- Alcatel Internetworking, Inc. Switch Troubleshooting Guide

Troubleshooting DNS DNS Configuration Considerations
OmniSwitch Troubleshooting Guide September 2005 page 6-3
• If you find conflicting information, then see which portion has the wrong information and focus on that
layer again (layer 2, 3, or 7).
• The response packet should contain the following fields: DLC with the source Mac address of the DNS
server, and the destination MAC address of the switch. The IP header will contain the source IP
address of the DNS server, and the destination IP address of the switch. The UDP header will contain
the source port 53 (the destination port varies). The DNS header will contain a response flag, and the
answer section will contain the name and the IP address that the name references.
DNS Configuration Considerations
CLI has a limitation when entering the domain name to 126 characters. If you enter the name from
WebView you can enter up to 255 characters, and it will show up properly from the CLI. There is a limit
of up to a maximum of 3 DNS servers.