Re: blocking unallocated subnets

From: Rob Thomas (no email)
Date: Fri Dec 02 2005 - 15:14:11 EST

  • Next message: Daniel Senie: "Clueless anti-virus products/vendors (was Re: Sober)"

    Hi, Randy.

    ] > Another option is to automate the updates and leave the hard work
    ] > to us!
    ]
    ] the op was discussing port-specific filtering for dns only. could
    ] you explain how i can automake my /etc/ipfw.rules leaving the hard
    ] work to you? e.g.

    There are often subtle relationships when it comes to filtering.
    While the DNS name servers may have no such filters, they are
    unreachable due to filters on upstream routers. So we try to
    provide as wide a set of filters as possible.

    ] add deny udp from 203.49.118.0/24 to any 53

    Now that is a set of filters we don't make available. I'll see
    if I can create another page for IPFW filters. I should do the
    same for IPF as well.

    You could Zebra peer with the Bogon route-servers and accept
    these prefixes as null routes. I've used null routes on servers
    frequently, but I've not tried the combination before. Take it
    with a grain of salt. :)

    Thanks,
    Rob.

    -- 
    Rob Thomas
    Team Cymru
    http://www.cymru.com/
    ASSERT(coffee != empty);
    

  • Next message: Daniel Senie: "Clueless anti-virus products/vendors (was Re: Sober)"





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