Dns Caching - Mitel 6867i Administrator's Manual

Mitel 6800 Series SIP Phone Release 4.2.0 Administrator Guide

DNS CACHING

The IP phones have the ability to cache DNS requests as referenced in RFC1035 and RFC2181.
The phone caches DNS lookups according to the TTL field, so that the phone only performs
another lookup for an address when the TTL expires.
CONFIGURING NETWORK SETTINGS MANUALLY
If you disable DHCP on your phone, you need to configure the following network settings
manually:
• IP Address
• Subnet Mask
• Gateway
• Primary DNS
• Secondary DNS
Note: If you disable DHCP on the phone, the phone uses the TFTP protocol as the
default server protocol. If you want to specify a different protocol to use, see
"Configuration Server Protocol"
You can configure the network settings using the configuration files, the IP phone UI, or the
Mitel Web UI.
Errors Messages Display when Incorrect Network Settings Entered
The IP Phone UI AND the Mitel Web UI immediately notify the Administrator if an incorrect
value is being entered for the following network parameters in the IP Phone UI and the Mitel
Web UI:
• A 0.0.0.0 entered as values for the IP Address, Subnet Mask and Gateway parameters
• IP Address and Gateway IP address parameter values entered exactly the same
• Gateway IP address and the IP address parameter values configured on the same subnet
If you configure the Gateway parameter and the IP Address parameter on the same subnet,
the following error message displays:
"Gateway IP address and the IP address parameter values configured
are not on the same subnet".
CONFIGURATION FILES
For specific parameters you can set in the configuration files, see Appendix A, the section,
"Network Settings"
4-23
on page
on page A-9.
4-99.