Configuring The Dns Trusted Interface; Setting The Dscp Value For Outgoing Dns Packets; Displaying And Maintaining Ipv4 Dns - HP FlexNetwork MSR2003 Configuration Manual

Step
1. Enter system view.
2. Specify the source
interface for DNS
packets.

Configuring the DNS trusted interface

This task enables the device to use only the DNS suffix and domain name server information
obtained through the trusted interface. The device can then obtain the correct resolved IP address.
This feature protects the device against attackers that act as the DHCP server to assign incorrect
DNS suffix and domain name server address.
To configure the DNS trusted interface:
Step
1. Enter system view.
2. Specify the DNS trusted
interface.

Setting the DSCP value for outgoing DNS packets

The DSCP value of a packet specifies the priority level of the packet and affects the transmission
priority of the packet. A bigger DSCP value represents a higher priority.
To set the DSCP value for outgoing DNS packets:
Step
1. Enter system view.
2. Set the DSCP value for
outgoing DNS packets.

Displaying and maintaining IPv4 DNS

Execute display commands in any view and reset commands in user view.
Task
Display the domain name resolution
table.
Command
system-view
dns source-interface
interface-type
interface-number
[ vpn-instance
vpn-instance-name ]
Command
system-view
dns trust-interface interface-type
interface-number
Command
system-view
•
DSCP value for IPv4 DNS
packets:
dns dscp dscp-value
•
DSCP value for IPv6 DNS
packets:
ipv6 dns dscp dscp-value
Command
display dns host [ ip | ipv6 ] [ vpn-instance vpn-instance-name ]
103
Remarks
N/A
By default, no source interface for DNS packets
is specified.
If you execute the command multiple times, the
most recent configuration takes effect.
If you specify the vpn-instance
vpn-instance-name option, make sure the
source interface is on the specified VPN.
Remarks
N/A
By default, no DNS trusted
interface is specified.
You can configure up to 128 DNS
trusted interfaces.
Remarks
N/A
By default, the DSCP value for
outgoing DNS packets is 0.
The configuration is available on
DNS clients and DNS proxy
devices.