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DDN MGT Bulletin 75               DCA DDN Defense Communications System   
1 Aug 90                          Published by: DDN Network Info Center
                                      (NIC@NIC.DDN.MIL)  (800) 235-3155


                        DEFENSE  DATA  NETWORK

                         MANAGEMENT  BULLETIN

The DDN MANAGEMENT BULLETIN is distributed online by the DDN Network
Information Center under DCA 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 [192.67.67.20]
using login="anonymous" and password="guest".  The pathname
for bulletins is DDN-NEWS:DDN-MGT-BULLETIN-nn.TXT (where "nn" is the
bulletin number).
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          DEFENSE DATA NETWORK MAILBRIDGES/CORE GATEWAYS


DDN Management Bulletin 74 defined MILNET gateway and host addressing
assignments for acquiring Exterior Gateway Protocol (EGP) service and
access to subscribers on the Internet.  Please correct the Internet
address given in that bulletin for the Randolph AFB, TX mailbridge to
read 26.3.0.101.  DDN Management Bulletin 74 incorrectly had this
address as 26.30.0.101 (the correct host port is three, NOT thirty).

In addition, it is emphasized that the 800 number provided in
Bulletin 74 should only be used for questions concerning address
assignments.   All other problems (e.g., line outages and cross-network
connection difficulties) should be first referred to the MILNET
Trouble Desk serving the geographic area of the subscriber as follows:

    A.  CONUS/Western hemisphere, except Washingon, DC and Alaska: 
        1-800-451-7413 or (202) 486-1982 or (DSN) 231-1787

    B.  Europe:  (DSN) 314-430-5532/5534 or (ETS) 430-5532/5534 or 
        (MIL) 2729-5532/5534 or (International) 011-49-711-687-7766 
        and 011-49-680-5532/5534

    C.  Pacific:  (DSN) 315-456-1472/1473/1474 or (Commercial)
        808-656-1472/1473/1474 and 808-624-3744


2.  The following is an update on actions being taken to alleviate
problems being encountered with the mailbridges:

    A.  The seventh mailbridge at Randolph is scheduled for activation on 
6 Aug 90.

    B.  Cutover to the new assignments listed in DDN Management
Bulletin 74 is scheduled for 10-12 Aug 90.

    C.  Selected Air Force concentrators have been modified to access only 
a primary EGP server; this has resulted in a reduced demand for EGP 
service.  Other gateway administrators are encouraged to take the same 
action if at all possible.

    D.  Software changes have been deployed and successfully tested with 
Air Force concentrator gateways that permit negotiated EGP update polling 
for up to sixty minute intervals (versus the defacto default of three 
minute intervals).  Other gateway administrators are encouraged to use this 
new feature as well.

    E.  A positive exchange was held with Army, Navy, Air Force, and 
industry representatives on 20 Jun 90.  This resulted in a common 
understanding of the complexities associated with gateway protocols and 
Internet routing issues and laid the groundwork for implementation of 
protocols beneficial to all.

    F.  An extended outage of the communications link between the
mailbridge in McLean, VA and the Internet node at College Park, MD has
had an adverse impact on traffic between the MILNET and the Internet,
as well as on network gateway updates from the Internet.  This outage
forces all traffic and updates to traverse the mailbridge at Moffett
Field, CA and results in the inability to handle the offered traffic
load and occasional loss of EGP updates.  The restoration of this
vital link is being actively pursued and we are evaluating the
feasibility of establishing other alternate paths between the MILNET
and the Internet.  We are also working with the Army to off-load a
major MILNET/Internet host traffic flow directly to the Internet.


3.  Request widest dissemination of the above information.  POC is Mr. Wayne 
Grindle, DOD, (DSN) 356-5030 or (703) 285-5030 or Mr. Dennis Morris, DRFD, 
(DSN) 356-5221 or (703) 285-5221.