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- Subnet Masks
- What are the difference between class A, B, and C subnet masks? Are there any limitations of Classless Interdomain Routing CIDR?The default masksare;A=255.0.0.0B=255.255.0.0C=255.255.255.0There are actually 5 classess but only three are used for normal routing and each of the three have a private or NAT address range. Here is a...
- Discussion threads 2007-10-24
- CIDR block & cisco pix 501
- I've recently order a CIDR block from my Business Cable provider. Before I had 2ip's set as static routes, but this doesn't seem to work.I'm trying to get the CIDR in the inside interface, and 1 extra ip address outside of the CIDR for the outside interface. Can anyone provide...
- Discussion threads 2007-02-21
- Countries that most activly probe your network?
- Ok, this post is purely based on a home machine that runs the pfctl firewall on a FreeBSD 6.1 system. This machine runs ftp, ssh, and Apache which all can be accessed by the Internet.When I set up my original machine, a 5.3 FreeBSD system. I noti
- Discussion threads 2006-10-15
- Cisco IP subnetting 101: An introduction to supernetting
- Brilliant!That was a great article and certainly one of the most articulate I have read on the subject! I don't know about anyone else, but articles of this quality that address TCP/IP and the nuts and bolts that accompany it are always to be welcomed!Many thanks!Thanks!Thank you for your...
- Discussion threads 2005-08-19
- IP Address and Subnetting.
- Please explain what the /24 mean in subnetting in the IP address stated below:192.16.30.15/24CIDR representation of the address and subnet mask. In this case your address, 192.16.30.15/24 is showing that the first (/24 bits of your address 192.168.1.15 represent the network and the last 8 bits of the address...
- Q&A 2005-03-30
- Expand your network by supernetting IP addresses
- Put simply, supernetting a TCP/IP network address is the opposite of subnetting it. Supernetting is also known as CIDR classless interdomain routing as defined by RFCs 1517, 1518, 1519, and 1520. In IPv4, CIDR is one way of attempting to manage the shortage of TCP/IP addresses until IPv6 takes over. Supernetting...
- Technical articles 2003-05-19
- IPv6: What you need to know
- IPv6 is touted as the way to provide relief for the impending shortage of network addresses—but there are other key features, as well. Here's a briefing on the transition to the new protocol.Many Chicken Littles out there will tell you that the Internet is eventually going to run out of...
- Technical articles 2000-04-11
- IP Subnet Calculator for IPv4 and IPv6 1.02 (Windows)
- Input an IP address and choose one of the following: number of subnet bits, the maximum number of desired subnets, the number of host bits, or the maximum number of desired hosts. The calculator gives you a bit-by-bit address visualization and generates a complete table of subnets. CIDR allows multiple...
- Software downloads 2007-11-06
- IP Subnet Calculator for IPv4 and IPv6 1.1.2007.1126 (Mac)
- Input an IP address and choose one of the following: number of subnet bits, the maximum number of desired subnets, the number of host bits, or the maximum number of desired hosts. The calculator gives you a bit-by-bit address visualization and generates a complete table of subnets. CIDR allows multiple...
- Software downloads 2007-12-19
Additional Resources
- CIDR
- CIDR was introduced to reduce the number of routing table entries by enabling route summarization and supernetting and make better use of the available IPv4 address space. so, why network administrators try to avoid creating too many networks inspite of using CIDR
- Q&A 2010-01-24
- Can we firewall China?
- Seeing that 99% of material I've ever downloaded from China has been attempting to hack my computer, and that even Google's own index has been compromised by redirecting the Googlebot to a legitimate source by a source in China I have decided that - in addition to China blocking all...
- Discussion threads 2007-10-25
- Create an IP addressing plan that will grow
- When you set up the first network for a small business, you may not give much thought to how the company's growth will affect your IP addressing scheme. By planning ahead at the beginning, you can ensure that you have plenty of addresses available to meet your organization's growing needs....
- Technical articles 2006-06-09
- CiscoKits CCNA Subnet Calculator 1.0 (Windows)
- CiscoKits is pleased to offer to you completely free our own CCNA Subnet Calculator that you can download and use to help you prepare for your Cisco certification exams. Subnetting is one of the key concepts on the Cisco CCNA certification exam. So you need to know it inside and...
- Software downloads 2009-09-19
- The Mask - IPV4 Calculator (The Internet Address Calculator) 2.01 (Mobile)
- Network addressing made easy.If you are a Network Planner, Network Designer, Network Administrator, or Tech Support Analyst, then this tool is a must. Avoid time-consuming and error-prone manual calculations when designing or troubleshooting an IPv4 network use The Mask IPv4 Calculator. The Mask is the easiest and most portable way...
- Software downloads 2010-02-08
- Select the right routing protocol for your network
- Routing protocols have far-reaching effects on the performance and reliability of your network, but sorting out the differences between them can be a challenge. Choose the best one for your network by taking a look at this detailed comparison.Many of us work on networks we didn’t have the luxury of...
- Technical articles 2002-01-04
- Secure connections to PostgreSQL
- The PostgreSQL database server is arguably one of the best SQL servers available, but it's not as easy for beginners to get a handle on it as with other SQL databases, such as MySQL. Where MySQL stores all of its credential information within the SQL database itself, PostgreSQL takes a...
- Blog posts 2007-11-19
- Cisco administration 101: What you need to know about EIGRP
- Enhanced Interior Gateway Routing Protocol EIGRP is one of the most popular internal routing protocols used by midsize and large companies. Not very familiar with this protocol? David Davis tells you what every network administrator needs to know about EIGRP. When it comes to internal routing protocols, the two...
- Technical articles 2005-09-29
- Cisco IP subnetting 101: An introduction to supernetting
- After reading David Davis' recent two-part series about the basics of Cisco IP subnetting, members asked for more. This week, David responds to one member's questions about changing bits on the subnet mask and supernetting a network. I recently wrote a two-part series about the basics of Cisco ...
- Technical articles 2005-08-18
- Whatmask 1.2 (Windows)
- Whatmask runs in a DOS shell Command Prompt. Whatmask is a small C program that will help you with network settings. Whatmask can work in two modes. The first mode which is how prior versions worked is to invoke Whatmask with only a subnet mask as the argument. In...
- Software downloads 2007-12-08
- Subnet 1.00 (Mobile)
- Subnet Mobile Application performs Major Subnetting Tasks for your network anytime anywhere. The application has been designed especially for mobile users. Users can subnet their network, perform minor or major network Subnetting calculations and also can gain information about the network. Subnet Gives Detail Information about the network to subnet...
- Software downloads 2010-01-03
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