This bit of info should provide the answers as to why your getting what you are.simply doing registry modifications isn't going to solve the root problem, imho. It flags sections.we need to know what the following flags are set to:
If you see a Router Advertisement packet, select it in the pkts section (top window), then in the packet details window (middle window) expand the icmpv6 section, then expand the flags section, then expand the prefix information options section, then expand I would capture for at least 20min, or until you see both types of pkts. We are looking to see: 1) is there an IPv6 router sending Router Advertisements, and 2) is there a DHCPv6 server replying to potential queries from the node. So now do this, install Wireshark on that computer, run it, capture packets on the Ethernet interface, in the display filter section, set a filter as follows: dhcpv6 or icmpv6.type = 134, then select the right-facing arrow on the Looks to me like that DNS entry comes from a DHCPv6 server. Filter broadcast traffic(arp or icmp or dns) Filter IP address and port.
The following in netsh, but without success: netsh interface ipv6>show interfaceġ 50 4294967295 connected Loopback Pseudo-Interface disconnected isatap.Īdresstyp DAD-Status Gültigkeit Bevorzugt AdresseĪndere Verworfen infinite infinite fe80::5efe:192.168.15.5%13Īndere Bevorzugt infinite infinite fe80::6d2d:e1db:c68:b1bc%12Īndere Verworfen infinite infinite fe80::100:7f:fffe%11
However, ipconfig /all shows an unreachable ipv6 DNS server, and promptly DNS requests start to fail. All have static ipv4 configuration and dynamic ipv6 configuration. Case of the Windows 11 SystemSettings.A customer runs a bunch of 2008 R2 Hyper-V VMs.Adding A Pause Between Items in Config.NT / Config.Sys.Display Binary Numbers and Struct Data with Printf in WinDbg.Extract Access Database Password with PowerShell.The frequency of DNS queries also analysed:ĭNS query response still slow, but much less frequent. Graphs generated using WireShark’s Statistics – I/O Graph menu option.ĭNS query response time ranged from 0.1 – 2.4 seconds These were repeated several times and results were consistent. In this case we took two WireShark traces browsing a set of websites: Using Fiddler and the statistics it collects also is useful in analysing PAC performance issues Some good guidelines for PAC files are here Īlso a tool I built here PacDbg for analysing /debugging logic in PAC file However removing the PAC file resulted in vastly improved browsing performance. The affected site also suffered very poor DNS resolution performance. In this example the PAC file had 100+ IsInNet calls that resulted in very slow performance browsing. One of the most common causes of issues I’ve found is poor DNS resolution performance in conjunction with extensive DNS queries through the PAC file.
A problem I have come across repeatedly in large enterprises is poor web browsing performance due to over engineered PAC file.
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