Subnetting

[gampt]

We have subnetted our Internal Network. We used an I.P. range of 172.16.16.0-254, 172.16.17.0-254, 172.16.18.0-254, 172.16.19.0-254 and mask 255.255.252.0. We created a subnet range of 172.16.10.0-254 and maske 255.255.255.0. Our routers are configure to route to approprate network. We are able to ping workstation on the both subnett but we are not able to get to the Internet on new subnet we creates. Anyone have any ideas on what to do?

More Information:

1. Subnetting is essentially the modification of a single IP network to create two or more logically visible sub-sections
2. Subnetting has guidelines regarding the use of the first and the last subnets, known as subnet zero and the all-ones subnet, respectively
3. Define variable length subnetting and how you can use it to create subnetted address prefixes that match the number of hosts on a particular subnet
4. Subnetting is the process of breaking down an IP network into smaller sub-networks called "subnets
5. The first subnet obtained from subnetting has all bits in the subnet bit group set to zero (0)

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[hothanhminh]

If I understand correctly, you are trying to split your class B into two subnets, but with one subnet being 75% of the addresses and the other subnet being 25% of the adresses. You can't do that. The subnets must be equal in size. And all subnets must use the same netmask.

More Information:

1. Subnetting, documented in RFC 950, originally referred to the subdivision of a class-based network into subnetworks, but now refers more generally to the subdivision of a CIDR block
2. There is substantially more to IP subnetting and network design than could possibly be described here
3. Subnetting involves dividing an IP address range into two or more separate ranges, called subnets
4. This ulitity will help you understand and verify that you know subnetting the Cisco CCNA way
5. Understanding subnetting is important, learning binary math conversions is important, and I devote an entire chapter on subnetting theory and binary math
6. This edition of Networking 101 will expand on the previous Subnets and CIDR article, in the interest of promoting a thorough understanding of subnetting

[vanthai88]

no they don't, if he has set his router up correctly. he has to make sure that if he is NOT using static routes in his router configuration that he is using a routing protocol that supports VLSM, i.e., RIP version 2 or EIGRP.



that's the purpose of routing and subnetting: not having to have everyone on the same subnet.



hope this helps.

More Information:

1. It will make the subnetting questions easy that might otherwise be quite difficult, save you a great deal of time that you can use on other questions
2. The main weakness of conventional subnetting is in fact that the subnet ID represents only one additional hierarchical level in how IP addresses are interpreted and used for routing
3. Custom subnet masks are those that differ from these default subnet masks when you are doing subnetting or supernetting
4. Subnetting A Subnet is a directory listing of IP numbers that re used to address on the internet The number is logical divided so that each part of the number represents a certain function Usually
5. Subnetting is a set of techniques that you can use to efficiently divide the address space of a unicast address prefix for allocation among the
6. For lack of a fancy IP subnetting calculator, these are great subnetting references to have around
7. Although subnetting can be done for a variety of reasons, from departmental to geographic to political