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multi access

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  • multi access

    با سلام
    روتینگ در شبکه multiaccess چگونه هست؟
    که trace کلاینت بار اول با متفاوت هست با دفعه های بعد شبکه static روت هست

  • #2
    در شبکه multicast باید عضو یک گروه مولتی کستی باشند تا پکت دریافت کنند،الان مشکل شما کجاست؟

    Routing

    Each host (and in fact each application on the host) that wants to be a receiving member of a multicast group (i.e. receive data corresponding to a particular multicast address) must use the Internet Group Management Protocol (IGMP) to join. Adjacent routers also use this protocol to communicate.
    In unicast routing, each router examines the destination address of an incoming packet and looks up the destination in a table to determine which interface to use in order for that packet to get closer to its destination. The source address is irrelevant to the router. However, in multicast routing, the source address (which is a simple unicast address) is used to determine data stream direction. The source of the multicast traffic is considered upstream. The router determines which downstream interfaces are destinations for this multicast group (the destination address), and sends the packet out through the appropriate interfaces. The term reverse path forwarding is used to describe this concept of routing packets away from the source, rather than towards the destination.
    A number of errors can happen if packets intended for unicast are accidentally sent to a multicast address; in particular, sending ICMP packets to a multicast address has been used in the context of DoS attacks as a way of achieving packet amplification.
    On the local network, multicast delivery is controlled by IGMP (on IPv4 network) and MLD (on IPv6 network); inside a routing domain, PIM or MOSPF are used; between routing domains, one uses inter-domain multicast routing protocols, such as MBGP.
    The following are some common delivery and routing protocols used for multicast distribution:
    • Internet Group Management Protocol (IGMP)
    • Protocol Independent Multicast (PIM)
    • Distance Vector Multicast Routing Protocol (DVMRP)
    • Multicast Open Shortest Path First (MOSPF)
    • Multicast BGP (MBGP)
    • Multicast Source Discovery Protocol (MSDP)
    • Multicast Listener Discovery (MLD)
    • GARP Multicast Registration Protocol (GMRP)

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