Windows cmd ping sweep

Instead of installing a third party application which has the possibility to have spyware or other bad stuff in it. If you only need to do a ping sweep with no additional features it's probably easier just to do it in CMD.

1. Open up cmd
2. Run the following
for /L %z in (1,1,254) do @ping 10.0.0.%z -w 10 -n 1 | find "Reply"

Where:

• (1,1,254) indicates to test every address from 1-254
• 10.0.0. is the network address prefix of addresses you want to test
• %z is filled in with numbers from (1,1,254)
• -w 10 - only waits 10ms before moving on
• -n 1 - only tries once before moving on
• find "Reply" looks for a succesful ping result and ignores unsuccessful

Scheduling Internet Speed Tests on Synology

SSH into the synology device

Download the following script to whichever directory you like

wget https://raw.githubusercontent.com/sivel/speedtest-cli/master/speedtest.py


Allow execute permissions

chmod +x


Create a scheduled task via "Task Scheduler" section in control panel
Run Command should look similar to the following

/bin/python /path_to_script/speedtest.py


For some reason the output doesn't appear in the task scheduler window when the full output is displayed

However, the results are appearing properly in the email notification and when I reduce the amount of output by modifying the script a bit it displays properly as well
python speedtest.py --no-download --simple

You can automatically log the output of any script to a file as well in Task Scheduler.
This can be done by going to the Task Scheduler app, Settings, enabling output recording, and specifying a directory to store output.


References:
https://forum.synology.com/enu/viewtopic.php?t=130824
https://www.reddit.com/r/synology/comments/76wxd8/speedtestcli_on_diskstation/

Find RAM Population Details

To find out which memory modules have been installed in your machine in Windows

C:\WINDOWS\system32>wmic memorychip list full


BankLabel=
Capacity=8589934592
DataWidth=64
Description=Physical Memory
DeviceLocator=DIMM A
FormFactor=12
HotSwappable=
InstallDate=
InterleaveDataDepth=1
InterleavePosition=1
Manufacturer=Kingston
MemoryType=24
Model=
Name=Physical Memory
OtherIdentifyingInfo=
PartNumber=KN2M64-ETB
PositionInRow=1
PoweredOn=
Removable=
Replaceable=
SerialNumber=BAEEB1AF
SKU=
Speed=1600
Status=
Tag=Physical Memory 0
TotalWidth=64
TypeDetail=128
Version=


MacOSX
http://www.alphr.com/features/391525/how-to-find-ram-speed-size-and-type

References:
https://superuser.com/questions/606318/how-to-find-the-ram-type-in-command-prompt
https://winaero.com/blog/how-to-see-ddr-memory-type-in-command-prompt-in-windows-10/
https://winaero.com/blog/quickly-find-what-ddr-memory-type-you-have-in-windows-10/
https://www.howtogeek.com/175434/how-can-i-check-my-computers-ram-configuration-without-opening-the-case/

Places to Play PickleBall in Kitchener Waterloo

The two most popular places I've seen are KW-Badminton Club & RIM Park

KW-Badminton Club
Website: http://www.kwbadminton.com/pickleball2/
Rackets: You can borrow for free
Price: $5 (or bulk purchase discount)
Location: 69 Agnes Street, Kitchener

RIM Park
Website: http://www.waterloo.ca/en/gettingactive/pickleball-drop-in.asp
Rackets: Borrow for free 3 times
Price: $5 (bulk/age discount)
Location: RIM Park 2001 University Ave. E

Other Places to Play
Website: http://kwpickleball.weebly.com/places-to-play.html
Alternative: Various YMCA's have pickleball in their schedule (ex. check out A.R. Kaufman Family YMCA)

Where to Buy Rackets:
Website: http://courtsplus.ca/
Location: 55 Erb Street East, Waterloo, ON
Price: Minimum ~$80

F5 Load Balancing

What is a Load Balancer

Beyond making routing decisions a load balancer inspects application traffic rather than just routing information to make forwarding decisions.
Will look at the connection loads of all nodes behind and make an educated choice as to where to forward the packet

Features

Intercept and redirect incoming traffic
ex. redirect www.domain.com to https://www.domain.com/test

Provides SSL certification-based authentication and termination
Has an SSL module installed to encrypt and re-encrypt traffic.
This allows some migration of load from the web servers performing the encryption to the F5 load balancer.

