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netstat 引数とは何ですか。また、引数とは何を意味しますか。

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ONTAP 9

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  • netstat の引数は ONTAP のバージョンによって異なります。使用して netstat いる ONTAP のバージョンに対応した引数と、各引数の表示内容を確認するためのノードシェルのマニュアルページを参照することを推奨します。
  • netstat マニュアルページを表示するには、次のコマンドを使用します。
    • node run -node local man netstat
    • ONTAP 9.9 の出力例
node run -node local man netstat NETSTAT(1) NETSTAT(1) NAME netstat - show network status DESCRIPTION The netstat command symbolically displays the contents of various network-related data structures. There are a num- ber of output formats, depending on the options for the information presented. netstat [-AaCcELnOoPSTUWxy] [-v vserver_id] [-f proto- col_family | -p protocol] [-M core] [-N system] Display a list of active sockets (protocol control blocks) for each network protocol, for a particular protocol_family , or for a single protocol. If -v is present, display the output specific to the par- ticular vserver id requested. If -A is also pre- sent, show the address of a protocol control block (PCB) associated with a socket; used for debugging. If -a is also present, show the state of all sock- ets; normally sockets used by server processes are not shown. If -L is also present, show the size of the various listen queues. The first count shows the number of unaccepted connections, the second count shows the amount of unaccepted incomplete connections, and the third count is the maximum number of queued connections. If -S is also pre- sent, show network addresses as numbers (as with -n) but show ports symbolically. If -x is present, display socket buffer and tcp timer statistics for each internet socket.If -U is present, display the time of the last received upcall, the last sent upcall and the last read for each active socket. If -P is present, display the per TCP connection statistics. If -E is present, display the total bytes sent and received per connection. If -e is present, display the total raw bytes sent and received per connection. If -O is present, display the application id associated with the connection and/or the Type of Service value for QOS Marking if enabled. If -C is present, display the connection group id for the connection. If -c is present, dis- play the congestion window details for TCP connec- tions. If -o is present, display the number of route looksups done for the connection. If -y is present, display the connections that met the extreme flow control condition The output displays the local and remote address of the connection, the count of the number of times the connection met the condition and the time. When -T is present, dis- play information from the TCP control block, including retransmits, out-of-order packets received, and zero-sized windows advertised. netstat -i | -I interface [-abdhnW] [-f address_family] [-M core] [-N system] Show the state of all network interfaces or a sin- gle interface which have been auto-configured (interfaces statically configured into a system, but not located at boot time are not shown). An asterisk (''*'') after an interface name indicates that the interface is (''down''). If -a is also present, multicast addresses currently in use are shown for each Ethernet interface and for each IP interface address. Multicast addresses are shown on separate lines following the interface address with which they are associated. If -b is also pre- sent, show the number of bytes in and out. If -d is also present, show the number of dropped packets. If -h is also present, print all counters in human readable form. If -W is also present, print inter- face names using a wider field size. netstat -w wait [-I interface] [-d] [-M core] [-N system] [-q howmany] At intervals of wait seconds, display the informa- tion regarding packet traffic on all configured network interfaces or a single.I interface. If -q is also present, exit after howmany outputs. If -d is also present, show the number of dropped pack- ets. netstat -s [-s] [-z] [-f protocol_family | -p protocol] [-M core] [-N system] Display system-wide statistics for each network protocol, for a particular protocol_family ,or for a single protocol. If -s is repeated, counters with a value of zero are suppressed. If -z is also pre- sent, reset statistic counters after displaying them. netstat -i | -I interface -s [-f protocol_family | -p protocol] [-M core] [-N system] Display per-interface statistics for each network protocol, for a particular protocol_family ,or for a single protocol. netstat -m [-M core] [-N system] Show statistics recorded by the memory management routines mbuf(9). The network manages a private pool of memory buffers. netstat -B [-z] [-I interface] Show statistics about bpf(4) peers. This includes information like how many packets have been matched, dropped and received by the bpf device, also information about current buffer sizes and device states. netstat -r [--AaGnW] [-F fibnum] [-f address_family] [-M core] [-N system] Display the contents of routing tables. When -f is specified, a routing table for a particular address_family is displayed. When -F is specified, a routing table with the number fibnum is dis- played. If the specified fibnum is -1 or -F is not specified, the default routing table is displayed. If -A is also present, show the contents of the internal Patricia tree structures; used for debug- ging. If -a is also present, show protocol-cloned routes (routes generated by an RTF_PRCLONING parent route); normally these routes are not shown. When -W is also present, show the path MTU for each route, and print interface names with a wider field size. If the -G is also present, the routing tables for all active fibnums are displayed. netstat -rs [-s] [-M core] [-N system] Display routing statistics. If -s is repeated, counters with a value of zero