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ng_cisco(4)

The  node  type  performs  encapsulation  and de-encapsulation of
packets using the Cisco HDLC protocol.  This is a  fairly  simple
protocol  for  the transmission of packets across high speed syn‐
chronous lines.  Each packet is prepended with an Ethertype,  in‐
dicating  the  protocol.  There is also a and an capability.  The
hook should connect to the synchronous line.  On the  other  side
of the node are the and hooks, which transmit and receive raw IP,
IPv6,  AppleTalk, and IPX packets, respectively.  Typically these
hooks would connect to the corresponding hooks on an  type  node.
In  order  to  function properly for IP traffic, the node must be
informed of the local IP address and netmask  setting.   This  is
because the protocol includes an packet which we must be prepared
to  answer.   There are two ways to accomplish this, manually and
automatically.  Whenever such an inquire packet is received,  the
node  sends  a  control message to the peer node connected to the
hook (if any).  If the peer responds, then that response is used.
This is the automatic method.  If the peer does not respond,  the
node  falls  back on its cached value for the IP address and net‐
mask.  This cached value can be set at any time with  a  message,
and  this  is the manual method.  If the hook is connected to the
hook of an node, as is usually the case,  then  configuration  is
automatic  as  the  understands the message.  This node type sup‐
ports the following hooks:  The  connection  to  the  synchronous
line.   IP  hook.   IPv6  hook.  AppleTalk hook.  IPX hook.  This
node type supports the generic control messages, plus the follow‐
ing: This command takes an array of two arguments.  The first  is
the  IP  address of the corresponding interface and the second is
the netmask.  This command returns the IP  configuration  in  the
same format used by This command is also by this node type to the
peer  whenever an IP address inquiry packet is received.  Returns
a struct ngciscostat {
  uint32_t   seqRetries;        /* # unack'd retries */
  uint32_t   keepAlivePeriod;   /* in seconds  */  };  This  node
shuts  down  upon receipt of a control message, or when all hooks
have been disconnected.  is a trademark of  Cisco  Systems,  Inc.
The node type was implemented in Not all of the functionality has
been  implemented.  For example, the node does not support query‐
ing the remote end for its IP address and netmask.




























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