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showing posts tagged with 'network'
by lunarg on March 16th 2015, at 14:15

I'ved noticed the Airport Configuration Utility from Apple requires "elevation" (= run as administrator) to work properly on a Windows 8/8.1.

If it still throws out an error after connecting, try disabling IPv6, then reboot.

by lunarg on March 13th 2015, at 14:32

SwitchExplorer for Brocade FC switches no longer works properly on more recent versions of Java, because of security constraints. They can, however, be relaxed so you can still access your switches.

  1. Browse for the installation location for your JRE, and look for the folder lib/security (note: differentiate between 32 and 64-bit on Windows).
  2. Open the file java.security, and look for the line:
  3. jdk.certpath.disabledAlgorithms=MD2, RSA keySize < 1024
  4. Change the 1024 to 256, and save.

Note for Windows Vista and up: open the file elevated, or you won't be able to save it.

by lunarg on February 17th 2015, at 12:45

Using EMS (Exchange Management Shell), you can quickly retrieve a list of mailboxes not using the default quotas:

Get-Mailbox | Where { $_.UseDatabaseQuotaDefaults -eq $False } | Select Name,UseDatabaseQuotaDefaults,ProhibitSendQuota
by lunarg on February 5th 2015, at 10:38

For my own reference, the port and LED layout of a Belgacom/Proximus B-Box 2 wireless router:

LEDs

Ports

by lunarg on January 19th 2015, at 09:01

There are two online training resources available for Aerohive:

by lunarg on December 10th 2014, at 13:16

Found this online blacklist lookup tool. It checks even more lists than the one at mxtoolbox.com:

http://multirbl.valli.org/lookup/

by lunarg on September 4th 2014, at 11:52

To generate an SPF-record for your domain with the proper syntax, you can use the wizard at:

http://www.spfwizard.net/

To verify an SPF-record after it's in place:

http://mxtoolbox.com/spf.aspx

Read more on SPF: http://www.openspf.org/

by lunarg on June 25th 2014, at 14:10

A very interesting read about Wi-Fi implementations and its pitfalls in larger deployments, in particular about the usage of channels and the importance of channel plans.

http://blogs.aerohive.com/blog/the-wireless-lan-training-blog/wifi-back-to-basics-24-ghz-channel-planning

by lunarg on June 25th 2014, at 11:55
There are plenty of tools available, free and otherwise, to provide access to SFTP and SCP servers, with more or less features. Unfortunately, there aren't a whole lot of extensions out there that properly support SFTP/SCP through Windows Explorer itself, providing a somewhat seamless integration in Windows itself. Although there is the win-sshfs project, but this requires installation of several additional prerequisited software components, making this a less attractive solution. Luckily, there's also Swish.

Swish provides SFTP access from inside Windows Explorer. As it installs as an extension, it has no additional requirements, nor does it need to install some driver or library to work.   ...
by lunarg on June 18th 2014, at 13:50
Configuring NTP for time synchronization on Dell PowerConnect switches is similar to that of Cisco iOS, but with the syntax being a little different.

You need privileged console/SSH/telnet access for this to work.

SW#configureSW(config)#sntp unicast client enableSW(config)#sntp server ip-addressSW(config)#no sntp authenticateSW(config)#end

This will set the NTP server's address to whatever you specify (replace ip-address). To verify, you can run these:

show sntp configuration

This will show you the current NTP settings and status:

SW# show sntp configuration

Time zone configuration was missing for a long time, and was only introduced in more recent firmwares. Check on the Dell website  ...
by lunarg on June 18th 2014, at 13:49
From a logging point of view, it's interesting to have your clock set up correctly on your Cisco switches. Your switch should have these capabilities, but network admins usually "forget" to set these up.

To configure these, you need to have privileged access to your switch using SSH/telnet/console. The following works on any device running iOS (i.e. switches and routers).

