Monthly Archives: February 2014

Microsoft

Install .NET 3.5 on Windows 8

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We recently rolled out an image for Windows 8.1 for corporate use. Unfortunately some of the products that I use require .net 2.0+ to be installed. I remember from my Win7 days that I can simply go to Programs and Features, and then turn Windows features on or off, then select .net framework 3.5 (includes 2.0 and 3.0).

Unfortunately I was receiving the following error:

0x800f0906: “Windows couldn’t connect to the Internet to download necessary files. Make sure that you’re connected to the Internet, and click Retry to try again.”
0x800F081F: “The changes could not be completed. Please reboot your computer and try again.”

Dang. Work around (Thanks J3 and http://msdn.microsoft.com/en-us/library/hh506443(v=vs.110).aspx)

Mount the Windows Installation Image
Either pop in your windows 8.1 CD or double click on the ISO (running Windows 8+ allows you to mount ISO by double clicking, win7- needs some sort of ISO mounting kit)

Command Line Install
Open a command prompt with Admin credentials (run as admin if necessary)
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:d:\sources\sxs

Explanation Of Arguments

/Online targets the operating system you’re running (instead of an offline Windows image).
/Enable-Feature /FeatureName:NetFx3 specifies that you want to enable the .NET Framework 3.5.
/All enables all parent features of the .NET Framework 3.5.
/LimitAccess prevents DISM from contacting Windows Update.
/Source specifies the location of the files needed to restore the feature (in this example, the D:\sources\sxs directory).

Linux

Rancid and Dell Switches

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Running rancid for all of our cisco gear is pretty nice, but we’re acquiring more and more non-cisco (dell/F10) switches for our iSCSI 10Gb and 40Gb needs. Price is a major contributor to that shift.

Anyway, we needed to add Dell PowerConnect 8132 and 8132F switches to the monitor.

This is geared towards the Debian/Ubuntu install I did in an earlier post. Files are from GIT (https://github.com/dotwaffle/rancid-git/tree/master/bin)

Download the required bin files
cd /var/lib/rancid/bin
wget http://it.thelibrarie.com/utilities/dlogin
wget http://it.thelibrarie.com/utilities/drancid
chmod +x dlogin
chmod +x drancid

Edit the Rancid manufacturer file
nano rancid-fe
Under %vendortable add the Dell brand
'dell' => 'drancid',
Save and Exit

Open your router.db file
nano /var/lib/rancid/IMO/router.db

Set your switch in the database
your.dell.switch:dell:up
Save and Exit

Either run rancid or wait until your cron job kicks off
sudo -u rancid -H /usr/bin/rancid-run

****EDIT 4/2/14****
So I ran the dlogin/drancid against one of my Dell switches and was receiving the following error in my /var/log/rancid/newestfilehere:

exec failed router manufacturer dell: No such file or directory

Dang, that’s no good.

cd /var/lib/rancid/bin
./dlogin IPADDRESS_OR_NAME_OF_DEVICE

-bash: ./dlogin: @EXPECT_PATH@: bad interpreter: No such file or directory

Well that solves that issue.

nano /var/lib/rancid/bin/dlogin
Add this to the very top:
#!/usr/bin/env expect
Save and quit
./dlogin IPADDRESS_OR_NAME_OF_DEVICE

root@rancid:/var/lib/rancid/bin# ./dlogin fp-dell8132sw1
fp-dell8132sw1
spawn ssh -c 3des -x -l dellsw fp-dell8132sw1
The authenticity of host ‘fp-dell8132sw1 (10.20.209.000)’ can’t be established.
RSA key fingerprint is 0b:05:08:c1:00:e9:00:30:0d:00:00:00:00:00:00:00.
Are you sure you want to continue connecting (yes/no)?
Host fp-dell8132sw1 added to the list of known hosts.
yes
Warning: Permanently added ‘fp-dell8132sw1,10.20.209.000’ (RSA) to the list of known hosts.
dellsw@fp-dell8132sw1’s password:

FP-DELL8132SW1>enable
Password:********

Success!

And make sure you do the same to @PERLV_PATH@: bad interpreter: No such file or directory
nano /var/lib/rancid/bin/drancid
Add the following to the top of the file

#!/usr/bin/perl -w

Save and close
./drancid to verify

EDIT!!!
apparently my hosting company doesn’t like me having perl, python, or other scripts laying around in a directory with no index page. So here’s the tarball of the files:
Tarball of 3 files

Linux

BYOBU Infinite Scroll Fix

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Installed BYOBU (easier for me to use than screen) on my security-onion
(http://blog.securityonion.net/2012/02/byobu-and-security-onion.html)
apt-get install byobu

Execute byobu
byobu
F9 and set Byobu to launch automatically

Configuration (Pre-12.04 Ubuntu)
byobu-config
Toggle status notifications
Scroll down space bar to disable the logo
Tab to apply and then exit

Configuration (12.04 and later Ubuntu)
byobu-select-backend
Select Screen

Using BYOBU
Control + a = start of menu (F9 for more settings)
Control + a, c = create a new screen
Control + a + a = last screen used
Control + a, 0 = screen 0
Control + a, 3 = screen 3