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source-checking

Syntax

Hierarchy Level

Description

(MX Series 5G Universal Routing Platforms Only) Discard IPv6 packets when the source address type is unspecified, loopback, multicast, or link-local unicast.

RFC 4291, IP Version 6 Addressing Architecture, refers to four address types that require special treatment when they are used as source addresses. The four address types are:

  • Unspecified--The IPv6 unspecified address is 0:0:0:0:0:0:0:0, which can be notated as ::/128.

  • Loopack--The IPv6 loopback address is 0:0:0:0:0:0:0:1, which can be notated as ::1/128.

  • Multicast--IPv6 multicast addresses use the prefix FF00::/8.

  • Link-Local--IPv6 link-local addresses have the prefix FE80::/10.

The loopback and multicast addresses must never be used as a source address in IPv6 packets. The unspecified and link-local addresses can be used as source addresses but routers must never forward packets that have these addresses as source addresses. Typically, packets that contain unspecified or link-local addresses as source addresses are delivered to the local host. If the destination is not the local host, then the packet must not be forwarded. Configuring this statement filters or discards IPv6 packets of these four address types.

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 12.3.

Related Documentation