Dns Address Configuration; Check Connection To Mobile Network Configuration - Advantech ER75s User Manual

Tips for working with the Mobile WAN configuration form:
If the size is set incorrectly, data transfer may not be succeeded. By setting a lower MTU
it occurs to more frequent fragmentation of data, which means higher overhead and also
the possibility of damage of packet during defragmentation. On the contrary, the higher
value of MTU can cause that the network does not transfer the packet.
If the IP address field is not filled in, the operator automatically assigns the IP address
when it is establishing the connection. If filled IP address supplied by the operator, router
accelerate access to the network.
If the APN field is not filled in, the router automatically selects the APN by the IMSI code
of the SIM card. If the PLMN (operator number format) is not in the list of APN, then
default APN is "internet". The mobile operator defines APN.
If the word blank is filled in the APN field, router interprets APN as blank.
ATTENTION:
If only one SIM card is plugged in the router (router has one slot for a SIM card),
router switches between the APN.
Correct PIN must be filled. For SIM cards with two APN's there will be the same
PIN for both APN's. Otherwise the SIM card can be blocked by false SIM PIN.
Items marked with an asterisk must be filled in only if this information is required by the op-
erator (carrier).
In case of unsuccessful establishing a connection to mobile network is recommended to
check the accuracy of entered data. Alternatively, try a different authentication method or
network type.
8.10.2 DNS address configuration
The DNS Settings item is designed for easier configuration on the client side. When this
item is set to the value get from opertor router makes an attempt to automatically get an IP
address of the primary and secondary DNS server from the operator. By way of contrast, set
manually option allows you to set IP addresses of Primary DNS servers manually (using the
DNS Server item).
8.10.3 Check connection to mobile network configuration
If the Check Connection item is set to enabled or enabled + bind, checking the connection
to mobile network is activated. Router will automatically send ping requests to the specified
domain or IP address (Ping IP Address item) in regular time interval (Ping Interval). In case of
unsuccessful ping, a new one will be sent after ten seconds. If it fails to ping the IP address
of three times in a row, the router terminates the current connection and tries to establish new
ones. Checking can be set separately for two SIM cards or two APNs. As a ping address can
be used an IP address for which it is certain that it is still functional and is possible to send
ICMP ping (e.g. DNS server of operator).
40
ER75s