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Change IP POOL for RAS aerver

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7 replies

by myteinfo

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Tried to configure RAS IP pool starting IP from x.x.x.100 I need 50 clients connections.

I went to RAS server TCP/IP Configuration TAB and entered the following in the area: USE STATIC ADDRESS POOL

Entered address as: x.x.x.100 entered mask as: 255.255.255.192 then the ras came out automatically to IP range as: x.x.x.102 To x.x.x.126 Number of address for clients is 63

It doesn't look right number if I use 126-102=24 only.

Thanks in advance for any helpfull solution.

7 replies

by deltree

The mask you have chosen borrows the first two bits of the last octet for network addressing. This leaves the last six bits for hosts or a maximum of 62 hosts per subnet.
subnet 1 gives you host address range .1-62(63 being the all ones host address.
subnet 2, host address range .65-126
subnet 3, host address range .129-190
subnet 4, host address range .193-254

When you assigned a static address pool on RAS, by starting at 100, you limit the available host addresses since subnet 2 only is addressible through .126.
The simplest way to get the needed size pool is to start with 126-50= .76
Actually you will need to start with .74 since RAS uses the first two.

Hope that helps!

by myteinfo

I Propose this range

IP Address: x.x.x.74
Mask x.x.x.203
Range x.x.x.76 - x.x.x.125

Does this setting look Ok to you.

Thank Very much

by deltree

Looks good except for the subnet mask. x.x.x.203 is not a valid mask unless you know something about subnetting that I don't.
You need to use 255.255.255.192 for your scheme to work.

Good Luck!
If you have any more questions, I'll be happy to help.

by myteinfo

When I put IP as: x.x.x.x.74
Mask: x.x.x.192
It rejected and the error said invalid ip and give me a ip as x.x.x.64
so I change to;
IP: x.x.x.64
Mask: x.x.x.192
Range is x.x.x.66 To x.x.x126
Number of address for client is 61

Will this setting make the scheme to work? I reboot the server. Connection OK
If this setting does not work for the scheme, what problem I may have?
What is a correct IP and maks?

Please let me know. Thanks Peter

by deltree

It is interesting that RAS would not allow you to use .74 as a starting point when it DID allow you to use .100. I will look into why this might happen. However, the new scheme will work just fine.
You have just set up RAS to use the entire subnet 2 of the 4 possible subnets.
IP range x.x.x.65-126
mask .192

I will point you to the discussion center on techrepublic for a explaination of masks and IP addressing. Just type subnet mask in the search window.

Good Luck

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