Proxy Address Resolution Protocol (ARP)
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This chapter describes the Proxy Address Resolution Protocol (ARP) feature:
- Proxy ARP allows a router to answer ARP requests where the target IP address is not the router itself but a destination that the router can reach.
- If a host does not know the default gateway, proxy ARP can learn the first hop.
- Machines in one physical network appear to be part of another logical network.
- Without proxy ARP, a router responds to an ARP request only if the target IP address is an address configured on the interface where the ARP request arrived.
This chapter contains the following topics:
Configuring Proxy ARP via CLI
The following are examples of the commands used in the proxy ARP feature.
Example 1: show ip interface
CODE EXAMPLE 19-1 show ip interface
(DTI SWITCH) #show ip interface ?
<slot/port> Enter interface in slot/port format.
brief Display summary information about IP configuration
settings for all ports.
(DTI SWITCH) #show ip interface 0/24
Routing Mode................................... Disable
Administrative Mode............................ Enable
Forward Net Directed Broadcasts................ Disable
Proxy ARP...................................... Enable
Active State................................... Inactive
Link Speed Data Rate........................... Inactive
MAC Address.................................... 00:10:18:82:06:5F
Encapsulation Type............................. Ethernet
IP MTU......................................... 1500
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Example 2: ip proxy-arp
CODE EXAMPLE 19-2 ip proxy-arp
(DTI SWITCH)(Interface 0/24)#ip proxy-arp ?
<cr> Press Enter to execute the command.
(DTI SWITCH) (Interface 0/24)#ip proxy-arp
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Configuring Proxy ARP via Web Interface
The following web pages are used in the proxy ARP feature.
FIGURE 19-1 ARP Create
FIGURE 19-2 ARP Table Configuration
FIGURE 19-3
| Sun Netra CP3240 Switch User’s Guide
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820-3252-11
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© 2007 Diversified Technology, Inc. All Rights Reserved. © 2009 Sun Microsystems, Inc. All rights reserved.