59
W&T The basis configuration of the Com-Server
Subject to error and alteration
only after closing the current Telnet connection using q.
n
DNS Server (Default: 0.0.0.0)
The entry contains the IP address of the DNS server (Do-
main Name System). The latter is needed in all client mo-
des of the Com-Server (TCP, UDP, Telnet, FTP client) if the
destination system is to be stored in the configuration not
as a numerical IP address, but rather in the form of a host
name or URL. The name is resolved by the Com-Server is
done via UDP using standard port 53 reserved for the DNS.
The Time-To-Live of the IP address resolved for a host
name is determined by the Time-To-Live parameter contai-
ned in the response from the DNS server. After the name
has been successfully resolved this time is displayed in the
menu item Setup Port x r Port State r Connection State.
n
MTU – Maximum Transfer Unit (Default: 560)
This value determines the maximum size of a TCP/IP pak-
ket. It refers to the number of bytes (excluding header)
that can be sent in a packet. The smaller the MTU, the
more network buffer overall is available in the Com-Server.
The selectable range begins at 560 and ends at 1024
bytes. The values can be set in increments of 128 bytes
(automatic correction).
n
DHCP Client (Default: 1 = ON)
The DHCP protocol is activated with the factory settings
(menu entry = 1). The Com-Server attempts to find a DHCP
server and get an IP address from it. Entering 0 deactiva-
tes DHCP and the Com-Server works statically with the IP
address assigned to it. More information on how DHCP
works can be found in the section IP Assignment via DHCP
Protocol.
1
To prevent unintended address assignments or
changes, we recommend deactivating the DHCP pro-
tocol if it is not expressly used in the respective network
environment.
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