3com 8807 User Guide

Fault 1: The switch cannot ping through a certain host in the LAN.

Troubleshooting can be performed as follows:

1 Check the configuration of the switch. Use the display arp command to view the 

ARP entry table that the switch maintains.

2 Check which VLAN includes the port of the switch used to connect to the host. 

Check whether the VLAN has been configured with a VLAN interface. Then check 
whether the IP address of the VLAN interface and that of the host are on the same 
network segment.

3 If the configuration is correct, enable the ARP debugging on the switch, and check 

whether the switch can correctly send and receive ARP packets. If it can only send 
ARP packets but cannot receive them, errors may occur on the Ethernet physical 
layer.