NAME

ntx_nstat − show network status

SYNOPSIS

ntx_nstat [ −d device ] [ −Aan ] [ −f address_family ]
ntx_nstat [ −d device ] [ −imnrstx ] [ −f address_family ]
ntx_nstat [ −d device ] [ −n ] [ −p protocol ]

DESCRIPTION

The ntx_nstat command symbolically displays the contents of various network-related data structures on the MVME339 board.  There are a number of output formats, depending on the options for the information presented.  The first form of the command displays a list of active sockets for each protocol.  The second form presents the contents of one of the other network data structures according to the option selected.  The third form displays statistics about the named protocol. 

OPTIONS

−A With the default display, show the address of any protocol control blocks associated with sockets; used for debugging. 

−a With the default display, show the state of all sockets; normally sockets used by server processes are not shown. 

−x With either interface display (option −i or an interval, as described below), show the number of dropped packets. 

−d Use device as the raw device filename.  This option overrides the default device name of /dev/rhp0. 

−i Show the state of interfaces which have been auto-configured (interfaces statically configured into a system, but not located at boot time are not shown). 

−m Show statistics recorded by the memory management routines (the network manages a private pool of memory buffers). 

−n Show network addresses as numbers (normally ntx_nstat
 
interprets addresses and attempts to display them symbolically). This option may be used with any of the display formats.

−p Show statistics about protocol , which is either a well-known name for a protocol or an alias for it.  Some protocol names and aliases are listed in the file /etc/protocols .  A null response typically means that there are no interesting numbers to report.  The program will complain if protocol is unknown or if there is no statistics routine for it. 

−s Show per-protocol statistics. 

−r Show the routing tables.  When −s is also present, show routing statistics instead. 

−f Limit statistics or address control block reports to those of the specified address_family .  The following address families are recognized: inet , for AF_INET. 

−t This option is only effective with the -i or -I options.  When used, it prints the if_timer field of the ifnet structure.  The field is the time until the watchdog timer is called. 

The default display, for active sockets, shows the local and remote addresses, send and receive queue sizes (in bytes), protocol, and the internal state of the protocol.  Address formats are of the form “host.port” or “network.port” if a socket’s address specifies a network but no specific host address.  When known the host and network addresses are displayed symbolically according to the data bases /etc/hosts and /etc/networks , respectively.  If a symbolic name for an address is unknown, or if the −n option is specified, the address is printed numerically, according to the address family.  For more information regarding the Internet “dot format,” refer to inet (3N).  Unspecified, or “wildcard”, addresses and ports appear as “∗”. 

The interface display provides a table of cumulative statistics regarding packets transferred, errors, and collisions.  The network addresses of the interface and the maximum transmission unit (“mtu”) are also displayed. 

The routing table display indicates the available routes and their statuses.  Each route consists of a destination host or network and a gateway to use in forwarding packets.  The flags field shows the state of the route (“U” if “up”), whether the route is to a gateway (“G”), whether the route was created dynamically by a redirect (“D”), and whether the route has been modified by a redirect (“M”).  Direct routes are created for each interface attached to the local host; the gateway field for such entries shows the address of the outgoing interface.  The refcnt field gives the current number of active uses of the route.  Connection-oriented protocols normally hold on to a single route for the duration of a connection while connectionless protocols obtain a route while sending to the same destination.  The use field provides a count of the number of packets sent using that route.  The interface entry indicates the network interface utilized for the route.