any MAC any 00:0b:db:1d:63:56 layer2 in // sniffing for traffic
    03100 allow ip from any to any layer2
    // bandwidth monitoring pipes
    32003 pipe 3 ip from any to any src-ip 10.10.66.0/24 in recv em1
    32004 pipe 4 ip from any to any dst-ip 10.10.66.0/24 out xmit em1
    65534 allow ip from any to any
    65535 deny ip from any to any 

    ---
Jon Simola <jon@abccom.bc.ca> | "In the near future - corporate networks
    Systems Administrator     |  reach out to the stars, electrons and light
     ABC  Communications      |  flow throughout the universe." -- GITS
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