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1.10 Verify IP parameters for Client OS (Windows & Linux)

Verifying IP Configuration on Windows

To identify what IP configuration is set on a Windows PC, the simplest method is to use the command "ipconfig /all" within Command Prompt or PowerShell. We specify the "/all" flag to ensure that all network devices attached to the PC are displayed in the output.

Let's explore some of the details shown in the above screenshot.

There are lots of commands available to run on a Windows PC to confirm how the NIC is configured, such as:

 

  • ping | used to test reachability to another IP address either inside or outside the local subnet

  • tracert | used to check the path that packets take across a network, also useful for identifying latency at certain hops

  • netstat -rn | displays the PC's routing table

  • netstat | lists the current TCP/UDP sessions created by the PC with source and destination ports and IP addresses

  • netsh interface ipv6 show | lists some of the available commands to confirm IPv6 configuration (such as multicast groups etc)

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Verifying IP Configuration on Linux

As with Windows there are specific commands to run on different operating systems. For Linux we can use the commands "ip address" or "ifconfig". To show the default gateway we need to run the "ip route" command. See below:

 

networkingbasicsvm2@networkingbasicsvm2:~$ ifconfig

enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

        inet 10.0.2.15  netmask 255.255.255.0  broadcast 10.0.2.255

      ether 08:00:27:d9:0d:5b  txqueuelen 1000  (Ethernet)

        RX packets 232  bytes 223788 (223.7 KB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 237  bytes 23817 (23.8 KB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536

        inet 127.0.0.1  netmask 255.0.0.0

        inet6 ::1  prefixlen 128  scopeid 0x10<host>

        loop  txqueuelen 1000  (Local Loopback)

        RX packets 83  bytes 8465 (8.4 KB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 83  bytes 8465 (8.4 KB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

 

networkingbasicsvm2@networkingbasicsvm2:~$ ip address

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scope host lo

      valid_lft forever preferred_lft forever

    inet6 ::1/128 scope host

      valid_lft forever preferred_lft forever

2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000

  link/ether 08:00:27:d9:0d:5b brd ff:ff:ff:ff:ff:ff

  inet 10.0.2.15/24 brd 10.0.2.255 scope global dynamic noprefixroute enp0s3

      valid_lft 86334sec preferred_lft 86334sec

 

networkingbasicsvm2@networkingbasicsvm2:~$ ip route

default via 10.0.2.2 dev enp0s3 proto dhcp metric 100

10.0.2.0/24 dev enp0s3 proto kernel scope link src 10.0.2.15 metric 100

169.254.0.0/16 dev enp0s3 scope link metric 1000

 

Please see a below list of useful commands for network configuration checks on Linux:

 

  • ping | used to test reachability to another IP address either inside or outside the local subnet

  • traceroute | used to check the path that packets take across a network, also useful for identifying latency at certain hops (may need to be installed via apt)

  • ip route | displays the PC's routing table

  • netstat | lists the current TCP/UDP sessions created by the PC with source and destination ports and IP addresses

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