System Manual

Page 29
PDN is for Management and additional PDN is for data traffic. For "single PDN" mode, set this
parameter to "combined".
Device Name, Host Name and Domain Name are optional parameters, used e.g. in DHCP.
Recommended to leave the default values.
MTU – defines the Maximum Transmit Unit (maximum IP-level datagram size) before IP-layer
fragmentation. 3GPP recommends use of 1400 bytes (default) to avoid packet drops and
fragmentation on S1-U interface between eNB and EPC. Use the default value (1400).
IP Type – defines the IP stack of the CPE. The following values are available – IPv4, IPv6,
IPv4v6 (dual stack). Set to IPv4.
 VPN Setting Under Router Mode
This section allows user to configure VPN service for selected connection mode. In router
mode (Layer 3 bridge) - PPTP, L2TP and GRE can be selected. Note: This mode is not
supported and not recommended to be used. Alternatively, In L2 Bridge mode, L2 GRE can
be configured as part of Telrad Layer 2 solution end-to-end solution.
The router mode VPN configuration is shown below.
 L2 bridge mode
The following parameters should be configured (please, refer to the settings shown in the
below screenshot):
Connection Mode – defines the CPE networking mode. Should be set to "L2 Bridge"
MGMT and Data interface – not relevant for the L2 bridge mode. Leave default value
"combined".
MTU – defines the Maximum Transmit Unit (maximum IP-level datagram size) before IP-layer
fragmentation. For L2 traffic, it should be changed to "Manual" with value "1600" (bytes). The
actual supported L2 datagram maximum packet size will be 1576 bytes.
IP Type – defines the IP stack of the CPE. The following values are available – IPv4, IPv6,
IPv4v6 (dual stack). Set to IPv4.