HP 6125XLG R2306-HP 6125XLG Blade Switch Layer 3 - IP Services Configuration G - Page 91
Configuring dynamic domain name resolution, Configuration guidelines, Configuration procedure
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Configuring dynamic domain name resolution To send DNS queries to a correct server for resolution, you must enable dynamic domain name resolution and configure DNS servers. A DNS server manually configured takes precedence over the one dynamically obtained through DHCP, and a DNS server configured earlier takes precedence. A name query is first sent to the DNS server that has the highest priority. If no reply is received, it is sent to the DNS server that has the second highest priority, and thus in turn. In addition, you can configure a DNS suffix that the system automatically adds to the provided domain name for resolution. A DNS suffix manually configured takes precedence over the one dynamically obtained through DHCP, and a DNS suffix configured earlier takes precedence. The DNS resolver first uses the suffix that has the highest priority. If the name resolution fails, the DNS resolver uses the suffix that has the second highest priority, and thus in turn. Configuration guidelines Follow these guidelines when you configure dynamic domain name resolution: • You can specify DNS server IPv4 addresses for the public network and up to 1024 VPNs, and specify a maximum of six DNS server IPv4 addresses for the public network or each VPN. • You can specify DNS server IPv6 addresses for the public network and up to 1024 VPNs, and specify a maximum of six DNS server IPv6 addresses for the public network or each VPN. • An IPv6 name query is first sent to the IPv6 DNS servers. If no reply is received, it is sent to the IPv4 DNS servers. • You can specify domain name suffixes for the public network and up to 1024 VPNs, and specify a maximum of 16 domain name suffixes for the public network or each VPN. Configuration procedure To configure dynamic domain name resolution: Step 1. Enter system view. 2. Specify a DNS server IP address. Command system-view • Specify a DNS server IPv4 address: dns server ip-address [ vpn-instance vpn-instance-name ] • Specify a DNS server IPv6 address: ipv6 dns server ipv6-address [ interface-type interface-number ] [ vpn-instance vpn-instance-name ] 3. (Optional.) Configure a dns domain domain-name [ vpn-instance DNS suffix. vpn-instance-name ] Remarks N/A Use at least one command. By default, no DNS server IP address is specified. By default, no DNS suffix is configured. Only the provided domain name is resolved. Configuring the DNS proxy You can specify multiple DNS servers. The DNS proxy forwards a request to the DNS server that has the highest priority. If having not received a reply, it forwards the request to a DNS server that has the second highest priority, and thus in turn. 82