The TCP/IP Guide - TCP/IP Network Status Utility (netstat)

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The TCP/IP Guide
9 TCP/IP Application Layer Protocols, Services and Applications (OSI Layers 5, 6 and 7)
9 TCP/IP Key Applications and Application Protocols
9 TCP/IP Administration and Troubleshooting Utilities and Protocols

TCP/IP DNS Registry Database Lookup Utility (whois/nicname)

TCP/IP Configuration Utilities (ipconfig, winipcfg and ifconfig)

TCP/IP Network Status Utility (netstat)
(Page 6 of 6)

Sample Windows netstat Output

The output from the Windows netstat program is fairly similar to that of the UNIX utility when the same or similar options are given, but the UNIX version usually provides more details. I have shown in Table 302 an example illustrating TCP/IP statistics on my home Windows XP machine, using “-p icmp” to restrict the output to ICMP stats only. Table 303 shows the routing table display from netstat (which I modified slightly to fit the size limits of the table.) You would get similar output as these from the UNIX “netstat -s -p icmp” or “netstat -r” commands, but additional information would be provided.

**Table 302: Sample ICMP Statistics From Windows *netstat* Utility**
D:\aa>netstat -s -p icmp ICMPv4 Statistics Received Sent Messages 243 248 Errors 0 0 Destination Unreachable 9 4 Time Exceeded 7 0 Parameter Problems 0 0 Source Quenches 0 0 Redirects 0 0 Echos 224 20 Echo Replies 3 224 Timestamps 0 0 Timestamp Replies 0 0 Address Masks 0 0 Address Mask Replies 0 0

**Table 303: Sample Routing Table Display From Windows *netstat* Utility**
D:\aa>netstat -r Route Table ================================================================= Interface List 0x1 ........................... MS TCP Loopback interface 0x2 ...00 04 76 4e 75 3f ...... 3Com 10/100 Mini PCI Ethernet ================================================================= ================================================================= Active Routes: Network Dest Netmask Gateway Interface Met 0.0.0.0 0.0.0.0 148.64.128.1 148.64.133.73 30 127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1 148.64.128.0 255.255.192.0 148.64.133.73 148.64.133.73 30 148.64.133.73 255.255.255.255 127.0.0.1 127.0.0.1 30 148.64.255.255 255.255.255.255 148.64.133.73 148.64.133.73 30 224.0.0.0 240.0.0.0 148.64.133.73 148.64.133.73 30 255.255.255.255 255.255.255.255 148.64.133.73 148.64.133.73 1 Default Gateway: 148.64.128.1 ================================================================= Persistent Routes: None

Key Concept: TCP/IP implementations include the netstat utility to allow information about network status to be displayed. On UNIX systems, netstat is a full-featured program with many options arranged into option groups, each of which shows a particular type of information about the operation of TCP/IP protocols. On Windows systems, netstat is somewhat more limited in function but still allows a considerable amount of information to be displayed.

TCP/IP DNS Registry Database Lookup Utility (whois/nicname)

TCP/IP Configuration Utilities (ipconfig, winipcfg and ifconfig)

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Version 3.0 - Version Date: September 20, 2005

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