SLAC Computer Networking
Last Update: June 11, 1997
This page provides useful information for users of the SLAC
Computer Services | Network
Group | Computer Networking | WWW Support ]
(SLAC Computer Services) Network Group's
- SLAC Networking
by R. L. A. Cottrell, a presentation for the SLAC
Computing External Review Committee, June 1997. Also, for
an earlier summary, see
SLAC on-site/off-site data communications
facilities/services by R.L.A. (Les) Cottrell, SCS
Networking Group, May 1994, on SLAC's multi-protocol LAN, the hosts connected
to it, and its connections to the Internet and other WAN services.
SLAC's LAN Service Level Expectations.
Key principles for future network tactical decisions.
- Policy on
No Tampering with Telephone, Networking Cables or Equipment.
SLAC's Network Backbone Oct-95.
- The Firewall*
router blocks some dangerous protocols to reduce SLAC's
network security exposure.
CANDO database keeps detailed information on
network hardware and software. Also you can use forms to
find information on selected hosts from CANDO*, network
device logs* and request Name Server lookups,
Pings and Traceroutes from the SLAC Web server to
- Updating the
CANDO database can be done via Web form.
- SLAC Local Area Network Size
a summary of specific characteristics of SLAC's network and
Maps of SLAC's computing networks.
- Protocols supported across the SLAC LAN are: the TCP/IP
suite, Appletalk and DECnet. We do
NOT support IPX (Novell's Netware protocol).
- Server Usage
Classification* provides a functional (file,
compute, interactive, other specialized server) list of
the main Unix based servers at SLAC.
- SLAC's Switched Network
Summer '96* and
- SLAC LAN
Subnets*, a clickable table of SLAC subnets with
information on addresses, where they go (e.g. what
buildings they service), nodes on them, monitoring
Windows NT Domains & Windows Workgroups provides a list of all SLAC's
SLAC's WAN Connections, October 1995.
See also VM Migration.
LocalTalk/PhoneNet Phase Out by Ken
Martell provides information on the migration of
Macintosh LocalTalk/PhoneNet connections to direct
Ethernet connections. Users with a continued need to
connect to LocalTalk (e.g. visitors with a Powerbook with
no Ethernet connection) are recommended to use a Farallon
Etherwave LocalTalk to Ethernet Adapter (PN840) and
for printers PN842. For details such as price,
availability of a loan etc., on the Etherwave adapters,
contact Fred Hooker.
Support Information provides information on
the phasing out of central Quickmail support.
- SLAC dropped its BITNET connection at the end of
June 1996. You may be able to locate the last known
Internet address for an extinct BITNET node by looking at
- DECnet Phase IV
connectivity is being phased out in the HEP/Esnet
community. Thus DECnet Phase IV services are expected to
degrade over time. SLAC is following the ESnet-DECnet
recommendations on installation of DECnet/OSI and use of
DECnet/IP which may be found at the ESnet
DECnet Working Group Public Home Page. The contact
person at SLAC is Charley Granieri.
of the Micom Switch* by Ken Martell,
Mar-1994, is an announcement of the plan to migrate, by
the end of 1997, from Micom terminal connections to
personal computers connected to the Ethernet. See also
by R. Les Cottrell and Tim Streater on which the
announcement is based.
- The current version of Xremote at SLAC is insecure
and the vendor of the terminal server which we use for
the Xremote gateway does not support upgrades. The
service is receiving little use; the people resources
with skills to support the service has been dramtically
reduced recently; and other emerging services (e.g. ISDN)
are more effective. We are therefore freezing Xremote
support. There will be no additional ports or new
releases of the software. If it should stop working with
a new version of some other SLAC supported software (e.g.
a new version of X11) no effort will be expended fixing
it. To resolve the security issue we have put in place
some safeguards that prevent the use of X11 applications
running on non-SLAC hosts; see the section on
X Window Security Information in the
Computing Security at SLAC page for more information
and a work-around. Newer versions of the NCD Xterminals
(with code version 3.2.1 or later) do have SLIP and PPP
built built in and so can access SLAC via the campus SLIP
service or via Netcom
or another Internet Service Provider with SLIP/PPP
support. A corollary of this reduction in support is
that we no longer recommend NCD Xterminals for
residential use with analog modems.
- SLACnet, the VM to VMS file transfer software
developed at SLAC in the mid-1980s, still works for
VAX/VMS V6.2 and earlier versions. We have no intention
of supporting it it on Alpha/VMS and upgrading it to
VAX/VMS V7.0 will be done only if requires minimal
effort. No support for SLACnet will be provided after
March 1997, when VM logon is discontinued. You should
contact Charley Granieri if
you need more details on this.
You may find the following useful: the general Introduction to Computing
SLACwide along with three platform-specific introductions, Macintosh, UNIX, and Windows NT, plus
Computing Security at SLAC.
You may also find the discussion/newsgroups SCS-BaBar
Discussion Group and slac.networks*
You may also find the following information useful:
* This page is only accessible from SLAC.
Owners: Cottrell and Winters
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