Using Netflow, I could see the ip address of the offender but couldnt see the hostname of the computer/workstation that was the offender.Here is my config for DHCP on the switch -ip dhcp pool PC network 10.1.70.0 255.255.255.0 domain-name dns-server 10.1.1.1 10.1.1.2 default-router 10.1.70.1 lease 8This is an office across the street from the main building.Q: Does setting DNS dynamic update credentials on DHCP achieve the same result as adding a DHCP server to the Dns Update Proxy group?A: The short answer is no; however, it's important to step back and understand how DNS interacts with DHCP regarding dynamic updates, then look at what each of the two actions mentioned in the title actually does—namely, setting DNS dynamic update credentials on DHCP and adding a DHCP server to the Dns Update Proxy group.I just spun up a new VPS, set it up with a fresh and clean LAMP stack and pointed my domain to it.I waited a few hours and tried it and it was still my old website. At this point, I did the following: Pinging expunged [expunged] with 32 bytes of data: Reply from expunged: bytes=32 time=49ms TTL=51 Reply from expunged: bytes=32 time=49ms TTL=51 Reply from expunged: bytes=32 time=51ms TTL=51 Reply from expunged: bytes=32 time=49ms TTL=51 Ping statistics for expunged: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 49ms, Maximum = 51ms, Average = 49ms Problem Solved ----- As Ben Plont commented, the troublesome computer was on Open DNS.If you’re like many Dyn DNS customers, you have a dynamic IP address which changes periodically (monthly, weekly or even daily).This can make it difficult or impossible to connect to services at home, like remote desktop or FTP.

Unfortunately, as they are all third-party products, you’ll need to contact the manufacturer for support with the device. If your host was blocked for abuse, it probably wasn’t something that you did intentionally.You can either use the update client in your router or download a software client to run on your computer.We highly recommend using software clients since they tend to be more reliable than many of the update clients used in routers.We have multiple hosts as of late that sucessfully pull a DHCP address and are domain machines that there is no A record being created for the host.I can do a reverse lookup on the IP and that works but not name to IP.