Adding Martian Addresses
Problem
You want to add a martian address to the JUNOS default martian list.
Solution
Specify the martian address in the [edit routing-options] hierarchy:
[edit routing-options] aviva@router1# set martians 1.0.0.0/0 tHRough 1.0.0.0/32
Discussion
Martian addresses are prefixes reserved for a specific purpose and not subject to future allocation by the IANA. You should never see traffic from these prefixes; if you do, it generally indicates that a system somewhere on the network is misconfigured. By default, the JUNOS software ignores all martian addresses and does not install them in the routing table. The JUNOS software maintains the following martian addresses by default:
aviva@router1> show route martians inet.0: 0.0.0.0/0 exact -- allowed 0.0.0.0/8 orlonger -- disallowed 127.0.0.0/8 orlonger -- disallowed 128.0.0.0/16 orlonger -- disallowed 191.255.0.0/16 orlonger -- disallowed 192.0.0.0/24 orlonger -- disallowed 223.255.255.0/24 orlonger -- disallowed 240.0.0.0/4 orlonger -- disallowed … inet6.0: ::1/128 exact -- disallowed
These correspond to the all-zeros and all-ones classful network numbers, as well as the Class E network space. All of the former addresses were reserved by IANA (and many still are), and routing for the latter is undefined.
There is no permanent list of martian addresses because the address spaces that IANA chooses to reserve and make available for allocation change over time. Some martian addresses are not included in the JUNOS defaults, and some of the address blocks included in the JUNOS software default martian list have since been made available for allocation by IANA (see RFC 3330).
This recipe adds an address to the martian list on a router. Look at the martian routes in the routing table to verify that the address has been added:
aviva@router1> show route martians table inet.0 inet.0: 0.0.0.0/0 exact -- allowed 0.0.0.0/8 orlonger -- disallowed 127.0.0.0/8 orlonger -- disallowed 128.0.0.0/16 orlonger -- disallowed 191.255.0.0/16 orlonger -- disallowed 192.0.0.0/24 orlonger -- disallowed 223.255.255.0/24 orlonger -- disallowed 240.0.0.0/4 orlonger -- disallowed 1.0.0.0/0 through 1.0.0.0/32-- disallowed
The disallowed keyword in the output means that the route is treated like a martian and is blocked.
As the IANA allocations change, you will want to remove some of the prefix blocks from the list to override the defaults. To change the JUNOS defaults so the only martians are 0.0.0.0/8 (addresses on this network), 127.0.0.0/8 (loopback address), and 240.0.0.0/4 (experimental address block, formerly the Class E addresses), configure the martian addresses to allow the remaining defaults:
[edit routing-options] aviva@router1# set martians 128.0.0.0/16 orlonger allow aviva@router1# set martians 191.255.0.0/16 orlonger allow aviva@router1# set martians 192.0.0.0/24 orlonger allow aviva@router1# set martians 223.255.255.0/24 orlonger allow
You can verify that these prefixes are now accepted:
aviva@router1> show route martians table inet.0 inet.0: 0.0.0.0/0 exact -- allowed 0.0.0.0/8 orlonger -- disallowed 127.0.0.0/8 orlonger -- disallowed 128.0.0.0/16 orlonger -- allowed 191.255.0.0/16 orlonger -- allowed 192.0.0.0/24 orlonger -- allowed 223.255.255.0/24 orlonger -- allowed 240.0.0.0/4 orlonger -- disallowed
The allowed keyword in the output means that the routes are now accepted.
RFC 3330, Special-Use IPv4 Addresses, describes specialized IPv4 address blocks that have been assigned to IANA to manage. Team Cymru maintains information about other prefixes that you might want to mark as martians (see http://www.cymru.com/gillsr/documents/junos-bgp-template.pdf and http://www.cymru.com/gillsr/documents/junos-martians.txt).
