subnetting

[robert]

lets say a B class address 152.133.175.0
is subnetted using 255.255.240.0 mask

now i have first range
152.133.16.254 to 152.133.17.254 .......... to 30
and
33-46 --------13 networks
49-62 --------13 networks...
65-78 --------13 networks each with 254 hosts
and so on.....

does this mean that all these subents can communicate with each other. or
does it mean that they need a router to communicate.
e.g only 33 through 46 can communicate with other
and only
49 through 62 can communicate with each other

but for 34 to communicate with 44, i would need a router. (is this correct)

sorry for the stupid question, but i havent quite grasped the concept of
subnetting.
i think that since they all have the same mask they should be able to
communicate.

 

[Doug Sherman [MVP]]

Well, if you apply a subnet mask of 255.255.240.0 to an IP address of
152.133.175.0, it is on a subnet which has a range of 152.133.160.1 to
152.133.175.254. So, I don't really follow your number of subnets or their
ranges. But, the answer to your question is: Yes, if two computers have IP
addresses which are not on the same subnet, then they need a router in order
to communicate. To put it differently: If you tell a computer to ping an
IP address which it calculates is not on its subnet, it will send the ping
request to its default gateway or a static route if one is configured for
the target subnet.

Doug Sherman
MCSE Win2k/NT4.0, MCSA, MCP+I, MVP

2.133.0.0

 

[robert]

thanx for your reply

Well, if you apply a subnet mask of 255.255.240.0 to an IP address of
152.133.175.0, it is on a subnet which has a range of 152.133.160.1 to
152.133.175.254. So, I don't really follow your number of subnets or their
ranges. But, the answer to your question is: Yes, if two computers have IP
addresses which are not on the same subnet, then they need a router in order
to communicate. To put it differently: If you tell a computer to ping an
IP address which it calculates is not on its subnet, it will send the ping
request to its default gateway or a static route if one is configured for
the target subnet.

Doug Sherman
MCSE Win2k/NT4.0, MCSA, MCP+I, MVP

2.133.0.0