- #CAN YOU USE MULTIPLE DNS SERVERS MAC PC#
- #CAN YOU USE MULTIPLE DNS SERVERS MAC MAC#
- #CAN YOU USE MULTIPLE DNS SERVERS MAC WINDOWS#
Simply enter the IPConfig command, followed by the /FlushDNS switch. If you happen to see something in the DNS resolver cache that should not be there, you can use the IPConfig command to purge the cache. You can see a partial output shown in the screenshot below. To do so, just enter the IPConfig command, followed by the /DisplayDNS switch. You can use the IPConfig command to display the contents of the DNS resolver cache. For example, the DNS cache may be modified so that the IP address that is associated with a popular search engine is replaced with the address of a malicious website.
#CAN YOU USE MULTIPLE DNS SERVERS MAC PC#
Similarly, malware authors have been known to perform DNS-poisoning attacks in which invalid DNS entries are inserted into the DNS resolver cache in an effort to either block access to a resource, or to redirect the PC to a malicious resource. If the resource is modified before the cache entry expires, then the device may be unable to locate that resource.
#CAN YOU USE MULTIPLE DNS SERVERS MAC WINDOWS#
When a Windows device uses a DNS server to resolve a domain name, the name resolution is added to an internal cache. However, the IPConfig command can help with DNS troubleshooting in other ways. I have seen situations, for example, in which a server was accidentally configured to use an external DNS server rather than an internal DNS server, and that prevented the server from being able to resolve the names of the other hosts on the internal network. As previously mentioned, using the IPConfig command with the /All switch will show you the IP address of the DNS server that the computer is currently using. One of the best use cases for the IPConfig command is that of troubleshooting DNS problems. If you want to find out which DNS server the computer is using, you will have to use the /all switch.
(If the computer is set to use multiple DNS servers, they will all be listed.) As strange as it sounds, using the IPConfig command without the /all switch displays basic IP configuration information, but the DNS server configuration is not among the information that is listed. One other bit of information that the IPConfig /all command provides that tends to be really useful is the IP address of the DNS server that the computer is configured to use.
Naturally, this type of information can be super useful when it comes to troubleshooting problems related to IP address leasing. The utility gives you information such as whether the computer is configured to use a DHCP server, the IP address of the DHCP server that leased the current IP address to the computer, when the DHCP lease was obtained, and when the lease expires. The IPConfig /all command also provides information about the computer’s DHCP usage. This can be helpful if you are trying to troubleshoot a problem on a system that has multiple network interfaces.
#CAN YOU USE MULTIPLE DNS SERVERS MAC MAC#
I won’t bore you with a comprehensive list of all the pieces of information that are displayed by the IPConfig /All command, but there are a few that I want to mention because they can be very helpful.įor starters, the IPConfig /all command lists the MAC address for each of the computer’s network adapters. All you have to do is append the /All switch to the IPConfig command. While this type of information is no doubt handy to have, the IPConfig command can display much more detailed information about the computer’s IP address configuration. Newer Windows operating systems display both the IPv4 and the IPv6 configuration. Entering the IPConfig command into the command prompt window causes information such as the system’s IP address, subnet mask, and default gateway to be displayed. Its primary use is displaying a computer’s IP address information.
One such command that I find myself using on a regular basis is IPConfig.Īs its name implies, IPConfig is an IP address configuration utility. In spite of such utilities remaining a part of the operating system for decades, many are still useful. Many of these utilities are holdovers from the days of DOS or perhaps Windows 3.x. The Windows operating system contains a huge collection of built-in command-line utilities.
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