Configuring Icmp Messages; Dns; Configuring The Internal Dns Table - AudioCodes Mediant 800B User Manual

12.7

Configuring ICMP Messages

Internet Control Message Protocol (ICMP) is one of the core protocols of the Internet
Protocol suite. It is used by network devices such as routers to send error messages
indicating, for example, that a requested service is unavailable.
You can configure the device to handle ICMP messages as follows:

Send and receive ICMP Redirect messages.

Send ICMP Destination Unreachable messages. The device sends this message in
response to a packet that cannot be delivered to its destination for reasons other than
congestion. The device sends a Destination Unreachable message upon any of the
following:
•
Address unreachable
•
Port unreachable
This feature is applicable to IPv4 and IPv6 addressing schemes.
The following procedure describes how to configure ICMP messaging in the Web interface.
You can
DisableICMPUnreachable (ICMP Unreachable messages) and DisableICMPRedirects
(ICMP Redirect messages).

To configure handling of ICMP messages:
1. Open the Network Settings page (Configuration tab > VoIP menu > Network >
Network Settings).
Figure 12-9: Configuring ICMP Messaging in Network Settings Page
2. To enable or disable sending and receipt of ICMP Redirect messages, use the 'Send
and Receive ICMP Redirect Messages' parameter.
3. To enable or disable the sending of ICMP Destination Unreachable messages, use
the 'Send ICMP Unreachable Messages' parameter.
4. Click Submit.
12.8

DNS

You can use the device's embedded domain name server (DNS) or an external, third-party
DNS to translate domain names into IP addresses. This is useful if domain names are used
as the destination in call routing. The device supports the configuration of the following
DNS types:

Internal DNS table - see ''Configuring the Internal DNS Table'' on page

Internal SRV table - see ''Configuring the Internal SRV Table'' on page

12.8.1 Configuring the Internal DNS Table

The Internal DNS table, similar to a DNS resolution, translates up to 20 host (domain)
names into IP addresses. This functionality can be used when a domain name (FQDN) is
configured as an IP destination in a routing rule. Up to four different IP addresses can be
assigned to the same host name. This is typically used for alternative Tel-to-IP call routing.
User's Manual
also configure ICMP
Mediant 800B Gateway and E-SBC
messaging using
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the ini file parameters
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Document #: LTRT-10286