See Also
RFC 3330, Special-Use IPv4 Addresses and Team Cmyru (http://www.cymru.com/gillsr/documents/junos-bgp-template.pdf and http://www.cymru.com/gillsr/documents/junos-martians.txt)
Router Configuration and File Management
- Introduction
- Configuring the Router for the First Time
- Configuring the Router from the CLI
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- Displaying the Commands to Recreate a Configuration
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Basic Router Security and Access Control
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IPSec
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SNMP
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Logging
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NTP
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Router Interfaces
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IP Routing
- IP Routing
- Introduction
- Viewing the Routes in the Routing Table
- Viewing Routes to a Particular Prefix
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- Creating Static Routes
- Blackholing Routes
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- Aggregating Routes
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- Adding Martian Addresses
- Changing Route Preferences to Migrate to Another IGP
- Configuring Routing Protocols to Restart Without Losing Adjacencies
Routing Policy and Firewall Filters
- Routing Policy and Firewall Filters
- Introduction
- Creating a Simple Routing Policy
- Changing a Routes Routing Information
- Filtering Routes by IP Address
- Filtering Long Prefixes
- Filtering Unallocated Prefix Blocks
- Creating a Chain of Routing Policies
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RIP
- RIP
- Introduction
- Configuring RIP
- Having RIP Advertise Its Routes
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- Sending Version 1 Update Messages
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IS-IS
- IS-IS
- Introduction
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- Viewing the IS-IS Link-State Database
- Viewing Routes Learned by IS-IS
- Configuring IS-IS for IPv6
- Configuring a Level 1Only Router
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OSPF
- Introduction
- Configuring OSPF
- Viewing Routes Learned by OSPF
- Viewing the OSPF Link-State Database
- Configuring OSPF for IPv6
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BGP
- Introduction
- Configuring a BGP Session Between Routers in Two ASs
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- Diagnosing TCP Session Problems
- Adjusting the Next-Hop Attribute
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- Setting Up Route Reflectors
- Mitigating Route Instabilities with Route Flap Damping
- Adding a BGP Community to Routes
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- Tracing BGP Protocol Traffic
MPLS
- Introduction
- Configuring LSPs Using LDP as the Signaling Protocol
- Viewing Information and LDP-Signaled LSPs in the Routing Tables
- Verifying that an LDP-Signaled LSP Is Carrying Traffic
- Enabling LDP Authentication
- Tracing LDP Operations
- Setting Up RSVP-Signaled LSPs
- Viewing Information About RSVP-Signaled LSPs in the Routing Tables
- Verifying Packet Labels
- Verifying that the RSVP-Signaled LSP Is Carrying Traffic
- Configuring RSVP Authentication
- Protecting an LSPs Path
- Using Fast Reroute to Reduce Packet Loss Following a Link Failure
- Automatically Allocating Bandwidth
- Prioritizing LSPs
- Allowing IGP Traffic to Use an LSP
- Installing LSPs into the Unicast Routing Table
- Tracing RSVP Operations
VPNs
- Introduction
- Setting Up a Simple Layer 3 VPN
- Viewing the VPN Routing Tables
- Adding a VPN for a Second Customer
IP Multicast
- Introduction
- Configuring PIM-SM
- Manually Establishing a PIM-SM RP
- Using Auto-RP to Dynamically Map RPs
- Setting Up a PIM-SM Bootstrap Router
- Filtering PIM-SM Bootstrap Messages
- Configuring Multiple RPs in a PIM-SM Domain with Anycast RP
- Configuring Multiple RPs in a PIM-SM Domain Anycast PIM
- Limiting the Group Ranges an RP Services
- Viewing Multicast Routes
- Checking the Groups for Which a PIM-SM Router Maintains Join State
- Manually Configuring IGMP
- Using SSM
- Connecting PIM-SM Domains Using MSDP and MBGP
- Configuring PIM-DM
- Tracing PIM Packets
EAN: 2147483647
Pages: 290
