Dns Resolver; Dns Resolver Features - Avaya G250 Administration

DNS Resolver

A DNS Resolver resolves host names to IP addresses. It does this by querying DNS servers
according to an ordered list. The list of DNS servers is compiled using either DNS servers
entered manually by the user, or DNS servers gathered automatically by means of DHCP or
PPP protocols, or both.
The user can also optionally aid the DNS Resolver by specifying a list of domain names that the
DNS Resolver adds as a suffix to non-FQDN (Fully Qualified Domain Name) names, to help
resolve them to an IP address.
The DNS Resolver feature is intended to provide a backup mechanism for VPN hubs using
DNS. For more information about VPNs on the G250 and G350, see
page 447.

DNS Resolver Features

The G250/G350 supports the following DNS Resolver features:
Fully compliant with RFC1034, RFC1035 and RFC1123.
●
Maintains a global DNS database for all interfaces. The database is compiled using:
●
Static (user-defined) DNS servers.
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Automatically-learned DNS servers. DNS servers can be automatically learned by the
●
Fast Ethernet 10/2 interface when it is configured as a DHCP client or configured for
PPP. For more information on DHCP Client, see
page 180.
Note:
The following PPP interfaces can be configured to automatically learn the DNS
Note:
servers in the system:
- Fast Ethernet with PPPoE
- Dialer interface
- Serial interface
The most common application of this configuration is for connecting the G250/G350 to
the Internet and getting the DNS server information from the ISP. Therefore, interfaces
configured to automatically learn the DNS servers in the system are usually the Fast
Ethernet with PPPoE interface and the Dialer interface.
Configuring IPSec VPN on
Configuring DHCP client
Issue 3 February 2007
DNS Resolver
on
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