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Troubleshooting wireless connectivity: Step 6

25 Sep 2006 | SearchNetworking.com

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If you cannot ping another LAN host, then the sender or receiver or both may be blocking ICMP pings. If using Windows XP SP1 or earlier, open the adapter's Properties panel, choose the Advanced tab, and make sure that the Internet Connection Firewall box is unchecked. If using Windows XP SP2, verify that the Windows Firewall is disabled. If using a personal firewall like ZoneAlarm, temporarily disable that firewall program. Now retry ping. If successful, then your firewall(s) were blocking ICMP ping and may also be blocking other protocols like Windows Network sharing. Re-enable firewalls on both hosts, configuring each firewall to permit only the traffic you really want to exchange between LAN hosts. For example, to share folders and printers on your customer's LAN, permit incoming NetBIOS connections from the same local subnet.

Troubleshooting wireless connectivity

Step 1: Recheck physical connections
Step 2: Verify wireless adapter connection
Step 3: Verify router's LAN port activity
Step 4: Check wireless adapter's IP address
Step 5: Verify reachability
Step 6: Check firewall connection
Step 7: Verify that the adapter is associating with the wireless router
Step 8: Find and fix a wireless security parameter mismatch
Step 9: Debug 802.1X
Step 10: Fix an 802.1X EAP mismatch or credential problem
Step 11: RF interference and roaming

About the author
Lisa Phifer is vice president of Core Competence Inc., a consulting firm specializing in network security and management technology. Lisa has been involved in the design, implementation and evaluation of data communications, internetworking, security and network management products for nearly 20 years. She teaches about wireless LANs and virtual private networking at industry conferences and has written extensively about network infrastructure and security technologies for numerous publications. She is also a site expert to SearchMobileComputing.com and SearchNetworking.com.

This tip originally appeared on SearchNetworking.com.

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