Enterasys Networks CSX7000 Bedienungsanleitung PDF herunterladen (Seite 472)

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101

USER’S GUIDE

472 CyberSWITCH

PROXY ARP

Use the following graphic to help you in verifying that Proxy ARP is operational. When following

the verification steps, substitute your addresses for the addresses used in the example.

1. Create two Ethernet LANs connected across the WAN with a CyberSWITCH and a second

Cabletron platform (for example, another CyberSWITCH product) properly configured. The

two Ethernet segments should be subnets of the same IP network. All IP host devices on the

Ethernet segments (except the CyberSWITCH and the other Cabletron platform) should be

configured with the natural subnet mask so that both Ethernet segments look like one IP

network to all the IP host devices on the segments.

2. Try to have an IP host device on one Ethernet segment communicate with an IP host device on

the other Ethernet segment. For example, ping from Host A to Host B.

3. If the communication between two IP devices across the WAN is successfully established, then

the proxy ARP feature is properly working.

4. If the communication can NOT be established, display the ARP cache on the IP host devices to

see what MAC addresses are mapped to the target IP address. On many operating systems, the

arp -a

command displays the ARP cache. If the target IP addresses are mapped into the

nearest CyberSWITCH’s MAC addresses respectively, for example, on Host A, Host B’s IP

address is mapped to the CyberSWITCH A’s MAC address, then the proxy ARP feature is

working properly, but basic IP routing may not be operational. Establish the basic IP

connectivity first, then try to use the proxy ARP feature. If the target IP addresses are not shown

(or are mapped to MAC addresses that are not displayed), try the following:

a. On both CyberSWITCH platforms, issue the

ipnetif

manage mode command to make

sure that the proxy ARP feature is enabled for the LAN interface. If it is not enabled on one

or both of the CyberSWITCH platforms, enable it through the CFGEDIT configuration

utility. Note that you have to restart the system for the changes to be effective.

b. On both platforms, issue the

ipnetif

manage mode command to make sure the LAN

interfaces are configured with the proper subnet mask. Configure these platforms with the

proper subnet masks, not the natural masks.

ISDN

CSX5500

"Site1"

CSX1200

"Site2"

Host A: 128.168.1.2

Host B: 128.168.2.2

128.168.1.x

128.168.2.x

WORKGROUP REMOTE ACCESS SWITCH

LAN

10BASE-TRXTXSERVICE

CH-2

D-CH

CH-1

SYNC

POWER

LINE

CH-2

D-CH

CH-1

SYNC

LINE

CH-2

D-CH

CH-1

SYNC

LINE

CH-2

D-CH

AGI

CH-1

SYNC

LINE

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