Sockstat in Software Implement upc a in Software Sockstat

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Sockstat use software upc-a generator toinsert universal product code version a with software ISO Standards Overview The sockstat( Software UPC-A Supplement 5 1) command is a useful utility that displays the list of open sockets. Using sockstat, you can find out which processes are listening and on what sockets, or see a list of currently connected sockets. You may see a list of currently listening sockets and the process behind each socket using the -l option:.

# sockstat -l USER COMMAND mysql mysqld mysql mysqld www httpd www httpd root httpd cvsup cvsupd root sshd root sshd root syslogd root syslogd root syslogd root syslogd root devd PID 35726 35726 93848 93838 93837 95113 627 627 520 520 520 520 461 FD 10 12 20 20 20 3 3 4 4 5 6 7 4 PROTO LOCAL ADDRESS FOREIGN ADDRESS tcp4 *:3306 *:* stream /tmp/mysql.sock tcp4 *:80 *:* tcp4 *:80 *:* tcp4 *:80 *:* tcp4 *:5999 *:* tcp6 *:22 *:* tcp4 *:22 *:* dgram /var/run/log dgram /var/run/logpriv udp6 *:514 *:* udp4 *:514 *:* stream /var/run/devd.pipe [ 123 ].

Network Configuration Basics In the above example, the httpd process that is running as user www with PID 93848, is listening on the TCP port 80 and is bound to all available interfaces (note the "*:80"). You can also use the sockstat(1) utility to see a list of currently connected sockets as well:. # sockstat -c UPC-A Supplement 5 for None USER farrokhi farrokhi root root cvsup root root COMMAND sshd sshd sshd sshd cvsupd login cron PID FD 41221 3 41221 4 41219 3 41219 5 95113 6 686 3 646 5 PROTO LOCAL ADDRESS tcp4 10.0.11.

2:22 stream -> tcp4 10.0.11.

2:22 stream -> dgram -> dgram -> dgram -> FOREIGN ADDRESS 172.16.31.

9:1175 172.16.31.

9:1175 . netstat The netstat(1 UPC-A Supplement 2 for None ) utility is another all-in-one utility that displays various sorts of network related information. Using various netstat parameters, you can see the statistics of the network subsystem. The following table contains a list of netstat parameters and describes what they would display:.

Parameter No Parameters -i -s -si -m -B -r -rs Description Displays list of active network sockets per protocol Network interface statistics Protocol statistics Protocol statistics per interface Memory buffers (mbuf(9)) statistics bpf(4) interface statistics Displays routing table contents Routing statistics. Combination o Software UPC-A f different netstat parameters can be used to display very useful information that would come in handy, while troubleshooting network. One example is that, you can see the statistics of a specific the network interface from different perspectives as shown in the following command:. # netstat -i -I bge1 Name Mtu Network Opkts Oerrs Address Coll [ 124 ] Ipkts Ierrs 7 bge1 1500 Software UPC Code <Link#2> 00:16:35:80:ac:52 19972917 52791 0 0 bge1 1500 81.91.129.

64/ devbox 19755146 22207004 22219879 -. This example shows the statistics for the bge1 network interface. There are two lines of statistics, one for the layer2 protocol (Ethernet in this example) information and another for layer3 protocol (IP in this example). The first (after the header) indicates the interface name, current MTU size, Network information (which is not available in layer2), address (which is MAC address in layer2), number of Input Packets, number of Input Errors , Number of output packets, Number of output errors and finally the number of detected collisions on the interface.

The next line displays the same information (if applicable) for layer3. The information that is useful for troubleshooting is the number of packets, and more importantly, the number of errors that might be caused due to faulty hardware..

FreeBSD maint UPCA for None ains a layer2-to-layer3 address mapping database called ARP table. ARP is thoroughly explained in RFC 826. The arp(8) utility is used to manipulate the system"s ARP table.

While the system automatically takes care of updating and refreshing the ARP database, the systems administrator can manipulate (add or remove) the ARP database entries, when needed. The arp(8) utility is used to display the contents of the system"s ARP table:. # arp -an ( 172.21.0.

13) at 00:10:db:58:4d:49 on bge1 [ethernet] (172.21.0.

1) at 00:11:0a:9c:fe:c5 on bge1 [ethernet] (192.168.2.

133) at 00:02:b3:8c:9f:c2 on bge1 [ethernet]. If you want t Software UPCA o remove a specific ARP entry from the table, you may use the arp d command:.
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