Blog

Delete EFI partition on USB drive in windows

 

Press “Windows Key + R to open the run dialogue box,

Type“diskpart” and double click “Diskpart – run command” to open a command prompt window.

 

Type “list disk” > Enter

“select disk n” ( where n = disk number ) > Enter

Type “list partition” to display all the volumes on the hard drive.

Type “select partition n” ( n stands for the volume ).

Type “delete partition override” to remove the EFI partition.

Type “exit” to close the diskpart window

 

Install Windows Server Backup 2012R2

Came across issue – cant find “Server backup” via GUI – need to grab a copy of the system state file just in case.

 

Install Windows Server Backup using Powershell:

1.      The first line “get-windowsfeature *backup*” is in order to figure out the name of the backup feature to install.

2. Import Server-Manager

3. Add-WindowsFeature Windows-Server-Backup

4.      Powershell output:

 

Call “HostDatastoreSystem.QueryVmfsDatastoreCreateOptions” for object “ha-datastoresystem”

https://kb.vmware.com/s/article/1008886

Pulled drive from SAN to reuse in Dell R720 ( 6 x 450 SAS > RAID 10 )

Add to Esx host – I get the following error

 

Notice how the “Next Button is greyed out”    

SSH into ESX Host;

ls /vmfs/devices/disks/ -all

 

Confirm Disk !!!!

 

dd if=/dev/zero of=”/vmfs/devices/disks/naa.6d4ae520b64abc002255e4521958aa90” bs=512 count=34 conv=notrunc

 

 

 

 

CIDR – Network Conversion

For future reference

** note to self ** /31 is for point to point, ie wireless isp to client

Bitmask (Bits) Dotted Decimal Hexadecimal Binary
/0 0.0.0.0 0x00000000 00000000 00000000 00000000 00000000
/1 128.0.0.0 0x80000000 10000000 00000000 00000000 00000000
/2 192.0.0.0 0xc0000000 11000000 00000000 00000000 00000000
/3 224.0.0.0 0xe0000000 11100000 00000000 00000000 00000000
/4 240.0.0.0 0xf0000000 11110000 00000000 00000000 00000000
/5 248.0.0.0 0xf8000000 11111000 00000000 00000000 00000000
/6 252.0.0.0 0xfc000000 11111100 00000000 00000000 00000000
/7 254.0.0.0 0xfe000000 11111110 00000000 00000000 00000000
/8 255.0.0.0 0xff000000 11111111 00000000 00000000 00000000
/9 255.128.0.0 0xff800000 11111111 10000000 00000000 00000000
/10 255.192.0.0 0xffc00000 11111111 11000000 00000000 00000000
/11 255.224.0.0 0xffe00000 11111111 11100000 00000000 00000000
/12 255.240.0.0 0xfff00000 11111111 11110000 00000000 00000000
/13 255.248.0.0 0xfff80000 11111111 11111000 00000000 00000000
/14 255.252.0.0 0xfffc0000 11111111 11111100 00000000 00000000
/15 255.254.0.0 0xfffe0000 11111111 11111110 00000000 00000000
/16 255.255.0.0 0xffff0000 11111111 11111111 00000000 00000000
/17 255.255.128.0 0xffff8000 11111111 11111111 10000000 00000000
/18 255.255.192.0 0xffffc000 11111111 11111111 11000000 00000000
/19 255.255.224.0 0xffffe000 11111111 11111111 11100000 00000000
/20 255.255.240.0 0xfffff000 11111111 11111111 11110000 00000000
/21 255.255.248.0 0xfffff800 11111111 11111111 11111000 00000000
/22 255.255.252.0 0xfffffc00 11111111 11111111 11111100 00000000
/23 255.255.254.0 0xfffffe00 11111111 11111111 11111110 00000000
/24 255.255.255.0 0xffffff00 11111111 11111111 11111111 00000000
/25 255.255.255.128 0xffffff80 11111111 11111111 11111111 10000000
/26 255.255.255.192 0xffffffc0 11111111 11111111 11111111 11000000
/27 255.255.255.224 0xffffffe0 11111111 11111111 11111111 11100000
/28 255.255.255.240 0xfffffff0 11111111 11111111 11111111 11110000
/29 255.255.255.248 0xfffffff8 11111111 11111111 11111111 11111000
/30 255.255.255.252 0xfffffffc 11111111 11111111 11111111 11111100
/31 255.255.255.254 0xfffffffe 11111111 11111111 11111111 11111110
/32 255.255.255.255 0xffffffff 11111111 11111111 11111111 11111111

Class address ranges:

Class A = 1.0.0.0 to 126.0.0.0
Class B = 128.0.0.0 to 191.255.0.0
Class C = 192.0.1.0 to 223.255.255.0

Reserved address ranges for private (non-routed) use:

10.0.0.0 -> 10.255.255.255
172.16.0.0 -> 172.31.255.255
192.168.0.0 -> 192.168.255.255

Other reserved addresses:

127.0.0.0 is reserved for loopback and IPC on the local host
224.0.0.0 -> 239.255.255.255 is reserved for multicast addresses

Chart notes:

Number of Subnets – “( )” Refers to the number of effective subnets, since the use of subnet numbers of all 0s or all 1s is highly frowned upon and RFC non-compliant.
Number of Hosts – Refers to the number of effective hosts, excluding the network and broadcast address.

