squid 6.3: client internal ip address PTR DNS query

David Touzeau <david@xxxxxxxxxxxxxx> · Tue, 18 Mar 2025 11:25:38 +0100



    We note that Squid performs a client DNS PTR
      query each time client sends query.

      
      We have taken care to ensure that

      
      that the log model does not use machine
          names 
      No acls concerning workstation
          hostnames are added.
    
    
      We use kerberos authentication with Squid: is
      negotiate_kerberos_auth/process plugin is able to perform PTR
      requests?

      
      Is there another option that denies squid to perform such
      requests?

    
    Regards

  
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