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Linux bond or team multiple network interfaces cards (NICs) into single bonded interface

Friday, September 4th, 2009

Finally today I had implemented NIC bonding (bind two NICs so that it works as a single device for load balancing and/or fault tolerance).  The idea here is to improve performance by pumping out more data from both NICs via NIC bonding/teaming

This box act as datastore server for my test VMware environment.  Each virtual machine is run on top of an ESXi box, and the storage is stored on this server.  Each virtual disk is anywhere between 15GB and 50GB.  Since the virtual disks are stored on a separate piece of hardware from the virtualizing hardware, we must have a high level of throughput for our network traffic.  I am using CentOS 5.3 for the purpose of this document.  This process should readily work for most if not all Red Hat based distro’s.  Click to continue »

Posted in Linux, Netowrking, Technical | No Responses »

Subnet Reference

Monday, January 21st, 2008

I use this all the time to find out how many ip’s are in a subnet mask or to find the CIDR Prefix for a certain range etc…

Subnet Mask
CIDR Prefix
Total IP’s
Usable IP’s
Number of Class C networks

255.255.255.255

/32

1

1

1/256th

255.255.255.254

/31

2

0

1/128th

255.255.255.252

/30

4

2

1/64th

255.255.255.248

/29

8

6

1/32nd

255.255.255.240

/28

16

14

1/16th

255.255.255.224

/27

32

30

1/8th

255.255.255.192

/26

64

62

1/4th

255.255.255.128

/25

128

126

1 half

255.255.255.0

/24

256

254

1

255.255.254.0

/23

512

510

2

255.255.252.0

/22

1024

1022

4

255.255.248.0

/21

2048

2046

8

255.255.240.0

/20

4096

4094

16

255.255.224.0

/19

8192

8190

32

255.255.192.0

/18

16,384

16,382

64

255.255.128.0

/17

32,768

32,766

128

255.255.0.0

/16

65,536

65,534

256

255.254.0.0

/15

131,072

131,070

512

255.252.0.0

/14

262,144

262,142

1024

255.248.0.0

/13

524,288

524,286

2048

255.240.0.0

/12

1,048,576

1,048,574

4096

255.224.0.0

/11

2,097,152

2,097,150

8192

255.192.0.0

/10

4,194,304

4,194,302

16,384

255.128.0.0

/9

8,388,608

8,388,606

32,768

255.0.0.0

/8

16,777,216

16,777,214

65,536

254.0.0.0

/7

33,554,432

33,554,430

131,072

252.0.0.0

/6

67,108,864

67,108,862

262,144

248.0.0.0

/5

134,217,728

134,217,726

1,048,576

240.0.0.0

/4

268,435,456

268,435,454

2,097,152

224.0.0.0

/3

536,870,912

536,870,910

4,194,304

192.0.0.0

/2

1,073,741,824

1,073,741,822

8,388,608

128.0.0.0

/1

2,147,483,648

2,147,483,646

16,777,216

0.0.0.0

/0

4,294,967,296

4,294,967,294

33,554,432

Posted in Netowrking, Technical | No Responses »