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發(fā)表于 2004-10-15 11:36 |只看該作者 |倒序?yàn)g覽

此 script 可根據(jù)每個(gè)子網(wǎng)中 hosts 的個(gè)數(shù)及子網(wǎng)數(shù)目劃分子網(wǎng)。并列出
相應(yīng)的 prefix, netmask, total subnet number, hosts per subnet.

#!/bin/ksh
#
# This script produces subnet number and broadcast address
# according to network number, subnet number and hosts number
# per subnet.
#
set -A network ${1//(\D)/ }
if [ $# -ne 3 ]; then
echo
echo Usage: $0 netwok_number subnet_number hosts_per_subnet
echo
echo For example:
echo
echo " $0 192.9.200.0 3 20"
echo
exit
fi
# Check the network number format
if [ ${#network[*]} -ne 4 ]; then
echo Invalid network format
exit
fi
# Check the network class invalidation
for (( i=0; i<=3; i++ )); do
if [ ${network[$i]} -gt 255 ]; then
echo Invalid network class.
exit
elif [ ${network[$i]} -ge 240 ]; then
echo The network you input is a multicast address.
exit
fi
done
# Check the network class
if [ ${network[0]} -le 127 ]; then
bits=24
elif [ ${network[0]} -ge 128 ] && [ ${network[0]} -lt 192 ]; then
bits=16
else
bits=8
fi
# Get the bits needed for subnets and hosts
while true
do
if [ $((2**subnet)) -ge $2 ]; then
break
else
(( subnet++ ))
fi
done
while true
do
if [ $((2**host - 2)) -ge $3 ]; then
break
else
(( host++ ))
fi
done
if [ $(( subnet + host )) -gt $bits ]; then
echo Too many subnets or hosts in your configuration
exit
fi
for (( i=31; i > (31 - host); i -- )); do
net[$i]=0
done
for (( i=0; i <= (31 - host); i ++ )); do
net[$i]=1
done
for (( l=0; l <= 7 ; l ++ )); do
(( a[0] += (2**(7 - l) * net[l])))
(( a[1] += (2**(7 - l) * net[l + 8])))
(( a[2] += (2**(7 - l) * net[l + 16])))
(( a[3] += (2**(7 - l) * net[l + 24])))
done
echo
echo Network prefix: $(( 32 - host ))
echo Network mask: ${a[0]}.${a[1]}.${a[2]}.${a[3]}
echo Total subnets: $(( 2**(bits - host)))
echo Hosts per subnet: $(( 2**host - 2))
echo
echo list $2 out of $(( 2**(bits - host))) subnets::
echo
for i in ${network[*]}
do
j=7
while [ $j -ge 0 ]
do
k=$((2**$j))
if [ $(( $i & $k )) -eq $k ]; then
net[n]=1
broadcast[n]=1
else
net[n]=0
broadcast[n]=0
fi
(( n ++ ))
(( j -- ))
done
done
for (( i=31; i > (31 - host); i -- )); do
net[$i]=0
broadcast[$i]=1
done
#for (( i=0; i < (2**subnet); i ++ )); do
for (( i=0; i < $2; i ++ )); do
set -A a
for (( j=0; j < subnet; j ++ )); do
k=$((2**$j))
if [ $(( $i & $k )) -eq $k ]; then
net[$((32 - host - subnet + j))]=1
broadcast[$((32 - host - subnet + j))]=1
else
net[$((32 - host - subnet + j))]=0
broadcast[$((32 - host - subnet + j))]=0
fi
done
for (( l=0; l <= 7 ; l ++ )); do
(( a[0] += (2**(7 - l) * net[l])))
(( a[1] += (2**(7 - l) * net[l + 8])))
(( a[2] += (2**(7 - l) * net[l + 16])))
(( a[3] += (2**(7 - l) * net[l + 24])))
(( a[4] += (2**(7 - l) * broadcast[l])))
(( a[5] += (2**(7 - l) * broadcast[l + 8])))
(( a[6] += (2**(7 - l) * broadcast[l + 16])))
(( a[7] += (2**(7 - l) * broadcast[l + 24])))
done
echo Network number: ${a[0]}.${a[1]}.${a[2]}.${a[3]} " " Broadcast address: ${a[4]}.${a[5]}.${a[6]}.${a[7]}
done