Tag Archives: dns

Active Directory Dynamic DNS broken by Juniper SRX firewall ALG

Last week a Juniper SRX firewall was put in to replaceĀ an olderĀ internal firewall. This week a load of Windows Servers dropped out of Active Directory DNS. The scavenging period in AD DNS was configured to be 7 days. Coincidence? I … Continue reading

Rate this:

Posted in Networking, Windows | Tagged , , , , , , , , , , , , , , , , , , , , | Leave a comment

2012 R2 DC server rename DNS configuration

In my test environment I experimented with renaming a 2012 R2 Active Directory Domain Controller, i.e. changing its computer name. Things seemed to be mostly OK afterwards, and I found I didn’t need to fiddle with DFS-R as you had … Continue reading

Rate this:

Posted in Windows | Tagged , , , , , , , , | Leave a comment

Network Optimisation for Office 365 and other external or cloud services

These are some notes from a short video I just watched. Scanning through these notes will take less time than watching the whole 13 minute video. Plus I’ve added links and more info Latency PsPing is one of the SysInternals … Continue reading

Rate this:

Posted in Networking, Performance, Windows | Tagged , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , | 1 Comment

Get and delete DNS A and PTR records via PowerShell

My Remote Desktop Session Host build process is now pretty slick. I can easily rebuild a lot of RDSH VMs very quickly. The process basically involved powering off the existing VM, deleting both it and its Active Directory account, and … Continue reading

Rate this:

Posted in PowerShell, Scripting, Windows | Tagged , , , , , , , , , , , , | 4 Comments

PowerShell: Scan subnet for dead addresses

Quick script to scan a range of addresses on an IPv4 subnet and report ones that don’t ping, additionally doing a reverse DNS query on those IP addresses to try and get their names. I’m doing two pings, as I … Continue reading

Rate this:

Posted in PowerShell | Tagged , , , , , , , , , , , | Leave a comment

Completely disable IPv6 on Windows 7 and Server 2008 R2

You might have reason to do this, here’s how I did it (there are slight variations elsewhere online). Set the following registry value: HKLM\SYSTEM\CurrentControlSet\services\TCPIP6\Parameters\DisabledComponents = 0xFF Reboot After the reboot you can check that IPv6 is not working by issuing … Continue reading

Rate this:

Posted in Windows | Tagged , , , | 3 Comments