Nokia M1122 User Manual
Also see for M1122: Administrator's manualUser manual
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M1122 User Manual Copyright Nokia Networks Oy C33906002SE_0018 RFC2364 Virtual circuit multiplexed PPP over AAL5 (PPP-VC) RFC2364 Virtual circuit multiplexed PPP over AAL5 used totunnel LAN/VBRIDGE PPTP packets(TUNNELED-PPP-VC)If an IP address is given to a virtual channel interface and bridging isenabled at that interface, then IP data at that interface is routed and allother protocols are bridged. The only encapsulation which allows bothbridging and routing simultaneously is ETH-LLC. For example, it ispossible to route ETH-LLC encapsulated packets and at the same timebridge, for example, PPPoE packets (PPPoE packets are transporteddirectly over Ethernet frame, not within IP packets).4.2 RoutingRouting is based on routing entries in a routing table. Static routes areadded via the management interface and dynamic routing is done usingRIP and RIPv2. Routing is done between the Ethernet 10Base-Tinterface and the virtual channel connection (VCC) of the ATM/ADSLinterface. M1122 supports up to 8 simultaneous VCCs.M1122 supports IGMP (Internet Group Management Protocol) proxyreceive function for IP multicast applications.4.3 BridgingBridging is supported to provide full protocol transparency. Bridgingcan be used simultaneously with IP routing. M1122 works as aself-learning bridge supporting up to 1024 MAC addresses. Bridgingis done between the Ethernet 10Base-T interface and each ATM VCCinterface. Optionally, the bridging between the VCCs can be disabled.4.4 Network Address Port TranslationM1122 supports Network Address Port Translation (NAPT) forTCP/IP, UDP/IP and ICMP/IP protocols. When NAPT is used, a singleIP 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 theVCC. NAPT translates the IP source address and source port numberdynamically to the VCC IP address and port number. Similarly,packets coming from the VCC are mapped back to the originaldestination addresses. NAPT allows up to hundreds of hosts to share a |
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