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56 ZT8101 User’s Guide
Using the Telnet Console
2. Configure these fields.
3. Highlight APPLY and press Enter.
4. If you enabled BOOTP/DHCP Relay, highlight BOOTP/DHCP Relay Interface
Configuration and press Enter.
5. Toggle the Action field to Add and configure these fields.
6. Highlight APPLY and press Enter to make the change current.
7. To modify an entry in the table, toggle the Action field to Modify, enter the changes, highlight
APPLY, and press Enter.
8. Use Save Changes on the Main Menu to enter the table into NV-RAM.
DNS Relay
DNS relay enables the switch to act as a DNS cache or proxy and to forward DNS requests to the
DNS server only when required. Whether you enable DNS relay depends upon whether you want
to
• Save a DNS server or a linking WAN extraneous or repetitive traffic.
• Try to shorten the response time for a DNS request on a slow or long WAN.
• Change or control the IP response for a series of DNS requests.
• Control which servers are used for DNS.
When the switch receives packets destined for a DNS server and the requests are not statically
defined in the switch or previously cached, the switch forwards them to the servers as defined in
the following configuration. The switch also forwards packets from the DNS servers back to the
appropriate subnets.
To configure DNS Relay services
1. From the Main Menu, select Switch Utilities | DNS Relay and press Enter.
Field Description
BOOTP/DHCP Relay Status Enables or disables the BOOTP/DHCP relay function.
BOOTP HOPS Count Limit
Sets the maximum number of hops (routers) that the BOOTP
messages can be relayed through. If a packet’s hop count is
more than the hop count limit, the packet is dropped. The
range is between 1—16 hops. The default value is 4.
BOOTP/DHCP Relay Time Threshold
Sets the minimum time (in seconds) that the switch will wait
before forwarding a request packet. If the value in the
seconds field of the packet is less than the relay time
threshold, the packet will be dropped. The range is between
1—9999 seconds. The default value is 0 seconds.
Field Description
Interface Name
Specifies the subnet name (IP interface name) of the network that the
BOOTP or DHCP server is located on.
BOOTP/DHCP Server
Specifies the IP address of the BOOTP or DHCP relay server. Multiple
servers may be entered for a given subnet name (IP interface name).