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Top Forums Shell Programming and Scripting How to write bash script to subdivide a given subnet into a pre-defined number of smaller subnets? Post 302958573 by mail2rias on Friday 23rd of October 2015 11:18:14 AM
Old 10-23-2015
Linux How to write bash script to subdivide a given subnet into a pre-defined number of smaller subnets?

Bash script to subdivide a given subnet into a pre-defined number of smaller subnets. Show network/broadcast address, number of hosts and assign gateway.
For example:
Input:
./subnetter.sh 192.168.0.0/24 3 Output:
192.168.0.0/128 subnet 192.168.0.0 broadcast 192.168.0.127 gateway 192.168.0.100 hosts 125 192.168.0.128/192 subnet 192.168.0.128 broadcast 192.168.0.191 gateway 192.168.0.150 hosts 61 192.168.0.192/192 subnet 192.168.0.192 broadcast 192.168.0.255 gateway 192.168.0.200 hosts 61
 

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RLM_IPPOOL_TOOL(8)					      System Manager's Manual						RLM_IPPOOL_TOOL(8)

NAME
rlm_ippool_tool - dump the contents of the FreeRadius ippool database files SYNOPSIS
If an ipaddress is specified then that address is used to limit the actions or output. rlm_ippool_tool [-a] [-c] [-o] [-v] session-db index-db [ipaddress] Mark the entry nasIP/nasPort as having ipaddress rlm_ippool_tool -n session-db index-db ipaddress nasIP nasPort Update old format database to new. rlm_ippool_tool -u session-db new-session-db DESCRIPTION
rlm_ippool_tool dumps the contents of the FreeRADIUS ippool databases for analyses or for removal of active (stuck?) entries. Or with the -n argument adds a usage entry to the FreeRADIUS ippool databases. OPTIONS
-a Print all active entries. -c Report number of active entries. -r Remove active entries. -v Verbose report of all entries. -o Assume old database format (nas/port pair, not md5 output). -n Mark the entry nasIP/nasPort as having ipaddress. -u Update old format database to new. EXAMPLES
Given the syntax in the FreeRadius radiusd.conf: ippool myippool { range-start = 192.168.1.0 range-stop = 192.168.1.255 [...] session-db = ${raddbdir}/ip-pool.db ip-index = ${raddbdir}/ip-index.db } To see the number of active entries in this pool, use: $ rlm_ippool_tool -c ip-pool.db ip-index.db 13 To see all active entries in this pool, use: $ rlm_ippool_tool -a ip-pool.db ip-index.db 192.168.1.5 192.168.1.82 192.168.1.244 192.168.1.57 192.168.1.120 192.168.1.27 [...] To see all information about the active entries in the use, use: $ rlm_ippool_tool -av ip-pool.db ip-index.db NAS:172.16.1.1 port:0x2e8 - ipaddr:192.168.1.5 active:1 cli:0 num:1 NAS:172.16.1.1 port:0x17c - ipaddr:192.168.1.82 active:1 cli:0 num:1 NAS:172.16.1.1 port:0x106 - ipaddr:192.168.1.244 active:1 cli:0 num:1 NAS:172.16.1.1 port:0x157 - ipaddr:192.168.1.57 active:1 cli:0 num:1 NAS:172.16.1.1 port:0x2d8 - ipaddr:192.168.1.120 active:1 cli:0 num:1 NAS:172.16.1.1 port:0x162 - ipaddr:192.168.1.27 active:1 cli:0 num:1 [...] To see only information of one entry, use: $ rlm_ippool_tool -v ip-pool.db ip-index.db 192.168.1.1 NAS:172.16.1.1 port:0x90 - ipaddr:192.168.1.1 active:0 cli:0 num:0 To add an IP address usage entry, use: $ rlm_ippool_tool -n ip-pool.db ip-index.db 192.168.1.1 172.16.1.1 0x90 rlm_ippool_tool: Allocating ip to nas/port: 172.16.1.1/144 rlm_ippool_tool: num: 1 rlm_ippool_tool: Allocated ip 192.168.1.1 to client on nas 172.16.1.1,port 144 SEE ALSO
radiusd(8) AUTHORS
Currently part of the FreeRADIUS Project (http://www.freeradius.org) Originally by Edwin Groothuis, edwin@mavetju.org (http://www.mavetju.org) Mailing list details are at http://www.freeradius.org/ RLM_IPPOOL_TOOL(8)
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