Category: LAN Networking

A Unique Private IPv6 Subnet for Your LAN
article #263, updated 2188 days ago

IPv4 has the 192.168.*.*, 172.16-31.*, and 10.*.*.* ranges; IPv6 has one range that is enormously bigger than all of those three put together, which can contain 1,329,227,995,784,915,872,903,807,060,280,344,573 devices. The standard is to use a subnet randomly chosen, to minimize conflict when creating VPNs et cetera. The best tool I know for IPv6 subnet generation, is here:

http://v6.ponderworthy.com

You will need to tell Windows the size of your subnet. The default size is 64 on Windows, but this is quite enormous; a size of 16 is more than sufficient for a current LAN. Here is Windows configured for a IPv6 static with a 16-bit subnet, without v6 DNS as of yet:

Enjoy!

Categories:   LAN Networking   Internet Networking

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NAS reviews
article #194, updated 2376 days ago

A very good place to get info on NASes:

http://www.smallnetbuilder.com/nas/nas-reviews

Categories:   Hardware   LAN Networking

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Add IPv6 Reverse DNS to Server 2008
article #193, updated 2376 days ago

In Server 2008, the default protocol is IPv6.  It is not recommended to disable it in any way.

Default DNS, internal and LAN-wide, is therefore also IPv6.  All you really need is an AAAA record for the forward lookup.  But in many cases reverse lookup will have been skipped at server setup, and in such a case, it can get confusing to try to set up reverse DNS.  Reverse DNS is definitely recommended, it will smoothen out the LAN in general.

It has been very difficult to find any instructions to set up reverse IPv6 DNS on Server 2008.  Howsomever, here is one.

http://www.thirdtier.net/2009/08/adding-ipv6-to-dns/

Categories:   DNS   LAN Networking

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Windows 7 in an Older-Style Workgroup
article #161, updated 2454 days ago

If you have an older-style workgroup, XP and before, Windows 7 can cooperate.  Here are steps:

http://www.howtogeek.com/howto/windows-7/share-files-and-printers-between-windows-7-and-xp/


Provided by the excellent Rich McDaniel.

Categories:   LAN Networking   

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JEB's NIC Checklist
article #143, updated 2516 days ago

JEB’s Network Interface Checklist
version 2.4, 2/3/2011

  1. Any changes to NIC configuration may cause the network interface to cease connecting for a little while.  If it’s a server, this counts as “server down” for at least a few minutes.  Occasionally, if a driver is old or the machine has not been rebooted in a long time, a reboot may be necessary for the NIC to work again after certain changes are made.  It is generally best to not make changes unless there are performance issues or specific concerns about network behavior — but without these changes, overall performance often goes down more than 50%.
  2. Install the most current drivers.  If the NIC is Intel or Broadcom, install the driver downloaded from Intel or Broadcom, not from Dell or other third-party packager.  Often a third-party packager will have separated the application (e.g., “Intel PROset Application”) from the driver (“Intel PROset Driver”); in such a case, the application needs to be removed before the update installation begins.  For Intel drivers, the fastest route for the download is to go to http://downloadcenter.intel.com, search for “prowin32”, and click the link with the latest version (15.1.1 at this writing).  The link will take you to a page with both 32-bit and 64-bit drivers.
  3. For Server 2000, Server 2003, and XP, turn all offloading off.  This is actually a requirement, not just a recommendation, discussed in certain Microsoft reference materials.  In one case in the recent past, SBS simply failed to serve file or print to any workstation, unless this was done; in all cases thus far there has been an increase in general network reliability and performance when this is done.  On Intel NICs, this is often under “Performance Options”.
  4. For Server 2008, Server 2008R2, Vista, and Windows 7, turn all offloading on.
  5. For anything including “Scaling”, set it to “off” or “Disabled”, for 2000, XP, or Server 2003.  This is another Microsoft essential. There is a pack which is included in 2003SP2 which is said to make “Scaling” help, but it does not always help.
  6. For flow control, “Respond Only” (or “Rx Enabled”) is preferred, but if this is not available, set it to “On”.  This is not the same as “Rx Enabled” or “TX Enabled” under offloading!
  7. For Receive Descriptors and Transmit Descriptors on most NICs, set them to the maximum, unless the server is desperately low on RAM.  For some the maximums are 2048, for some one or the other is 5000, for others it is much less.  Each descriptor takes 2K of RAM.  Some Broadcom gigabit NICs will yellow-flag if they are set to 2048; for these, set receive to 750, transmit to 1500.
  8. For Adaptive Inter-frame Spacing, set it to “on” or “Enabled”.
  9. In the NIC’s “Power Management” tab, turn everything off.  This may have to be modified if Wake-On-LAN is used.
  10. In Server 2008, only one NIC (or one NIC team) is permitted to represent the server on the network. If there are two active NICs, you will have to turn one off, or crashes and unpredictable behavior will result sooner or later.
  11. In Server 2008, IPv6 must be turned on, and not deleted. It does not have to be configured, but it must be turned on.
  12. It is very much preferable, for Server 2008 and most especially for SBS 2008, for a working IPv6 subnet to be configured, even if the server(s) are the only devices which are able to use IPv6.

Categories:   Network Hardware & Drivers   LAN Networking

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Out of memory/space issues, Server 2003/2008 and domain workstations
article #141, updated 2517 days ago

When workstations on a Server 2003 domain, report an insufficient memory and/or disk space profile error at login, try this:

http://support.microsoft.com/kb/935649

It also appears to help general memory usage issues.  The same settings are listed by Microsoft in Server 2008 for an antivirus issue:

http://support.microsoft.com/kb/973366

This one is from the indefatigable Liz Landry.

Categories:   Cleanup   LAN Networking

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Windows was unable to find a certificate to log you on to the network (wireless)
article #134, updated 2545 days ago

How to fix this problem?  Try this:

http://helpdeskgeek.com/how-to/windows-was-unable-to-find-a-certificate-to-log-you-on-to-the-network/

Categories:   LAN Networking   Network Hardware & Drivers

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Teaming NICs, Broadcom especially
article #130, updated 2569 days ago

If you have a Broadcom NIC listed for use with “Broadcom Advanced Control Suite 3”, you can team both Broadcom and Intel NICs.  Only catch:  you will need one static IP on your LAN for each.

Categories:   LAN Networking   Network Hardware & Drivers

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Private IPv6 Address Range Generator
article #125, updated 2579 days ago

Here is an automatic generator of IPv6 private address ranges:

http://www.simpledns.com/private-ipv6.aspx

Categories:   Internet Networking   LAN Networking

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Enable Remote Desktop (RDP) Remotely
article #118, updated 2626 days ago

As long as you have an administrative password for the domain, this works:

http://www.howtonetworking.com/RemoteAccess/enablerdc1.htm

Categories:   Internet Networking   LAN Networking