Black Box LWN600CM-1 Guide de l'utilisateur télécharger pdf (Page 117)

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Chapter 9: Common Configuration Examples

Wireless Client Wireless Access Point DHCP Client DHCP Server

Forming an association Address and TCP/IP assignments

Association Request

Association Response

DHCP Request

DHCP ACK

DHCP Discover

DHCP Offer

The client forms an association with the

SmartPath AP but the visitor has not yet

registered. The SmartPath AP allows DHCP,

DNS, and ICMP* services through. It redirects

all HTTP and HTTPS traffic to its own web

server and drops all other traffic.

* If the SmartPath AP enforces a firewall policy that

blocks ICMP services from registered users, it

will also block them from unregistered users. In

contrast to ICMP, DHCP and DNS are essential

services that must always be permitted by the

SmartPath AP firewall.

The SmartPath AP allows DHCP traffic to pass

between the client of an unregistered user and

a DHCP server so that the client can receive

its IP address and TCP/IP assignments.

If the SmartPath AP enforces a firewall policy

that blocks ICMP services from registered users,

it will also block them from unregistered users. In

contrasttoICMP,DHCPandDNSareessential

services that must always be permitted by the

SmartPath AP firewall.

Figure9-8.CaptiveWebportalexchangesusingexternalDHCPandDNSservers.

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Black Box LWN600CM-1 Guide de l'utilisateur Page 117