Class A
Network Bits Subnet Mask Number of Subnets Number of Hosts
/8 255.0.0.0 0 16777214
/9 255.128.0.0 2 (0) 8388606
/10 255.192.0.0 4 (2) 4194302
/11 255.224.0.0 8 (6) 2097150
/12 255.240.0.0 16 (14) 1048574
/13 255.248.0.0 32 (30) 524286
/14 255.252.0.0 64 (62) 262142
/15 255.254.0.0 128 (126) 131070
/16 255.255.0.0 256 (254) 65534
/17 255.255.128.0 512 (510) 32766
/18 255.255.192.0 1024 (1022) 16382
/19 255.255.224.0 2048 (2046) 8190
/20 255.255.240.0 4096 (4094) 4094
/21 255.255.248.0 8192 (8190) 2046
/22 255.255.252.0 16384 (16382) 1022
/23 255.255.254.0 32768 (32766) 510
/24 255.255.255.0 65536 (65534) 254
/25 255.255.255.128 131072 (131070) 126
/26 255.255.255.192 262144 (262142) 62
/27 255.255.255.224 524288 (524286) 30
/28 255.255.255.240 1048576 (1048574) 14
/29 255.255.255.248 2097152 (2097150) 6
/30 255.255.255.252 4194304 (4194302) 2

Class B
Network Bits Subnet Mask Number of Subnets Number of Hosts
/16 255.255.0.0 0 65534
/17 255.255.128.0 2 (0) 32766
/18 255.255.192.0 4 (2) 16382
/19 255.255.224.0 8 (6) 8190
/20 255.255.240.0 16 (14) 4094
/21 255.255.248.0 32 (30) 2046
/22 255.255.252.0 64 (62) 1022
/23 255.255.254.0 128 (126) 510
/24 255.255.255.0 256 (254) 254
/25 255.255.255.128 512 (510) 126
/26 255.255.255.192 1024 (1022) 62
/27 255.255.255.224 2048 (2046) 30
/28 255.255.255.240 4096 (4094) 14
/29 255.255.255.248 8192 (8190) 6
/30 255.255.255.252 16384 (16382) 2

Class C
Network Bits Subnet Mask Number of Subnets Number of Hosts
/24 255.255.255.0 0 254
/25 255.255.255.128 2 (0) 126
/26 255.255.255.192 4 (2) 62
/27 255.255.255.224 8 (6) 30
/28 255.255.255.240 16 (14) 14
/29 255.255.255.248 32 (30) 6
/30 255.255.255.252 64 (62) 2

Class D
CIDR Block Supernet Mask Number of Class C Addresses Number of Hosts
/14 255.252.0.0 1024 262144
/15 255.254.0.0 512 131072
/16 255.255.0.0 256 65536
/17 255.255.128.0 128 32768
/18 255.255.192.0 64 16384
/19 255.255.224.0 32 8192
/20 255.255.240.0 16 4096
/21 255.255.248.0 8 2048
/22 255.255.252.0 4 1024
/23 255.255.254.0 2 512

Enable SSH on ESXI 5 , via the VSPHERE Client

·         First start the vSphere Client

·         Select the ESXi host in the configurations tab

·         Select Security Profile

 

·         Click Properties

 

·         Select SSH Services > Options > select “start up policy” > OK

 

** note to self;  everyones on the latest and greatest **

SSL Cert Convert .pfx to .key & .crt and .pem format

This for my future reference, ie when I have to deal with apache based certs ( vs IIS )

Download and install windows port of OpenSSL here

** you will need to know your password if you password protect your cert **

Command to enter. 1st part ( extract the .key )

openssl
pkcs12 -in [yourfile.pfx] -nocerts -out [keyfile-encrypted.key]

eg

openssl pkcs12 -in d:\temp\star.name_of_cert_godaddy.pfx -nocerts -out d:\temp\star.name_of_cert_godaddy.key

** eg I have installed the openssl app in C, I have placed my temp cert in D:\temp

 

2nd part ( extract the .crt )

openssl
pkcs12 -in [yourfile.pfx] -clcerts -nokeys -out [certificate.crt]

eg

openssl pkcs12 -in d:\temp\star.name_of_cert_godaddy.pfx -clcerts -nokeys -out d:\temp\star.name_of_cert_godaddy.crt

 

Sometimes you need unencrypted key files

openssl
rsa -in [keyfile-encrypted.key] -out [keyfile-decrypted.key]

eg

openssl rsa -in d:\temp\star.name_of_cert_godaddy.key -out d:\temp\star.name_of_cert_godaddy.nopass.key

 

If you need it in PEM format

openssl
rsa -in [keyfile-encrypted.key] -outform PEM -out [keyfile-encrypted-pem.key]

openssl rsa -in d:\temp\star.name_of_cert_godaddy.nopass.key -outform PEM -out d:\temp\star.name_of_cert_godaddy.nopass.pem.key

 

note self – no more searching internet, see your own notes.

SanDisk Ultra

SD Cards We Recommend for Dash Cameras

 

 

Learnt the hardway. Avoid these cards for dashcams – video etc. if you have an accident or trying to catch the low life scratching your car. The vital footage wont be there..

 

 

Looks OK on the surface – however the footage are about 2 weeks old.

 

Delete all file, should be OK now, right.

 

 

Add some files to the sd card. Then I unplug the usb card reader and plug it back. All files are back.

 

Soo.. its broken – I have tried formatting, low level format etc. no good. Time to get a new card based on MLC tech not TLC technology and it wont be covered under warranty.

https://www.sandisk.com.au/about/legal/warranty/warranty-apac