Motorola V186 User Manual - Page 107
IP Conversion Table Enhancements, Using Host Names, To enable
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Communications IP Conversion Table Enhancements An IP conversion table can be assigned to each RTU/FEP. It maps each site ID+link ID (port) to an IP address. The link ID column supports multiple MDLC over IP ports per RTU. Each link ID uniquely identifies the port/IP connection of that RTU. The table enables the MDLC over IP port to transmit MDLC packet to its destination based upon its site ID and link ID (port). The enhanced IP conversion table also supports the user of a host name instead of a numeric IPv4 address (IP address). In order to use host names, the operator must support this in the network DNS Server, and the user must specify them in the appropriate port configuration. The IP conversion table is dynamic, which means its numeric addresses are automatically learned/updated in runtime, for example when a new RTU is added, or an existing one changes its addresses. In some cases, such as dynamic addresses of RTUs, there is no need to download that table to FEP, simply because RTUs addresses are updated when they transmit to the FEP. In this case, it is recommended that the user application perform these transmissions periodically. Note: The IP conversion table learns only numeric IP addresses. Host names of other RTUs are not learned. Using Host Names Sometime it is necessary to refer to an RTU or FEP using a host name rather than a numeric IP addresses. Any MDLC over IP port (Ethernet or RS232/PPP) has that option, however it is the responsibility of the user and network to make sure this is supported. In the IP conversion table, it is possible to set a host name instead of a numeric IP address for a specific site + link ID. The link ID, for example LINE5, identifies the port/IP connection of that site. To enable this, the port needs the list of DNS servers for that MDLC over IP port. DNS list can be automatically learned. The list must be set only for an Ethernet port configured as Static IP address mode. An Ethernet port configured as DHCP or an RS232 port configured as PPP automatically learns this list from the network, and the user does not need to set them. Note: Some PPP connected radios such as TETRA and ASTRO IV&D radios do not provide DNS information. These systems usually do not use host names either, but if necessary, the user can set the list of DNS Servers in the port configuration. The FQDN option for an Ethernet port configured as DHCP updates the DNS servers when a new IP address is allocated to it by DHCP. The user need only set the full host name of that port. A warning is logged if the router/DHCP server does not support this option. 103