are suppressed. netstat -g [-W] [-f address_family] [-M core] [-N system] Display the contents of the multicast virtual interface tables, and multicast forwarding caches. Entries in these tables will appear only when the kernel is actively forwarding multicast sessions. This option is applicable only to the inet and inet6 address families. netstat -gs [-s] [-f address_family] [-M core] [-N system] Show multicast routing statistics. If -s is repeated, counters with a value of zero are sup- pressed. netstat -Q Show netisr(9) statistics. The flags field shows available ISR handlers: C NETISR_SNP_FLAGS_M2CPUID Able to map mbuf to cpu id D NETISR_SNP_FLAGS_DRAINEDCPU Has queue drain handler F NETISR_SNP_FLAGS_M2FLOW Able to map mbuf to flow id Some options have the general meaning: -f address_family, -p protocol Limit display to those records of the specified address_family or a single protocol. The follow- ing address families and protocols are recognized: inet(AF_INET) divert , icmp , igmp , ip , ipsec , pim, sctp , tcp , udp inet6(AF_INET6) icmp6 , ip6 , ipsec6 , rip6 , tcp , udp pfket(PF_KEY) pfkey atalk(AF_APPLETALK) ddp netgraph(AF_NETGRAPH) ctrl , data ipx(AF_IPX) ipx , spx unix(AF_UNIX) None link(AF_LINK) None The program will complain if protocol is unknown or if there is no statistics routine for it. -M Extract values associated with the name list from the specified core instead of the default /dev/kmem. -N Extract the name list from the specified system instead of the default, which is the kernel image the system has booted from. -n Show network addresses and ports as numbers. Normally netstat attempts to resolve addresses and ports, and dis- play them symbolically. -W In certain displays, avoid truncating addresses even if this causes some fields to overflow. 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 ''net- work.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 databases hosts(5) and networks(5), 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 IPv4 ''dot format'', refer to inet(3). Unspecified, or ''wildcard'', addresses and ports appear as ''*''. The interface display provides a table of cumulative statistics regarding packets transferred, errors, and col- lisions. 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 status. Each route consists of a destination host or network, and a gateway to use in forwarding pack- ets. The flags field shows a collection of information about the route stored as binary choices. The individual flags are discussed in more detail in the route(8) and route(4) manual pages. The mapping between letters and flags is: 1 RTF_PROTO1 Protocol specific routing flag #1 2 RTF_PROTO2 Protocol specific routing flag #2 3 RTF_PROTO3 Protocol specific routing flag #3 B RTF_BLACKHOLE Just discard pkts (during updates) b RTF_BROADCAST The route represents a broad- cast address C RTF_CLONING Generate new routes on use c RTF_PRCLONING Protocol-specified generate new routes on use D RTF_DYNAMIC Created dynamically (by redi- rect) G RTF_GATEWAY Destination requires forwarding by intermediary H RTF_HOST Host entry (net otherwise) L RTF_LLINFO Valid protocol to link address translation M RTF_MODIFIEDL Modified dynamically (by redi- rect) R RTF_REJECT Host or net unreachable S RTF_STATIC Manually added U RTF_UP Route usable W RTF_WASCLONED Route was generated as a result of cloning X RTF_XRESOLVE External daemon translates proto to link address 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 connection- less 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. When netstat is invoked with the -w option and a wait interval argument, it displays a running count of statis- tics related to network interfaces. An obsolescent version of this option used a numeric parameter with no option, and is currently supported for backward compatibility. By default, this display summarizes information for all interfaces. Information for a specific interface may be displayed with the -I option. The bpf(4) flags displayed when netstat is invoked with the -B option represent the underlying parameters of the bpf peer. Each flag is represented as a single lower case letter. The mapping between the letters and flags in order of appearance are: p Set if listening promiscuously i BIOCIMMEDIATE has been set on the device f BIOCGHDRCMPLT status: source link addresses are being filled automatically s BIOCGSEESENT status: see packets originating locally and remotely on the interface. a Packet reception generates a signal l BIOCLOCK No status: descriptor has been locked For more information about these flags, please refer to bpf(4). The -x flag causes netstat to output all the information recorded about data stored in the socket buffers. The fields are: R-MBUF Number of mbufs in the receive queue. S-MBUF Number of mbufs in the send queue. R-CLUS Number of clusters, of any type, in the receive queue. S-CLUS Number of clusters, of any type, in the send queue. R-HIWA Receive buffer high water mark, in bytes. S-HIWA Send buffer high water mark, in bytes. R-LOWA Receive buffer low water mark, in bytes. S-LOWA Send buffer low water mark, in bytes. R-BCNT Receive buffer byte count. S-BCNT Send buffer byte count. R-BMAX Maximum bytes that can be used in the receive buffer. S-BMAX Maximum bytes that can be used in the send buffer. SEE ALSO fstat(1), nfsstat(1), procstat(1), ps(1), sockstat(1), bpf(4), inet(4), route(4), unix(4), hosts(5), networks(5), protocols(5), services(5), iostat(8), route(8), trpt(8), vmstat(8), mbuf(9) HISTORY The netstat command appeared in 4.2BSD. IPv6 support was added by WIDE/KAME project. BUGS The notion of errors is ill-defined. May 17, 2013 NETSTAT(1) ing by intermediary

追加情報

ONTAP のバージョンでバグ1278897の修正が含まれていない場合、netstatコマンドを使用するとエラーが発生することがあります。

netstatを使用して、ONTAP 9.5以降のネットワーク問題のトラブルシューティングを行う方法

 

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