Inspect application data and make routing decisions based off of iRules.
Example: You can make it so that all iPad users are redirected to a specific site.

Has packet filters which are similar to access control lists

What is load balancing

When you have multiple network servers as resources responding to client requests made to a virtual IP.

Structure

VIP - Primary IP Address for the site
 POOL - Pool is a VIPs resource and has a load balancing algorithm applied
  MEMBER1
  MEMBER2
  MEMBER3

Health checks are applied to pool members to ensure the pool members are in a safe state to redirect traffic to them.

Local Traffic Objects

Network Map - Shows how the VIPs are tied to pools and resources
Virtual Servers - Where all your configuration for your VIPs are stored 
 Profiles - If you want to configure persistence or SSL termination
 iRules - To configure manipulation of application data or payload requests traveling through the LTM
 Pools - The resources for VIPs to group members together
 Nodes - Are the IP addresses of the servers you are going to use
Monitors - Health Checks of Big IP LTM used to determine if a host is in a healthy state
Traffic Class - Allow you to classify traffic based off multitude of criteria 
Address Translation - Allows you to connect to devices not in the same IP space using SNAT

Connection Table

Used to store and manage all of its connections

Two different types of connections: Client Side and Server Side
Client side is external to the Big IP (also referred to the front side or internet facing side or connection initiating side)
Server side is internal

Every connection uses resources and inactive connection purging happens to save system resources

iRules

Allows manipulation of server side and client traffic all the way up to the application layer
Parses through the client server headers and looking at payload data to make decisions

A main use of iRules is to perform a redirect whether its a plain URL redirect redirecting one site to another or performing an HTTP to HTTPS redirect.

Event Declaration - Defines the state the connection is currently in
Tcl Code - is executed when the event is matched

SSL Termination

Not only does it relieve some performance of the web servers it also gives the load balancer the ability to see the actual traffic and make routing decisions
SSL Cert and Key are required to terminate SSL connections - added to the load balancer in the form of a profile
Occasionally if policy does not allow server side data to be decrypted the F5 has the ability to re-encrypt data after decryption and inspection

Basic Group Policy Configuration

Group Policy is typically applied to Organizational Units.
Organizational Units have a book icon under "Active Directory Users and Computers"

It is a good idea to separate your Organizational Units into:

• Computer Policy
• User Policy

You place user accounts under the Users OU and Computers in the Computer OU

Creating OU's is done by creating and managing users.

You would go to "active directory users and computers" then right click on the domain and click "create ou"

To manage group policy you go:
Start > Administrative Tools > Group Policy Management
You then drill down the forest to the specific domain you're looking for.

Once you find the OU you're looking for you just right click it and press "Create a GPO in this domain, and Link it here"

You then just give it a name and you'll find it under the OU

To configure the group policy you just created:

1. Expand the OU you created the Policy for
2. Find the policy you created, right click it, press "Edit"

Computer Configuration - Is applied to the machine when the computer starts up
User Configuration - Is applied when the user logs in
Policies - Are strictly enforced and the users cannot change the preferences specified
Preferences - Are not strictly enforced and the user can change what is specified

All you do then is expand the policies until you find a policy you would like to modify. Once you find it you will have to enable the policy.


References:
https://www.youtube.com/watch?v=b253bUxZ270
https://www.youtube.com/watch?v=J_bQ4IIp3l8

Setting IP Address with Network Manager

It seems like most network configuration is now being supported and focused on through network manager.

With that being said it is useful to know how to setup connections using the network manager cli "nmcli"

Delete a Conneciton

First find the connection you want to delete
nmcli con show

[root@beta-spc ~]# nmcli con show
NAME UUID TYPE DEVICE
eno2 b92a64bd-d6d4-4df4-bb76-bb3d79906ca6 802-3-ethernet --
eno4 de8b37ac-dfbd-4bae-8b16-10ec27f3f8f2 802-3-ethernet --
eno3 d25d0375-742f-4ad0-9510-7f86c3d5c619 802-3-ethernet --
net-eno1 b2eab8d8-c13b-4822-a202-9892c8676a3b 802-3-ethernet eno1

Then lets delete "net-eno1" so we can add new info for it

nmcli con del b2eab8d8-c13b-4822-a202-9892c8676a3b


Add a new connection

nmcli con add ifname eno1 type ethernet ip4 192.168.249.7/24 gw4 192.168.249.1


Resources:
https://www.certdepot.net/rhel7-configure-ipv4-addresses/

Collaborative Playlists

This tutorial describes how to create a playlist that can be shared and collaborated on among youtube users.

