User guide

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hop. A unit for measuring the number of routers a packet has passed
through when traveling from one network to another.
hop count. Distance, measured in the number of routers to be traversed,
from a local router to a remote network. See metric.
hub. Another name for a repeater. The hub is a critical network element that
connects everything to one centralized point. A hub is simply a box with mul-
tiple ports for network connections. Each device on the network is attached
to the hub via an Ethernet cable.
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IGMP. Internet Group Management Protocol allows a router to determine
which host groups have members on a given network segment.
IKE. Internet Key Exchange protocol provides automated key management
and is a preferred alternative to manual key management as it provides bet-
ter security. Manual key management is practical in a small, static environ-
ment of two or three sites. Exchanging the key is done through manual
means. Because IKE provides automated key exchange, it is good for larger,
more dynamic environments.
INSPECTION. The best option for Internet communications security is to
have an SMLI firewall constantly inspecting the flow of traffic: determining
direction, limiting or eliminating inbound access, and verifying down to the
packet level that the network traffic is only what the customer chooses. The
Netopia Gateway works like a network super traffic cop, inspecting and filter-
ing out undesired traffic based on your security policy and resulting configu-
ration.
interface. A connection between two devices or networks.
internet address. IP address. A 32-bit address used to route packets on a
TCP/IP network. In dotted decimal notation, each eight bits of the 32-bit
number are presented as a decimal number, with the four octets separated
by periods.