Except for existing within a secure environment, the SIPRNet
is virtually indistinguishable from the Internet to the user.
Its chief visible difference is the domain name system, with
almost all sites being under '.smil.mil' or '.sgov.gov'
. Among its many features, computers cleared for SIPRNet access
connect to the network via secure dial-up or LAN connections,
access web pages written in standard HTML using a standard
web browser, can upload and download files via FTP connections,
and can send or receive email messages through SMTP services
using email programs such as Microsoft Outlook. All data transmitted
on SIPRNet between secure facilities must be encrypted by
approved NSA encryption systems. While the public Internet
can be used to transmit encrypted SIPRNet packets ("SIPR over
NIPR"), no access is permitted between the two networks.
SIPRNet and NIPRnet are referred to colloquially as SIPR
(pronounced 'sipper') and NIPR (pronounced 'nipper'), respectively.
SIPRNet hosts a forum called CAVNET which is used in Iraq
to share Tactics, Techniques, and Procedures data.
NIPRNet (Non-classified Internet Protocol Router Network) (formerly called the Non-secure Internet Protocol Router Network). NIPRNET is used to exchange unclassified but sensitive information between "internal" users as well as providing users access to the Internet. NIPRNet is comprised of Internet protocol routers owned by the United States Department of Defense (DOD). It was created by the Defense Information Systems Agency (DISA) to supersede the earlier MILNET.
NIPRNet is, by design, a parallel airgapped analogue to the SIPRNET, providing seamless interoperability for unclassified combat support applications, as well as providing a gateway to the public Internet. While the two networks are not intended to logically intersect, occasionally it is seen as necessary to tunnel the encrypted SIPRNET over NIPRNet ("SIPR over NIPR").
SIPRNet and NIPRnet are referred to colloquially as sipper-net and nipper-net, respectively.
Data rates range
from 56 kb/s to 622 Mb/s, along with remote dial-up services,
also at 56 kbit/s.
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