Show The netstat Commandnetstat is a useful tool for checking your network configuration and activity. It is in fact a collection of several tools lumped together. We discuss each of its functions in the following sections. Displaying the Routing Table When you invoke netstat with the # The The second column of netstat’s output shows the gateway to which the routing entry points. If no gateway is used, an asterisk is printed instead. The third column shows the “generality” of the route, i.e., the network mask for this route. When given an IP address to find a suitable route for, the kernel steps through each of the routing table entries, taking the bitwise AND of the address and the genmask before comparing it to the target of the route. The fourth column displays the following flags that describe the route: The route uses a gateway. U The interface to be used is up. H Only a single host can be reached through the route. For example, this is the case for the loopback entry 127.0.0.1. D This route is dynamically created. It is set if the table entry has been generated by a routing daemon like gated or by an ICMP redirect message (see the section Section 2.5 in Chapter 2). M This route is set if the table entry was modified by an ICMP redirect message. ! The route is a reject route and datagrams will be dropped. The next three
columns show the MSS, Window and irtt that will be applied to TCP connections established via this route. The MSS is the Maximum Segment Size and is the size of the largest datagram the kernel will construct for transmission via this route. The Window is the maximum amount of data the system will accept in a single burst from a remote host. The acronym Finally, the last field displays the network interface that this route will use. Displaying Interface Statistics When invoked with the # The The last column shows the flags that have been set for this interface. These characters are one-character versions of the long flag names that are printed when you display the interface configuration with ifconfig: A broadcast address has been set. L This interface is a loopback device. M All packets are received (promiscuous mode). O ARP is turned off for this interface. P This is a point-to-point connection. R Interface is running. U Interface is up. Displaying Connections netstat supports a set of options to display active or passive sockets. The options Invoking netstat -ta on vlager produces this output: $ This output shows most servers simply waiting for an incoming connection. However, the fourth line shows an incoming SMTP connection from vstout, and the sixth line tells you there is an outgoing telnet connection to vbardolino.[39] Using the Which command can be used to modify routing table?You can use the route command to modify the routing table.
Can be used to modify the TCP IP routing table?Explanation: The route command is used to view and manipulate the TCP/IP routing table in Windows OS.
How do you modify a route table?Add and remove routes from a route table. In the navigation pane, choose Route tables, and select the route table.. Choose Actions, Edit routes.. To add a route, choose Add route. ... . To modify an existing route, for Destination, replace the destination CIDR block or single IP address. ... . Choose Save routes.. What is the command for routing table?To view the Data ONTAP routing table, enter one of the following commands: netstat -rn. route -s.
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