Sierra Wireless 20070914 - Manual (Page 79)

Data Communication and Host Modes
Rev 3.0B Feb.08 66
Figure 8-5: AceManager : PPP/Ethernet
Using a private IP insulates the PPP client from changes in IP
addresses of the underlying network. The will perform basic
NAT‐like address translation on all packets.
If a public IP address is being used, any changes in the IP (as
determined by the wireless network) will result in the PPP link
to the host being disconnected, requiring the host to reinitiate
it. The public IP is passed to the host in the PPP negotiations,
so when the network forces a change, the modem has to force
the host to renegotiate the PPP link to make this happen.
SLIP
SLIP mode is entered be using the “AT\ASLIP” command. As
in PPP Mode, the IP address that the host assumes is affected
by the setting of *HOSTPRIVMODE. SLIP does not negotiate
the IP address with the connected device or computer, so
before making a SLIP connection, the SLIP driver on that
device or computer must be configured to use the IP address
specified by querying S110.
UDP and UDP Pad
When the modem is in UDP PAD (Packet Assembly and Disas‐
sembly) Mode, all characters received on the serial port are
assembled into UDP packets and sent to the remote IP
address/port or the PinPoint X, and any packets received from
the same IP/port‐destined for the device port of PinPoint X (see
*DPORT)‐‐are disassembled and dumped onto the serial line.
A UDP session is initiated by one of the following events:
• Using the Dial UDP (DP) AT command (example,
ATDP192.168.3.23/3456).