Virtual-Ppp Interface; Dhcp - Teldat -3Ge-USB User Manual

3 Configuring in Generic mode
!
!
tftp-server flash:fwethant.img 2
!
!
control-plane
!
!
!
line con 0
line aux 0
line vty 0 4
password cisco
login
!
end

3.2.1 Virtual-ppp Interface

The Cisco router configuration, to connect it to a WWAN network via a Teldat-3Ge-USB with L2TP, creates a virtual-
ppp interface. The router, through said interface, establishes an L2TP pseudowire tunnel to negotiate and establish a
PPP link with the WWAN mobile network.
The virtual-ppp interface configuration shows the configuration for the PPP parameters (pfc, acfc, chap), the
pseudowire definition with the tunnel destination address, which is the one assigned to the Teldat-3Ge-USB by DH-
CP. There are also commands to configure the NAT ports.
interface Virtual-PPP1
ip address negotiated
ip nat outside
ip virtual-reassembly
no cdp enable
ppp pfc local request
ppp pfc remote apply
ppp acfc local request
ppp acfc remote apply
ppp chap hostname internet
ppp chap password 0 internet
ppp timeout idle 60
pseudowire 172.24.78.28 1 pw-class pwclass1

3.2.2 DHCP

The Cisco router is the DHCP server for the Teldat-3Ge-USB. Said protocol is used to configure certain Teldat-
3Ge-USB parameters such as the SIM PIN, the WWAN mobile network APN and to tell the Teldat-3Ge-USB to op-
erate in generic mode.
ip dhcp pool ethant
host 172.24.78.28 255.255.0.0
client-identifier 7465.6c64.6174
bootfile fwethant.img
next-server 172.24.78.29
option 43 ascii antenna&routertype=generic&apn=internet.es&pin=5710
default-router 172.24.78.29
Use the bootfile option to give the Teldat-3Ge-USB the filename containing its application. Said application is auto-
matically downloaded from the indicated TFTP server, through the next-server option (provided this contains a more
updated version than the one currently running on the Teldat-3Ge-USB).
The client-identifier specifies the client-id the router must receive to accept the DHCP request from the Teldat-
3Ge-USB. Here, this is teldat in ASCII (74656c646174 in hexadecimal).
Use option 43 to pass the configuration parameters to the Teldat-3Ge-USB, so it can operate.
• The sent sentence syntax consists of parameters separated by the ' &' sign.
20
Teldat S.A.
Teldat-3Ge-USB User Manual