Chapter 9 Interfaces
ZyWALL ATP Series User’s Guide
228
9.3.2 Proxy ARP
An Address Resolution Protocol (ARP) is a protocol for mapping an IP address to a MAC address. An ARP
broadcast is sent to all devices in the same Ethernet network to request the MAC address of a target IP
address.
In the following figure, a host in a WAN subnet (A) broadcasts an ARP request to all devices within its
network in order to find the MAC address of a target IP address (172.16.x.x). However, the target IP
address may be in another subnet (B) that has the same network IP address (172.16.x.x). A router, such
as the Zyxel Device, does not forward broadcasts, so the request will not reach its destination.
Enable
Proxy ARP
(RFC 1027) to allow the Zyxel Device to answer external interface ARP requests on
behalf of a device on its internal interface. Interfaces supported are:
• Ethernet
• VLAN
• Bridge
The Zyxel Device sends its external MAC address to the WAN sender as the destination for the target IP
address. From then on the sender will send packets containing that target IP address directly to the
external interface of the Zyxel Device. The Zyxel Device then forwards the packet to the correct target IP
address in its LAN.
Add
Click
Add
to create an
IPv4 Address
, an
IPv4 CIDR
(for example, 192.168.1.1/24) or an
IPv4
Range
(for example, 192.168.1.2-192.168.1.100) as the target IP address. The Zyxel Device
answers external ARP requests only if they match one of these inputted target IP addresses.
For example, if the
IPv4 Address
is 192.168.1.5, then the Zyxel Device will answer ARP
requests coming from the WAN only if it contains 192.168.1.5 as the target IP address.
Select an existing entry and click
Remove
to delete that entry.
Related Setting
Configure
PPPoE/PPTP
Click
PPPoE/PPTP
if this interface’s Internet connection uses PPPoE or PPTP or L2TP.
Configure VLAN
Click
VLAN
if you want to configure a VLAN interface for this Ethernet interface.
Configure WAN
TRUNK
Click
WAN TRUNK
to go to a screen where you can set this interface to be part of a WAN
trunk for load balancing.
Configure Policy
Route
Click
Policy Route
to go to the policy route summary screen where you can manually
associate traffic with this interface.
You must manually configure a policy route to add routing and SNAT settings for an
interface with the
Interface Type
set to
general
. You can also configure a policy route to
override the default routing and SNAT behavior for an interface with an
Interface Type
of
internal
or
external
.
OK
Click
OK
to save your changes back to the Zyxel Device.
Cancel
Click
Cancel
to exit this screen without saving.
Table 91 Configuration > Network > Interface > Ethernet > Edit (continued)
LABEL
DESCRIPTION
Содержание ATP200
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Страница 216: ...Chapter 9 Interfaces ZyWALL ATP Series User s Guide 216 Configuration Network Interface Ethernet Edit External Type ...
Страница 218: ...Chapter 9 Interfaces ZyWALL ATP Series User s Guide 218 Figure 170 Configuration Network Interface Ethernet Edit OPT ...
Страница 236: ...Chapter 9 Interfaces ZyWALL ATP Series User s Guide 236 Figure 179 Configuration Network Interface PPP Add ...
Страница 244: ...Chapter 9 Interfaces ZyWALL ATP Series User s Guide 244 Figure 181 Configuration Network Interface Cellular Add Edit ...
Страница 259: ...Chapter 9 Interfaces ZyWALL ATP Series User s Guide 259 Figure 191 Configuration Network Interface VLAN Add Edit ...
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Страница 273: ...Chapter 9 Interfaces ZyWALL ATP Series User s Guide 273 Figure 193 Configuration Network Interface Bridge Add Edit ...
Страница 361: ...Chapter 15 UPnP ZyWALL ATP Series User s Guide 361 Figure 250 Network Connections My Network Places Properties Example ...
Страница 387: ...Chapter 20 IPSec VPN ZyWALL ATP Series User s Guide 387 Figure 271 Configuration VPN IPSec VPN VPN Connection Add Edit ...
Страница 395: ...Chapter 20 IPSec VPN ZyWALL ATP Series User s Guide 395 Figure 273 Configuration VPN IPSec VPN VPN Gateway Add Edit ...
Страница 478: ...Chapter 25 Security Policy ZyWALL ATP Series User s Guide 478 Figure 328 Configuration Security Policy Policy Control ...
Страница 712: ...Chapter 37 System ZyWALL ATP Series User s Guide 712 Figure 470 Configuration System WWW Login Page Desktop View ...