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66 NetWAYS/ISDN – Glossary
RFC 1918 (Address Allocation for Private Internets) reserves
the following parts of the IP address space for use in private
networks:
10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)
IP masquerading
Also known as Network Address Translation, or NAT. A whole
network can communicate with the Internet using just one IP
address: A computer situated between the private LAN and
the public Internet, with just one public, “official” Internet
address, can forward all LAN computers’ communications to
computers in the Internet using its own IP number as the
source address, as if all the connections came from it.
NetWAYS/ISDN translates the IP addresses of TCP, UDP and
ICMP packets so that only one source IP address is visible in
the Internet. This means that the actual, internal LAN IP ad-
dresses never appear in the Internet, and so do not have to
beofficial addresses. This also protects the local network
against unauthorized access from the Internet: the IP Mas-
querading/Network Address Translation (NAT) gateway is sig-
nificantly more difficult to break through than a good packet
filter firewall.
IPsec (Internet Protocol Security)
A network-layer security standard for Internet communica-
tion. IPsec is well suited for VPN connections and remote
LAN access over public telecommunication networks. IPsec
uses the two security protocols Authentication Header (AH)
and Encapsulating Security Payload (ESP). AH provides
source authentication; ESP provides both authentication
and encryption. Information specific to the security protocols
is transported in a packet header appended to the IP header.
IPX (Internetworking Packet Exchange Protocol)
A network protocol developed by Novell used to exchange
data packets quickly and reliably between two computers in
a network.
netways-e.book Seite 66 Freitag, 28. November 2003 3:51 15
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