Operation and Configuration Guide 3.14
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Split Access
: This allows an incoming session to initiate on a link even when
the link is not the active (i.e. default route) link but is connected to the
network.
A.3.4 TTY Serial Port Link Configuration
Settings
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High Cost Link
: defines this link as High Cost, limiting the frequency and
amount of management data sent over the link.
•
Change Default MTU Size
: when enabled, allows the MTU size to be
changed from its default of 1500.
•
MTU Size
: the new MTU size to use.
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Auto Local IP
: Enables DHCP for this interface. The IP address will be
assigned by a DHCP server connected to the access point network. For most
applications, the IP addresses should be obtained automatically from the
network.
•
Local IP Address
: Used to specify the static IP address if Auto Local IP is
disabled.
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Masquerade
: This enables Network Address Translation for all LAN-origi-
nated traffic leaving the oMG WAN interface. This is almost always a
mandatory setting. Many Mobile Network Operators will disconnect a cellular
modem that emits IP datagrams which bear an address other than that of the
cellular modem.
•
Masquerade Port Range
: Auto/Manual—manual is the default and should be
used in most cases to avoid using “defined” or “reserved” ports.
•
Minimum/Maximum Port Number
: The range of ports to use for
masquerade. The default range is: 49152 to 65535. The minimum value is 0
and the maximum is 65535. If the minimum is set below 49152:
·
traffic on ports lower than 512 are mapped to other ports lower than 512.
·
traffic on ports 512 to 1024 are mapped to ports lower than 1024.
·
traffic on ports greater than 1024 are mapped to ports greater than 1024.
•
Automatic DNS
: if selected, the DNS server of the network service provider
will be used to resolve host names. If Automatic DNS is not selected, a
specific DNS server IP address can be specified in the Primary DNS and
Secondary DNS fields. Host names will be forwarded to the Primary DNS first
to be resolved. If the primary server fails to respond, the Secondary DNS will
be used. When a VPN is configured for use on the WAN interface, a typical
approach employs an enterprise DNS server as the primary server and the
secondary DNS server as the Mobile Network Operator-supplied server (or a
public server such as one at opendns.org).
•
Secondary DNS Servers
: specifies the IP address of a secondary domain
name server when Automatic DNS is disabled. This field may be left blank if
only one DNS is used.
•
Auto Remote IP
: Enables DHCP for this interface. The IP address will be
assigned by a DHCP server connected to the access point network. For most
purposes, the IP addresses should be obtained automatically from the
network.