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script for netmask check

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# 1  
Old 08-16-2005
script for netmask check
I want develop a script which should also check validity of netmask.
e.g.
/etc/netmasks
10.15.20.30 255.255.255.224

How can I check which IP adresses are valid for this netmask?
I think the best is use logical operations.
224 is 1 1 1 0 0 0 0 0

so is valid from 10.15.20.31 until 60
How is possible to check this with Solaris script ?

Best regards
Dieter
# 2  
Old 08-16-2005
You could do that, but you could also take the individual fields of the netmask, subtract them from 255 and add to your network address:

ie something like:
Code:
echo 10.15.20.30 255.255.255.224 | nawk -F'[    .]' '{print "ADDRESS RANGE:  " $1"."$2"."$3"."$4" - "255-$5+$1"."255-$6+$2"."255-$7+$3"."255-$8+$4}'

# 3  
Old 08-17-2005
netmasks
Hallo Reborg,

Very good, thank You for Your help.

Best regards
Dieter
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