Business HSI Basic Installation
NETGEAR 7550
Technical Reference Guide v2.0
Multiple LAN Support
LAN Support
New
Feature
The 7550/7500 supports two simultaneous LAN networks: Private and Public
NOTE: The Private LAN address for the 7550 is 192.168.254.254, the Private
LAN address for the 7500 is 192.168.1.1.
The SE567 only supports a private LAN*: customer devices assigned private addresses (like 192.168.254.1).
The SX762 only supports a public LAN*: customer devices assigned public addresses (LAN Block from work order).
*When provisioned to product specifications
SE567
Modem
(resi or dynamic business)
Number of LAN networks supported
1
Type of LAN network supported
Private
SX762
(static business)
7550/7500
(resi or business)
1
2
Public
Private + Public
What does this mean?
When deploying a 7550 to a Static Business Class customer, there are no restrictions on wireless use. (Wireless devices can use the Private LAN)
Any customer devices
manually provisioned
with the assigned LAN Block IP addresses will use the Public LAN. These devices on the Public LAN will have unrestricted Internet access, both incoming and outgoing.
Any customer devices
requesting an IP address
will be assigned addresses from the Private LAN (via the DHCP server). These devices on the Private
LAN will have unrestricted Internet access in only the outbound direction (to the Internet). Internet devices trying to initiate a connection to a Private LAN device will be blocked by network address translation (NAT).
– just like residential
NAT
On by default
Private LAN
192.168.254.254
WAN
74.42.86.10
Assigned via PPP
See page 12 for setup
DHCP Server
Public LAN
173.84.136.169
Assigned by you
See page 21 for setup
3
Business HSI Basic Installation
NETGEAR 7550
Technical Reference Guide v2.0
Multiple LAN Support,
Continued
Working with two LANs
At the conclusion of a Business Class install both Private and Public LANs will be enabled and configured.
Note: The WAN and Public LAN addresses were simply chosen for example.
They will be different for every install.
On by default
Path to Internet
NAT
Private LAN
192.168.254.254
DHCP Server WAN
74.42.86.10
Assigned via PPP
See page 12 for setup
Public LAN
173.84.136.169
Assigned by you
See page 21 for setup
Any device connected via
wireless or wired
that requests an IP address will be automatically assigned an IP address from the Private LAN (via the DHCP server).
Private LAN
192.168.254.254
Auto assigned 192.168.254.14
DHCP Server
Public LAN
173.84.136.169
Auto assigned 192.168.254.15
To access modem: Use the 7550’s Private LAN address - 192.168.254.254
How many devices can the Private LAN support?
Answer: 33 devices (with default settings)
Continued on next page
4
Business HSI Basic Installation
NETGEAR 7550
Technical Reference Guide v2.0
Multiple LAN Support,
Continued
Working with two LANs
(continued)
Any device connected via
wireless or wired
that has been manually assigned an IP address from the Public LAN will be assigned to the Public LAN.
Private LAN
192.168.254.254
DHCP Server
Manually assigned 173.84.136.170
(IP is LAN Block + 2)
Path to Internet
Public LAN
173.84.136.169
Manually assigned 173.84.136.171
(IP is LAN Block +3)
To access modem: Use the 7550’s Public LAN address – 173.84.136.169
How many devices can the Public LAN support?
Answer: depends on the LAN Block subnet mask: /30=1, /29=5, /28=13
5
Typical two
LAN scenario
Customer
Value
Business HSI Basic Installation
NETGEAR 7550
Technical Reference Guide v2.0
A typical scenario using both Private and Public LANs together is shown here: A customer with 1 usable public LAN address (/30) can still benefit from wireless by using the 33 available private addresses for wireless connections.
Wireless users connect, and are assigned private IP addresses. They access the Internet through the Private LAN –
just like residential HSI
.
Wired devices have been pre-provisioned with addresses from the Public
LAN block. They access the Internet through the Public LAN.
Devices on different LANs do not have access to each other.
Private LAN
192.168.254.254
DHCP Server
Auto assigned
192.168.254.2544
Public LAN
173.84.136.169
Manually assigned 173.84.136.170
(IP is LAN Block +2)
6