EWB100 Usage and Deployment Guide
Rev 1.13
Page 80
This approach, while simple, can cause problems if the IP address of the FTP
can change or is different for every site. A more flexible approach is to specify
the DNS name of the FTP via the server parameter. The command is:
set airb server ftp_dns_name
where ftp_dns_name is the DNS name of the FTP server. When the name
specified the EWB will make a DNS inquiry to obtain the DNS name to IP
address mapping. The IP address of the DNS server can be specified either
statically in the network command or as a DHCP option. For systems that use
DHCP, the latter approach is generally used and will yield both the IP address of
the DNS server as well as the domain name.
The specified name can be either a fully or partially qualified DNS name. If fully
qualified, the name will be submitted as specified to the DNS server. An example
would be:
If partially qualified it will be concatenated with the local domain name and
submitted to the DNS server. Hence if the server name is
domain name is: store123.retailer.com then the combined name would be
ftp.server.store123.retailer.com
As noted above, the domain name is usually included as an option in the DHCP
response. The option of whether to append or not is con
trolled by the “append”
parameter in the network configuration. The command is:
set network append enable/disable
Append is disabled by default.
One can show the DNS mappings via the command: “show dns” which will list
the name to IP address mappings as well as the domain name and IP address of
the DNS server.
In terms of precedence, the server name takes priority over the ip_ab address as
follows.
If the server name is equal to “0” ( string containing the character 0) , then the
ip_ab address is used.
If the server name is not equal to “0”, then the server name is used and the
contents of the ip_ab parameter is not used, even if the server name does not
resolve to an ip address. If the device cannot resolve the DNS name, the
airbeam process is aborted.
The default server name is “0” and so by default the ip_ab address is used.
The fourth way to obtain the FTP server IP address is via DHCP option 160. If
this parameter is specified in the DHCP response, the IP address contained in it
Summary of Contents for TEAM Badge (EWB100)
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