Configuring Dynamic Domain Name Resolution; Setting The Dscp Value For Dns Packets - HP 6125G Configuration Manual

Configuring dynamic domain name resolution

To send DNS queries to a correct server for resolution, dynamic domain name resolution needs to be
enabled and a DNS server needs to be configured.
In addition, you can configure a DNS suffix that the system will automatically add to the provided
domain name for resolution.
Configuration restrictions and guidelines
You can configure up to six DNS servers, in system view, and up to six DNS servers on all interfaces
•
of a device.
A DNS server configured in system view has a higher priority than one configured in interface view.
•
A DNS server configured earlier has a higher priority than one configured later in the same view.
A DNS server manually configured has a higher priority than one dynamically obtained through
DHCP. A name query request 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.
You can specify up to ten DNS suffixes.
•
Configuration procedure
To configure dynamic domain name resolution:
Step
1. Enter system view.
2. Enable dynamic domain
name resolution.
3. Specify a DNS server.
4. Configure a DNS suffix.

Setting the DSCP value for DNS packets

An IPv4 packet header contains an 8-bit Type of Service (ToS) field. As defined in RFC 2474, the first six
bits set the Differentiated Services Code Point (DSCP) value, and the last two bits are reserved. Network
devices use the DSCP value as a reference to determine the packet priority for transmission.
To set the DSCP value for DNS packets:
Step
1. Enter system view.
Command
system-view
dns resolve
•
(Approach 1) In System view:
dns server ip-address
•
(Approach 2) In interface
view:
a. interface interface-type
interface-number
b. dns server ip-address
c. quit
dns domain domain-name
Command
system-view
63
Remarks
N/A
Disabled by default.
Use at least one approach.
Not specified by default.
Optional.
Not configured by default. Only the
provided domain name is resolved.
Remarks
N/A