Routing; Bridging; Network Address Port Translation - Nokia M11 T66220 User Manual

M11 supports IGMP (Internet Group Management Protocol) proxy
function for IP multicast applications.

Routing

Routing is based on routing entries in a routing table. Static routes are
added via the management interface and dynamic routing is done using
RIP and RIPv2. Routing is done between the Ethernet 10Base-T
interface and the virtual channel connection (VCC) of the ATM/ADSL
interface. Optionally, the routing between the VCCs can be disabled.
M11 supports up to 8 simultaneous VCCs.

Bridging

Bridging is supported to provide full protocol transparency. Bridging
can be used simultaneously with IP routing. M11 works as a
self-learning bridge supporting up to 256 MAC addresses. Bridging is
done between the Ethernet 10Base-T interface and each ATM VCC
interface. Optionally, the bridging between the VCCs can be disabled.
M11 supports up to 8 simultaneous VCCs.

Network Address Port Translation

M11 supports Network Address Port Translation (NAPT) for TCP/IP
and UDP/IP protocols. When NAPT is used, a single IP address is
allocated to a VCC which leads to the public IP network. The Ethernet
subnet has private IP addressing and is not visible to the VCC. NAPT
translates the IP source address and source port number dynamically to
the VCC IP address and port number. Similarly, packets coming from
the VCC are mapped back to the original destination addresses. NAPT
allows up to 253 hosts to share a single VCC IP address to the public
network. The Network Address Port Translation principle is presented
in Figure 2-4.
Home network (LAN)
src:192.168.1.112:1228
dst:194.112.11.111:80
src:194.112.11.111:80
dst:192.168.1.112:1228
Figure 2-4
C33833001SE_00
NAPT router
Principle of Network Address Port Translation
E Copyright Nokia Networks Oy
Applications and features
Internet (WAN)
src:195.112.12.161:1234
dst:194.112.11.111:80
src:194.112.11.111:80
dst:195.112.12.161:1234
2-5