Verifying And Troubleshooting Dhcp; Web Cache - McAfee SG310 Administration Manual

Network Setup menu options

Web cache

Figure 137 Windows Internet Protocol (TCP/IP) Properties dialog box
Select Obtain an IP address automatically, Obtain DNS server address automatically and click
4
OK, and OK again.

Verifying and troubleshooting DHCP

Once you have configured DHCP, verify that it is working correctly:
• Check the DHCP Server page to see if it has assigned any IP addresses.
• On the PC, verify that the PC has acquired an IP address using ipconfig.
• Use the tcpdump within the Management Console (see
line interface to see DHCP packets. Look for the DHCP Discover packets:
20:14:03.401025 IP 0.0.0.0.68 > 255.255.255.255.67: UDP, length 302
Note that UDP port 67 is used for the DHCP server and UDP port 68 is used for the DHCP client.
• If the UTM Firewall appliance is being used as an DHCP client, inspect the front panel LEDs. If the
appliance's LAN interface cannot get a DHCP-assigned IP address, all lights flash simultaneously. To
remedy this:
• Verify a valid Ethernet link on the LAN connection of the UTM Firewall appliance. To validate an Ethernet
link, check the LEDs on the rear of the appliance. Ensure the Ethernet link LED is lit. For more
information on the LEDs for a model, see the relevant LEDS topic in
• Verify with the administrator of the DHCP server that it is running and contactable via broadcast on the
UTM Firewall LAN interface.
• Verify with the administrator of the DHCP server that there are free addresses available for clients.
• Inspect the system log for any errors.
Web cache
Web browsers running on PCs on your LAN can use the proxy-cache server of the UTM Firewall appliance to
reduce Internet access time and bandwidth consumption.
Note: Web Cache is applicable to SG565, SG580, SG640, and SG720 models only.
132 McAfee UTM Firewall 4.0.4 Administration Guide
Capturing and displaying
Chapter 1,
packets) or the command
Introduction.