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Page 119

Chapter 9: Common Configuration Examples

Wireless Client Wireless Access Point DHCP Client DHCP Server

Association Using SSID “guest” Address and TCP/IP Assignments

Association Request

Association Response

DHCP Request

DHCP ACK

DHCP Discover

DHCP Offer

SSID “guest”

The client forms an association with the

SmartPath AP but the visitor has not yet

registered. The SmartPath AP directs all

DHCP, DNS, and HTTP traffic from

unregistered guests to itself instead of

allowing it to the rest of the network.

IP Address: 172.16.1.2

Netmask: 255.255.255.0

Default Gateway: 172.16.1.1*

DHCP Server: 172.16.1.1*

DNS: 172.16.1.1*

Lease: 10 Seconds

* By default, a SmartPath AP assigns IP addresses to

subinterfaces for captive web portal use as follows:

wifi0.1 – wifi0.7 172.16.1.1 – 172.16.7.1

wifi1.1 – wifi1.7 172.16.11.1 – 172.16.17.1

3 4

DNS Querient DNS Server HTTP Client HTTP Server

DNS Address Resolution HTTP Connection to the Captive Web Portal

DNS Query

DNS Reply

HTTP GET

When the HTTP client sends a GET

command, the HTTP server replies with a

guest access registration page. The user

must agree to an acceptable use policy, fill

in some fields, and then submit the form.

Wildcard A record in the root zone “.” on the

SmartPath AP DNS server: * in a

172.16.1.1

The DNS server resolves all domain

name-to-address queries to the same IP

address, which in this case is 172.16.1.1.

Figures9-11and9-12.CaptiveWebportalexchangesusinginternalservers,Steps1–4.

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