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https://learn.microsoft.com/en-us/answers/questions/1432516/pc-is-connecting-to-several-multicast-dns-ip-addre
Submission: On March 29 via manual (March 29th 2024, 2:14:54 pm UTC) from US — Scanned from US

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PC IS CONNECTING TO SEVERAL MULTICAST DNS IP ADDRESSES

Lita Teng 41 Reputation points
Nov 20, 2023, 12:53 PM

My PC has continuous connections to multicast IPs:

The mdns.mcast.net translates to 224.0.0.251

I expect an intermittent connection to a multicast IP but not a constant
connection to 2 of them. Can anyone tell me if this is this normal behaviour?



Windows 10
Windows 10
A Microsoft operating system that runs on personal computers and tablets.
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1 ANSWER

Sort by: Most helpful
Most helpful Newest Oldest
 1. S.Sengupta 14,346 Reputation points • MVP
    Nov 20, 2023, 1:11 PM
    
    Your PC having continuous connections to multicast IPs is not an unusual
    occurrence.
    
    The IP address 224.0.0.251 is a mDNS address that is used to send DNS
    queries to a group of hosts on a network. The mDNS protocol is used to
    resolve hostnames to IP addresses within small networks that do not include
    a local name server.
    
    It is a normal behavior and is not a cause for concern.
    
    Please sign in to rate this answer.
    
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--------------------------------------------------------------------------------


ADDITIONAL RESOURCES

--------------------------------------------------------------------------------

Documentation

   

 * DNS requests appear to be random after startup or after network properties
   change - Windows Client
   
   In certain circumstances, DNS client may send DNS name resolution requests
   that appear to be random

   

 * Multiple default gateways cause connectivity problems - Windows Server
   
   Describes the connectivity issues that occur when multiple default gateways
   are used in TCP/IP configuration options.

   

 * Multipoint and Multicast Semantics - Win32 apps
   
   In considering how to support multipoint and multicast semantics in Windows
   Sockets 2 (Winsock), a number of existing and proposed schemes (including
   IP-multicast, ATM point-to-multipoint connection, ST-II, T.120, H.320-MCU)
   were examined.

   

 * Multicast - Win32 apps
   
   Generic Winsock multipoint functions support IP multicast.

   

 * Multicast Programming - Win32 apps
   
   Multicast programming is enabled through Windows Sockets.

   

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ADDITIONAL RESOURCES




--------------------------------------------------------------------------------

Documentation

   

 * DNS requests appear to be random after startup or after network properties
   change - Windows Client
   
   In certain circumstances, DNS client may send DNS name resolution requests
   that appear to be random

   

 * Multiple default gateways cause connectivity problems - Windows Server
   
   Describes the connectivity issues that occur when multiple default gateways
   are used in TCP/IP configuration options.

   

 * Multipoint and Multicast Semantics - Win32 apps
   
   In considering how to support multipoint and multicast semantics in Windows
   Sockets 2 (Winsock), a number of existing and proposed schemes (including
   IP-multicast, ATM point-to-multipoint connection, ST-II, T.120, H.320-MCU)
   were examined.

   

 * Multicast - Win32 apps
   
   Generic Winsock multipoint functions support IP multicast.

   

 * Multicast Programming - Win32 apps
   
   Multicast programming is enabled through Windows Sockets.

   

Show 2 more
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