Tip

Preventing multicast security hole

When running PIM on a Cisco router interface with an access control list with a reflexive component, an inappropriate security hole can be opened. Add an out access list entry to permit the multicast packets to pass. This will avoid the reflexive component of the list from opening an inbound IP hole between the multicast address (as source) and the multicast server(as destination). The reflexive hole could be used to initiate a DoS against the multicast server(s).

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This was first published in May 2001

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