Domain Name System (DNS) Configuration on ESW2-350G Switches

Objective

The Domain Name System (DNS) takes the responsibility of mapping the domain names to IP addresses by designated authoritative name servers for each domain. A DNS server can be configured on a ESW2-350G Switch. If a switch is not configured with a DNS server, packets would be dropped by the switch when a host tries to resolve a domain name.

This article explains how to configure DNS on ESW2-350G Switches.

Applicable Devices

• ESW2-350G • ESW2-350G-DC

Software Version

• v1.2.9.44

DNS Configuration

DNS Server Configuration

Step 1. Log in to web configuration utility and choose IP Configuration > Domain Name System > DNS servers. The DNS Servers page opens:

Step 2. Check the Enable check box in the DNS field to enable the DNS server.

Step 3. (Optional) Enter the default domain name in the Default Domain Name field which helps the switch to be operated with the domain name configured.

Note: Type shows what kind of Default Domain Name is configured on switch.

• DHCP — The default domain name is dynamically assigned by the DHCP server.

• Static — The default domain name is defined by the user.

• N/A — No default domain name.

Step 4. Click Apply.

Statically Add to DNS Server Table

Step 1. Log in to the web configuration utility and choose IP Configuration > Domain Name System > DNS servers. The DNS Servers page opens:

Step 2. Click Add. The Add DNS Server windows appears.

Note: In this article we have chosen version 4 to show the configuration procedure.

Step 3. In the IP Version field, click the radio button for the IP version that the server uses. The available options are:

• Version 6 — Allows you to enter an IPv6 address.

• Version 4 — Allows you to enter an IPv4 address.

Timesaver: If Version 4 is clicked, skip to Step 6.

Step 4. If you chose Version 6 as the IP address version in Step 3, then click the type of the IPv6 address in the IPv6 address type field. The available options are:

• Link Local — The IPv6 address uniquely identifies hosts on a single network link. A link local address has a prefix of FE80 which is not routable, and can be used for communication only on the local network. Only one link local address is supported.

• Global — The IPv6 address is a global Unicast IPV6 type that is visible and reachable from other networks.

Step 5. If you clicked Link Local as the IPv6 address type in Step 4, choose the appropriate interface from the Link Local Interface drop-down list.

Step 6. Enter the IP address of the DNS server in the DNS Server IP Address field.

Step 7. Check the Active check box in the DNS Server State field to activate the DNS server you just configured.

Step 8. Click Apply.

Host Mapping Configuration

This procedure helps in mapping a host name with an IP address.

Step 1. Log in to web configuration utility and choose IP Configuration > Domain Name System > Host Mappings. The Host Mapping page opens:

Step 2. Click Add. The Add Host Mapping window appears.

Note: In this article we have chosen version 4 to show the configuration procedure.

Step 3. In the IP Version field, click the IP version of the hsot. The available options are:

• Version 6 — Allows you to enter an IPv6 address.

• Version 4 — Allows you to enter an IPv4 address.

Timesaver: If Version 4 is clicked, skip to Step 6.

Step 4. If you chose Version 6 as the IP address version in Step 3, then click the type of the IPv6 address in the IPv6 address type field. The available options are:

• Link Local — An IPv6 address that only identifies hosts on a single network link.

• Global — an IPv6 address that is reachable from other networks.

Step 5. If you chose Link Local as the IPv6 address type in Step 4, choose the appropriate interface from the Link Local Interface drop-down list.

Step 6. Enter the name that identifies the mapped host in the Host Name field.

Step 7. Enter the IP address of the mapped host in the IP Address field.

Note: If you chose IPv6 as the IP address version, then you can add up to 4 IPv6 addresses.

Step 8. Click Apply.

Step 9. (Optional) If any of the entries in the Host Mapping Table needs to be deleted, check the check box of the undesired entry and click Delete.