Which RFC outlines BCP 84?
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BCP 84 refers to "Ingress Filtering for Multihomed Networks". This Best Current Practice (BCP) provides recommendations for the deployment of Ingress Filtering on the borders of a network with multiple connections to other networks (multihomed).
The purpose of Ingress Filtering is to prevent the source address spoofing attacks where an attacker can forge the source IP address of a packet to bypass security measures and launch attacks from within the network. Ingress Filtering works by verifying that incoming packets are from a legitimate source IP address range.
RFC 3704 outlines BCP 84, and it provides guidelines for network operators to implement Ingress Filtering on their networks with multiple connections to other networks. The document describes the rationale for Ingress Filtering and provides recommendations on how to deploy it effectively.
RFC 2827, also known as "Network Ingress Filtering: Defeating Denial of Service Attacks which employ IP Source Address Spoofing", is related to BCP 84 as it provides a technical basis for Ingress Filtering to prevent DoS attacks using IP source address spoofing.
RFC 3030 is titled "SMTP Service Extension for Transmission of Large and Binary MIME Messages", and it is not related to BCP 84.
RFC 2267 is titled "Network Ingress Filtering: Egress Filtering", and it provides guidelines for implementing Egress Filtering to prevent spoofed packets from leaving a network.
RFC 1918 is titled "Address Allocation for Private Internets", and it defines private IP address ranges for use within local area networks (LANs). It is not related to BCP 84.