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- ************************************************************************
- DDN MGT Bulletin 96 DISA DDN Defense Communications System
- 16 April 1992 Published by: DDN Network Info Center
- (NIC@NIC.DDN.MIL) (800) 365-3642
-
-
- DEFENSE DATA NETWORK
- MANAGEMENT BULLETIN
-
- The DDN MANAGEMENT BULLETIN is distributed online by the DDN Network
- Information Center under DISA contract as a means of communicating
- official policy, procedures and other information of concern to
- management personnel at DDN facilities. Back issues may be read
- through the TACNEWS server ("@n" command at the TAC) or may be
- obtained by FTP (or Kermit) from the NIC.DDN.MIL host [192.112.36.5]
- using login="anonymous" and password="guest". The pathname
- for bulletins is ddn-news/ddn-mgt-bulletin-nn.txt (where "nn" is the
- bulletin number).
- ************************************************************************
-
- DDN Mailbridge Status
-
- This bulletin addresses a change in the status of the Defense Data
- Network (DDN) Mailbridges (MB). Request widest dissemination.
-
- 1. As of April 20, 1992, the Mailbridges will no longer
- provide store-and-forward services to the non-MILNET Internet
- (commonly known as NSFNET), and they will no longer provide
- reachability information about NSFNET via External Gateway Protocol
- (EGP). Mailbridges will continue, though, to provide MILNET
- reachability information. The following sections address these
- changes in Mailbridge functionality in detail:
-
- -- FIX-West Cisco
- -- Connectivity to NSFNET
- -- Default Gateways for Internet Traffic
- -- Mailbridge Reconfiguration
- -- EGP Server Assignments
-
- 2. A Cisco has been installed on Node 16 as the replacement for the
- store-and-forward functionality of the BMILAMES Mailbridge on the west
- coast. This Cisco will become operational after April 13, 1992 as
- 26.19.0.16. The status of the FIX-West Cisco is similar to the Ft.
- Detrick Cisco--it will only provide store-and-forward functionality
- (not EGP route server functionality).
-
- 3. As of April 20, 1992, the Mailbridge at FIX-West (BMILAMES) will
- no longer provide store-and-forward service for packets destined for
- NSFNET. None of the Mailbridges will have reachability information
- about NSFNET (though they will continue to have MILNET reachability
- information). Any packet sent to any Mailbridge destined for
- NSFNET will receive an ICMP 'Network Unreachable' message.
-
- All references to BMILAMES (26.20.0.16) as a default gateway for
- Internet traffic should be changed to the FIX-West Cisco (26.19.0.16).
- Between April 13 and April 20, both the FIX-West Cisco and BMILAMES
- will provide store-and-forward functionality to MILNET hosts. After
- April 20, BMILAMES will provide EGP route server functionality only.
- The FIX-West Cisco (26.19.0.16), together with the Cisco at Ft.
- Detrick (26.29.0.54), will connect the MILNET and NSFNET.
-
- Note that MILNET hosts and gateways that must send traffic to a
- statically configured default gateway should use the FIX-West Cisco at
- (26.19.0.16) or the Ft. Detrick Cisco (26.29.0.54) for their static
- routes.
-
- 4. Due to memory limitations, the routing tables in the Mailbridges are
- unable to store routing information for more than 3750 networks .
- The Mailbridges, therefore, will eliminate NSFNET information from their
- routing tables and EGP updates. Instead, they will be configured to
- distribute a default gateway via either a default network of 0.0.0.0,
- or a default network of 129.140.0.0, the NSFNET backbone network.
-
- A configuration change for the mailbridges will be made to reflect the
- changes at FIX-West. This patch (patch 17), to be deployed on April
- 21, 1992, will configure the Mailbridges as specified here:
-
- MB Mode Network Primary Secondary
- Advertised Default Default
-
- BMILAMES "Net NSF" 129.140.0.0 FIX-West-Cisco Detrick
- BMILISI "Net 0" 0.0.0.0 FIX-West-Cisco Detrick
- BMILOAK "Net NSF" 129.140.0.0 FIX-West-Cisco Detrick
- BMILRAN "Net NSF" 129.140.0.0 FIX-West-Cisco Detrick
- BMILANDR "Net NSF" 129.140.0.0 Detrick FIX-West-Cisco
- BMILDCEC "Net NSF" 129.140.0.0 Detrick FIX-West-Cisco
- BMILRICH "Net 0" 0.0.0.0 Detrick FIX-West-Cisco
-
-
- "Net NSF" implies that the Mailbridge will advertise one default network
- for all NSFNET routes--129.140.0.0.
