Cisco Cisco Packet Data Gateway (PDG)

 

▄  SaMOG Administration Guide, StarOS Release 18 

24 

The WLC forwards the packet to UE. 

25 

Another uplink data packet with the source IP address (a.b.c.d) is sent to WLC through the CAPWAP tunnel by UE. 

26 

WLC encapsulates the same packet into GRE/EoGRE tunnel and sends it to SaMOG 

27 

SaMOG matches this packet with the ACL configured in the forward and NAT policy. Here, the packet does not match the 
ACL.  

28 

SaMOG then routes the packet to PGW over the GTP tunnel. 

29 

PGW processes the packet and sends it to the Internet over the Gi interface, and receives a downlink packet from the 
Internet. 

30 

The downlink packet comes with the destination address set to a.b.c.d from PGW to SaMOG over the GTP tunnel. 

31 

The packet is forwarded to the WLC through the GRE/EoGRE tunnel. 

32 

WLC forwards the packet to UE. 

 

The following limitations, restrictions, and dependancies apply for the Local Breakout - Basic model: 



 

For an L3IP access type, the IP address assigned by the P-GW or GGSN must be routable on the WLAN. 

SaMOG does not assign a separate IP address for the UE. 



 

The Flow-based LBO model will always require NAT to route the UE packets on the Internet directly.