Udp and dns



  • I am using 1.2.3-RELEASE  and there are times that there are several hundred to a thousand udp states open from my ip address to both of the dns servers that I designated in system ,general setup  have searched for some time and have not been able to understand why this is happening. Also there are also only 1 to 2 users when this is happening the states are closed rather quickly but i still don't understand why there are so many open.


  • Rebel Alliance Developer Netgate

    Depending on what your workstation is doing, it could be normal. If you are running a bittorrent client and it does a DNS request for every connected peer, it would be easy to generate dozens or hundreds of DNS requests.



  • One thing I'm wondering is why it shows a udp state to BOTH name servers. The purpose of listing two dns is just in case one fails , correct?

    173.xx.xxx.xxx:10314 -> 208.67.222.222:53  MULTIPLE:SINGLE
    173.xx.xxx.xxx:10314 -> 208.67.220.220:53        MULTIPLE:SINGLE



  • @particleman:

    The purpose of listing two dns is just in case one fails , correct?

    I think I have read that a DNS client asks all the servers concurrently (presumably to get the fastest response, particularly if a server is not contactable).


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