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Adam Ross
Guest
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 Posted: Fri Aug 22, 2003 6:20 am Post subject: ip address config |
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I connect to the internet thru a cable company.
How come my ip address is a low first number, like in the 30's, but
according to the subnet mask right underneath of it, it is telling me its a
class c network. This must be a class A network, right?
-subnet mask is 255.255.252.0 |
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Bret
Guest
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| Posted: Fri Aug 22, 2003 6:39 am Post subject: Re: ip address config |
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On Thu, 21 Aug 2003 21:20:11 -0400, "Adam Ross"
<somebody@somewhere.com> wrote:
| Quote: | I connect to the internet thru a cable company.
How come my ip address is a low first number, like in the 30's, but
according to the subnet mask right underneath of it, it is telling me its a
class c network. This must be a class A network, right?
-subnet mask is 255.255.252.0
The mask only tells which part of the address is local. |
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Geoff
Guest
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| Posted: Mon Aug 25, 2003 7:18 pm Post subject: Re: ip address config |
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Adam Ross wrote:
| Quote: | I connect to the internet thru a cable company.
How come my ip address is a low first number, like in the 30's, but
according to the subnet mask right underneath of it, it is telling me
its a class c network. This must be a class A network, right?
-subnet mask is 255.255.252.0
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ip address don't follow the class a b c ranges anymore
do search for 'classless ip' on google |
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RJ
Guest
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| Posted: Wed Aug 27, 2003 7:33 am Post subject: Re: ip address config |
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On Thu, 21 Aug 2003 21:20:11 -0400, Adam Ross wrote:
| Quote: | I connect to the internet thru a cable company.
How come my ip address is a low first number, like in the 30's, but
according to the subnet mask right underneath of it, it is telling me its a
class c network. This must be a class A network, right?
-subnet mask is 255.255.252.0
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Network classes are defined as follows:
Class A: 0.* - 126.* (except 10.* which is reserved)
127.0.0.1 is the loopback address
Class B: 128.* - 192.167.* (except 172.* again reserved)
Class C: 192.169.* - 223.*
The Subnet mask simply tells your computer what IPs are local,
hence all IPs similar to your own in x.x.x.* (x being identical to your
own, * being wildcard), your ISP will not need to forward these packets through to the next
host between yourself and the destination. |
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Linda
Guest
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| Posted: Wed Aug 27, 2003 9:20 am Post subject: Re: ip address config |
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The ISP is not using a classfull addressing scheme. They are
subnetting! They are taking a single class A network ID and creating
over 16 thousand networks out of it (with the ID and mask you've
given). Thats subnetting, it is used all the time. Read up on it and
learn how to do binary math, it will come in handy on the network
exams like 70-216 (MS) net+ and all cisco. Your IP calculator will
work in the field but on the exams its all pencil and paper.
Linda
MCSE,MCSA,CCNA,A+,Net+
On Tue, 26 Aug 2003 22:33:10 -0400, RJ <fillionrj@NOSPAMsympatico.ca>
wrote:
| Quote: | On Thu, 21 Aug 2003 21:20:11 -0400, Adam Ross wrote:
I connect to the internet thru a cable company.
How come my ip address is a low first number, like in the 30's, but
according to the subnet mask right underneath of it, it is telling me its a
class c network. This must be a class A network, right?
-subnet mask is 255.255.252.0
Network classes are defined as follows:
Class A: 0.* - 126.* (except 10.* which is reserved)
127.0.0.1 is the loopback address
Class B: 128.* - 192.167.* (except 172.* again reserved)
Class C: 192.169.* - 223.*
The Subnet mask simply tells your computer what IPs are local,
hence all IPs similar to your own in x.x.x.* (x being identical to your
own, * being wildcard), your ISP will not need to forward these packets through to the next
host between yourself and the destination. |
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