-
- "Net 0" implies that the Mailbridge will advertise net 0.0.0.0 as
- the default network for all NSFNET routes.
-
- For example, gateways receiving information from EGP sessions with
- BMILAMES will be told to default NSFNET traffic via network
- 129.140.0.0 with a next hop being the FIX-West Cisco. If the FIX-West
- Cisco is down, it will advertise the Detrick Cisco as the next hop to
- network 129.140.0.0.
-
- For Cisco routers that are unable to use a default network of 0.0.0.0,
- it is recommended that they configure an 'ip default-network 129.140.0.0'.
-
- To reiterate, ALL Mailbridges will distribute limited (MILNET only)
- updates. In addition, BMILAMES, BMILOAK, BMILRAN, BMILANDR, and
- BMILDCEC will advertise network 129.140.0.0, and BMILISI and BMILRICH
- will advertise network 0.0.0.0.
-
- 5. EGP Server Assignment
- As stated in DDN Management Bulletin 83, Section 6, connectivity (in
- the near future) between MILNET and NSFNET will be provided via IP
- routers on the T1-backbone. A new assignment for EGP servers and
- Internet traffic accompanying these changes will be announced prior
- to the deployment of this connectivity plan.
-
- In the meantime, the use of Mailbridges as EGP servers should
- adhere to the following guidelines:
-
- a) Gateways, such as Ciscos, that can utilize a specified default
- network of 129.140.0.0 should use BMILAMES, BMILRAN, BMILANDR.
-
- b) Gateways, such as Unix machines running "gated", that can utilize a
- default network of 0.0.0.0 should use BMILISI and BMILRICH.
-
- c) Air Force concentrators should continue to use BMILDCEC and
- BMILOAK. Note BMILDCEC and BMILOAK will advertise 129.140.0.0
- instead of 0.0.0.0 as the default network.
-
- d) Questions or issues should be directed to the DDN Monitoring Center
- Trouble Desks:
-
- (1) CONUS: 1-800-451-7413 or (703) 486-1982 or (DSN) 231-1787.
- (2) Europe: (ETS) 430-5532 or (MIL) 2729-5532 or
- (DSN) 314-430-5532 or (CIV) 011-49-680-5532
- (3) Pacific: (808) 656-1472 or (DSN) 315-456-1472
-
- e) The following network addresses apply:
-
- Mailbridge Site Location Network Address
-
- BMILAMES Moffett Field, CA 26.20.0.16
- BMILANDR Andrews AFB, MD 26.1.0.67
- BMILDCEC Reston, VA 26.21.0.104
- BMILISI Marina Del Rey, CA 26.6.0.103
- BMILOAK Oakland, CA 26.1.0.148
- BMILRAN Randolph AFB, TX 26.1.0.51
- BMILRICH Richmond, VA 26.3.0.246
-
- f) Specific EGP assignments should follow those given in DDN
- Management Bulletin 83. However, BMILANDR now replaces BMILMTR,
- and BMILRICH replaces BMILBBN. Please note that, as no Mailbridge
- will send EGP Updates larger than 8 Kbytes, 'Net NSF' and 'Net 0'
- now imply the default network advertised rather than the update size
- (see section 4 above).
-
- g) Prior to 1 Jun 92, BMILBBN (at MILNET node 72) will be reactivated.
- This is based on PSN 72 being given more robust communications via
- faster ISTs. Once this has happened, DISA will assess the impact of
- adding the eighth mailbridge. If this is beneficial, new assignments
- for EGP service will again be issued. More on this subject will
- follow after reactivation of BMILBBN.
-
-
-