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# Limit IP addresses on Connection Control

Posted on 2011-10-30
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Last Modified: 2012-06-27
SBS 2003 - I'm trying to enter Trend Micro's hosted email security IP address in the smtp virtual connector, connection control. The question is exactly how to enter them, the numbers from TM are:
150.70.149.0/27
216.99.131.0/24
I select a range and enter subnet address as 150.70.149.0 and subnet mask as 255.255.255.27, 216.99.131.0 and 255.255.255.24 for the other. However, no email seems to come thru. If I enter the subnet mask as 255.255.255.0 then email comes thru.
What's the correct way to enter this?

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Question by:dpacheco
10 Comments

LVL 77

Expert Comment

150.70.149.0/27 indicates an IP range from 150.70.149.0 to 150.70.149.31 (less network ID and broadcast address) and a subnet mask of 255.255.255.224

216.99.131.0/24  indicates an IP range from 216.99.131.0 to 216.99.131.254 (less network ID and broadcast address) and a subnet mask of 255.255.255.0

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LVL 77

Expert Comment

For the record: IP addresses are decimal representations of binary numbers, thus 255 = 11111111 and in tern a subnet mask of:
255.255.255.0 = 11111111.11111111.11111111.00000000  (24 1's)  which is why the /24 notation
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LVL 77

Expert Comment

Sorry hit enter by mistake.
And 255.255.255.224 = 11111111.11111111.11111111.11100000  (27 1's)  which is why the /27 notation
...in simple terms.
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LVL 1

Author Comment

OK but I'm still not sure how I would enter this in connection control, I select Group of computers, subnet address is 150.70.149.0 and subnet mask is 255.255.255.224? or am I making 31 entries for this number?
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LVL 77

Accepted Solution

If you use an IP address of 150.70.149.0 and subnet mask of 255.255.255.224 it will define a subnet of 150.70.149.0 to 150.70.149.31. So you just have to enter 150.70.149.0 and 255.255.255.224  (150.70.149.0/27 indicates the same thing)
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LVL 1

Author Closing Comment

Thanks.
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LVL 77

Expert Comment

I just checked Exchnage and it should accept 150.70.149.0/27 &  216.99.131.0/24 just like that.
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LVL 1

Author Comment

It does not let me enter a / - I'm in connection control...
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LVL 77

Expert Comment

I am assuming this is within Exchange and not Tren micro.
Sorry SBS 2003 you have to enter 150.70.149.0 and 255.255.255.224  SBS 2008/2010 will accept the 150.70.149.0/27  notation.
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LVL 1

Author Comment

Yes exchange 2003 not trend. Thanks.
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