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Understanding Martian Addresses

 

Martian addresses are host or network addresses about which all routing information is ignored. When received by the routing device, these routes are ignored. They commonly are sent by improperly configured systems on the network and have destination addresses that are obviously invalid.

In IPv6, the loopback address and the multicast resolve and discard routes are the default martian addresses.

In Junos OS Release 10.4R5 and later, the reserved IPv6 multicast address space (ff00::/8 and ff02::/16) is added to the list of martian addresses.

In Junos OS Release 9.6 and later, you can configure Class E addresses on interfaces. Class E addresses are treated like any other unicast address for the purpose of forwarding. To allow Class E addresses to be configured on interfaces, you must remove the Class E prefix from the list of martian addresses. To remove the Class E prefix from the list of martian addresses include the martians 240/4 orlonger allow statement at the [edit routing-options] hierarchy level.

To view the default and configured martian routes, run the show route martians command.

IPv4 Martian Addresses

user@host> show route martians table inet.

IPv6 Martian Addresses

user@host> show route martians table inet6