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HSIM-W84 Firmware Support

HSIM-W84 Installation Guide 2-5

HDLC

Cabletron Systems has provided the High-level Data Link Control (HDLC) protocol which is used

in conjunction with the Inverse Multiplexing (IMUX) feature to conserve a user’s WAN bandwidth

between two Cabletron Systems products, over a point-to-point connection. Cabletron Systems

products such as the HSIM-W6, HSIM-W84, CSX200, and CSX400 must be in use on both ends

of the WAN link for these functions to work. The HDLC (RAW) protocol reduces the amount of

overhead information that needs to be contained within each data packet to direct it to its

destination. This decreased packet overhead provides the IMUX functions with more bandwidth to

transfer user data.

DHCP and NAT

The Dynamic Host Conﬁguration Protocol (DHCP) and Network Address Translation (NAT)

method eliminates the expense of purchasing limited public IP addresses for each client on a local

network, and the need to re-conﬁgure a client if it is moved to a different network.

The HSIM-W84 acts as a DHCP server that allows individual clients (PCs, network equipment) to

take turns using a range of private IP addresses (often referred to as local IP addresses), and

provides optional secondary setup features for these clients on a per-port basis. The HSIM-W84

distributes these addresses dynamically, assigning a local IP address to an individual client from a

range of 253 available addresses in its table on a ﬁrst-come-ﬁrst-served basis. This local IP address

is then “leased” for a predetermined amount of time, which is conﬁgured for the particular port.

The HSIM interface provides DHCP services for one Class C subnet and secondary setup features

for individual clients support the use of a default gateway, domain name and WINs server.

On the Wide Area Network (WAN) side, the Network Address Translation (NAT) routing method

is used to enable clients assigned with local IP addresses to use the public IP address(es) of the

HSIM-W84 WAN interface(s) to access the WAN.

NOTE

A private or “local” network is referred to as a sub network that is using private or

“local” IP addresses. An “outside” network refers to a Wide Area Network (WAN)

commonly known as an Internet where registered public IP addresses are required.

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