IP directed-broadcast

Discussion in 'Cisco' started by VNTHOMAS, Nov 12, 2003.

  1. VNTHOMAS

    VNTHOMAS Guest

    Hello

    I have following setup with all interfaces disabled for ip
    direct-broadcast and routers are running 12.2.15T5

    --e0(172.16.1.0/24)-Router1-e1--(172.16.12.0/24)--e0-Router2---e1(172.16.2.0/24).

    When I ping from Router1 to either 172.16.2.0 or 172.16.2.255, Router2
    responds and vice-versa; when Router2 pings eihter 172.16.1.0 or
    172.16.1.255,Router1 responds.

    I was told the following - If the destination network is directly
    attached and ip forward directed-broadcasts is disabled then the
    router replies on behalf of the subnet but does not forward the
    broadcast out onto the subnet.

    However I have another router running 12.2.8T5(IP/FW/IDS PLUS IPSEC
    3DES) which does not respond to such broad-cast addresses.

    Which is normal behaviour? If it is not normal that router should
    respond to such ping request, how can I block it without using
    specific ACLs?

    Thanks in advnace.
     
    VNTHOMAS, Nov 12, 2003
    #1
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