Time zones are expressed as a name, followed by an offset. The offset indicates the number of hours from UTC, expressed as -hour or +hour. To know the offset for your time zone, you could look at the World Time Zone map.

In my case, for Central European Time, I would set it to this:

SW(config)# clock t  ...
by lunarg on June 18th 2014, at 11:53

The quick and dirty way to set up an NTP server on Debian Linux for your network.

This has been tested using Debian 7.0 "Wheezy".

1. Install NTP server:

apt-get install ntp

2. Edit /etc/ntp.conf: add the networks that are allowed to sync with your time server like so (Adjust parameters accordingly.):

restrict 192.168.0.0 mask 255.255.255.0 nomodify notrap

3. Restart the NTP service:

/etc/init.d/ntp restart

4. Set your device/computer/server to use your NTP server

by lunarg on June 10th 2014, at 16:56
Applications that reside on the network (e.g. \\server\dir\app.exe) usually can't be pinned on the taskbar in Windows 7, due to restriction posed on you by Microsoft. The options for pinning just are not present, even when you first create a shortcut to the app.

A simple solution is to fool Windows 7 that the app resides locally. In short, this is done by pinning a local app (say, Calculator), then changing that shortcut to point to your network app.

Pin any local app to the taskbar (e.g. Calculator).

Navigate to %userprofile%\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar. You'll find a shortcut to the app you just pinned.

Change the properties of the pinne  ...
by lunarg on March 24th 2014, at 14:00
You can easily set up your proxy settings for Windows Update and other background processes by using the commandline utility netsh.

Show the current settings:

netsh winhttp show proxy

Set up a basic proxy server:

netsh winhttp set proxy ip-or-host:port

Set up a proxy with a bypass list: "ip-or-domain" will not use the proxy:

netsh winhttp set proxy myproxy:80 ";ip-or-domain"

Set up individual proxy servers for each protocol accept for those in the bypass list:

netsh winhttp set proxy proxy -server= "http=ip-or-host:80 ;https=ip-or-host:88" bypass-list= "*.contoso.com"

To import the settings from Internet Explorer:

netsh winhttp import proxy source=ie

To clear and reset t  ...
by lunarg on February 11th 2014, at 13:52

To get this card running on Windows Server 2012 and 2012 R2, you need this driver:

https://downloadcenter.intel.com/confirm.aspx?httpDown=http://downloadmirror.intel.com/18720/eng/PROWinx64.exe&lang=eng&Dwnldid=18720

Newer versions no longer seem to support this card.

by lunarg on September 3rd 2013, at 10:21

You can clear the WINS cache (NBT) by using the command prompt in a similar fashion as clearing the DNS cache:

nbtstat -R

Note that this only clears the cache. Normally you would want to repopulate it by running a new discovery (reregistration) on the network, like so:

nbtstat -RR
by lunarg on May 29th 2013, at 12:36

Important for PPPoE connections on a Dell Sonicwall: with the current firmwares, the MTU is not automatically lowered to 1492 when using PPPoE as your WAN interface type. By default, it remains on 1500, so you need to manually adjust it to 1492.

This can be done by going in to the interface properties → Advanced, where you'll find a field to set the MTU.

by lunarg on April 5th 2013, at 09:08
Microsoft still does not enable NTP time sync by default on their servers. You can very easily manually enable it using the Windows Time Service, which supports time synchronisation from an NTP time server.

Open up an elevated command prompt on your server to begin.

To specify one or more NTP time servers:

w32tm /config /syncfromflags:MANUAL /manualpeerlist:0.europe.pool.ntp.org

Time sync does not automatically start, so you have to restart Windows Time Service:

net stop w32timenet start w32time

To query the status of the time sync:

w32tm /query /peers

You should get some output like this:

#Peers: 1Peer: 0.europe.pool.ntp.orgState: ActiveTime Remaining: 57.2511002sMode: 1 (Symmetric  ...
showing posts tagged with 'network'
 
 
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