Patton OnSite 2701A/I, Руководство пользователя

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Introduction 45
OnSite 2701A/I E1/T1 Ethernet Bridge (NTU) User Manual 6 • DHCP and DNS Configuration
Introduction
The 2701A offers a DHCP Server,
DNS relay can hold two DNS server IP addresses in memory so the DNS relay can forward DNS queries and
responses between the host user and the DNS server.
Some comments on table 4 :
•
Routed means a ‘routed WAN service’ and Bridged means a ‘bridged WAN service.’
•
DHCP Server and DHCP Relay cannot be used simultaneously.
•
NAT can be used only if a Routed WAN service is configured.
•
1
If a DHCP Server were used with a Bridged WAN service, the DHCP server would respond to IP address
requests from both interfaces, that is, the Ethernet and the WAN serial interfaces.
•
2
When NAT is used together with DHCP Relay, the WAN service must be routed.
•
3
When DHCP Relay is used with a Bridged WAN service, the DHCP server must be on the same subnet as
the clients and the OnSite.
Table 4. Features and services matrix
The feature in this column [...] with (Column 1 feature)
Configured
Feature
Cannot be
used
Must be used Usually used Can be used Rarely used
DHCP
Server DHCP Relay Routed,
NAT
Bridged
1
DHCP Relay DHCP Server Routed
NAT
2
Bridged
3
DNS Relay Routed,
DHCP Server
or
DHCP Relay Bridged
NAT Bridged Routed DHCP Server,
DHCP Relay,
DNS Relay
DHCP Cli-
ent
(WAN
side)
Routed
Static IP
(WAN side)
Routed