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    The following form allows you to view linux man pages.

    Command:

    ng_iface

    
    
    
    

    DESCRIPTION

         An iface node is both a netgraph node and a system networking interface.
         When an iface node is created, a new interface appears which is accessi-
         ble via ifconfig(8).  Iface node interfaces are named ng0, ng1, etc.
         When a node is shutdown, the corresponding interface is removed and the
         interface name becomes available for reuse by future iface nodes; new
         nodes always take the first unused interface.  The node itself is
         assigned the same name as its interface, unless the name already exists,
         in which case the node remains unnamed.
    
         An iface node has a single hook corresponding to each supported protocol.
         Packets transmitted via the interface flow out the corresponding proto-
         col-specific hook.  Similarly, packets received on a hook appear on the
         interface as packets received into the corresponding protocol stack.  The
         currently supported protocols are IP, IPv6, AppleTalk, IPX, ATM, NATM,
         and NS.
    
         An iface node can be configured as a point-to-point interface or a broad-
         cast interface.  The configuration can only be changed when the interface
         is down.  The default mode is point-to-point.
    
         Iface nodes support the Berkeley Packet Filter (BPF).
    
    
    

    HOOKS

         This node type supports the following hooks:
    
         inet    Transmission and reception of IP packets.
    
         inet6   Transmission and reception of IPv6 packets.
    
         atalk   Transmission and reception of AppleTalk packets.
    
         ipx     Transmission and reception of IPX packets.
    
         atm     Transmission and reception of ATM packets.
    
         natm    Transmission and reception of NATM packets.
    
         ns      Transmission and reception of NS packets.
    
    
    

    CONTROL MESSAGES

         This node type supports the generic control messages, plus the following:
    
         NGM_IFACE_GET_IFNAME
              Returns the name of the associated interface as a NUL-terminated
              ASCII string.  Normally this is the same as the name of the node.
    
         NGM_IFACE_GET_IFINDEX
              Returns the global index of the associated interface as a 32 bit
              integer.
    
         associated interface is removed and becomes available for use by future
         iface nodes.
    
         Unlike most other node types, an iface node does not go away when all
         hooks have been disconnected; rather, and explicit NGM_SHUTDOWN control
         message is required.
    
    
    

    ALTQ Support

         The ng_iface interface supports ALTQ bandwidth management feature.  How-
         ever, ng_iface is a special case, since it is not a physical interface
         with limited bandwidth.  One should not turn ALTQ on ng_iface if the lat-
         ter corresponds to some tunneled connection, e.g. PPPoE or PPTP.  In this
         case, ALTQ should be configured on the interface that is used to transmit
         the encapsulated packets.  In case when your graph ends up with some kind
         of serial line, either synchronous or modem, the ng_iface is the right
         place to turn ALTQ on.
    
    
    

    SEE ALSO

         altq(4), bpf(4), netgraph(4), ng_cisco(4), ifconfig(8), ngctl(8)
    
    
    

    HISTORY

         The iface node type was implemented in FreeBSD 4.0.
    
    
    

    AUTHORS

         Archie Cobbs <archie@FreeBSD.org>
    
    
    

    BSD October 28, 2005 BSD

    
    
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