1. Login to youtube.com

2. Search a video you would like to add to your playlist

3. Click the video you would like to add to the playlist

4. Click the "Add to" button below the video

5. Click "Create new playlist" button that comes up

6. Type a name for the playlist you would like to create and then select "Create"

7. In the top left of the screen locate the drop-down menu and click it

8. Find the playlist you just created and click it

9. Go to "Playlist Settings"

10. Click on the "Collaborate" tab

11. Flip the switch that says "Collaborators can add videos to this playlist"

12. Click the "Get link" button

13. Copy the link and save it somewhere as you will need it to share with all members who you would like to be able to add videos to your playlist

14. Select the "Save" button

When users open the link you have shared with them it will display the playlist.

They will be able to add videos using the "Add videos" button located on the top right of the playlist


Resources and other playlist sharing options:
http://techpp.com/2013/01/23/create-share-music-playlists/
http://lifehacker.com/five-best-ways-to-share-playlists-1720065800
https://support.google.com/youtube/answer/6109639?hl=en
http://www.youtubeplaylist.org/
https://m.youtube.com/watch?v=EgjDdhAWBrg
http://www.makeuseof.com/tag/b00mbox-create-youtube-playlists-friends/

Add and Replce Lines Using Sed

Insert a line after the matched string

sed '/$match/ a "$new_line"' $filename


Insert a line before the matched string

sed '/$match/ i "$new_line"' $filename


Replace Matching Line

sed '/$match/ c "$replacement_line"' $filename


References:
http://arkit.co.in/linux/sed-command-20-practical-examples/
http://www.grymoire.com/Unix/Sed.html

Apache Log Analysis

The below will install and configure GoAccess
GoAccess is an httpd-access log parser that will give you page hit statistics and other useful analytic tools.

Equipment

GoAccess OS: RHEL 7.0
Server OS: FreeBSD 5.4 STABLE
Server Application: Apache/1.3.34 (Unix)

Prerequisites

Install GoAccess

yum -y install goaccess

Ensure you have access to httpd-access.log

Either live files under: /var/log/httpd-access.log
OR
Copy the files from a live server: scp /var/log/httpd-access.log $servername:/path/

Configure GoAccess

Open up /etc/goaccess.conf and change the three parameters: time-format, date-format, and log-format to match what I have here
grep -E "log-format|time-format|date-format" /etc/goaccess.conf | grep -v "^#"
time-format %H:%M:%S
date-format %d/%b/%Y
log-format %h %l %u %^[%d:%t %^] "%r" %s %b "%R" "%u"

The original httpd.conf combined LogFormat that I have looks like

LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined

The important part in this config is to note that we do some ignoring of fields that apache adds.
We ignore the brackets before and after the timestamp:

%^[
%^]

We can see that we also:
Remove escapes \"%r\"
Change \"%{Referer}i\" to "%R"
Change \"%{User-Agent}i\" to "%u"

Analyzing Some Logs

Either ensure you are in /var/log/ or copy the files to a directory on your server.

GoAccess supports piping of log files to analyze so we can just run it like this:
bzcat httpd-access.log.* | goaccess
Alternatively, generate an html report just by redirecting output to an html file like this:
bzcat httpd-access.log.* | goaccess > report.html

http://webmasters.stackexchange.com/questions/4852/what-is-the-best-apache-logs-analyzer
https://en.wikipedia.org/wiki/List_of_web_analytics_software
http://www.debianhelp.co.uk/analog.htm
http://stackoverflow.com/questions/9234699/understanding-apache-access-log
http://xmodulo.com/interactive-apache-web-server-log-analyzer-linux.html
http://i-heart-geek.blogspot.ca/2011/10/top-command-line-tips-apache-access-log.html