Listing IPs from the dhcpd.conf


 
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Old 11-09-2017
RedHat Listing IPs from the dhcpd.conf

Hy everybody,

Within a dhcpd.conf file, we got some fixed IP adresses from 192.168.0.1 - 192.168.0.254.

Sample:
Code:
#ddns-update-style interim;
ddns-update-style none;
ignore client-updates;
deny client-updates;
authoritative;

#### By red for PXE Booting
allow booting;
allow bootp;
### End by red

log-facility local6;

subnet 192.168.0.0 netmask 255.255.255.0 {
        # --- default gateway

        ##### By red for PXE booting
        class "pxeclients" {    match if substring(option vendor-class-identifier, 0, 9) = "PXEClient";
        next-server 192.168.0.1;
        filename "linux-install/pxelinux.0"; }
        #### End by red

        option routers 192.168.0.1;
        option subnet-mask 255.255.255.0;
        # option nis-domain             "domain.org";
        option domain-name "ensm.intranet";
        option domain-name-servers 192.168.0.1;
        option time-offset -18000;
        range dynamic-bootp 192.168.0.5 192.168.0.239;
        default-lease-time 3600;
        max-lease-time 7200;
        # we want the nameserver to appear at a fixed address

        group {
        use-host-decl-names true;

        host Naoui-EISN1A {
                hardware ethernet 00:71:CC:6E:A3:33;
                fixed-address 192.168.0.6;
                }

        host Labdazi-EISN1A {
                hardware ethernet C0:38:96:72:8B:5B;
                fixed-address 192.168.0.7;
                }

        host Zair-EISN1A {
                hardware ethernet 08:ED:B9:08:94:09;
                fixed-address 192.168.0.8;
                }

        host Laddi-EISN1A {
                hardware ethernet D0:53:49:CB:FE:0F;
                fixed-address 192.168.0.9;
                }

        host Zeghar-EISN1A {
                hardware ethernet C4:8E:8F:8F:45:A7;
                fixed-address 192.168.0.10;
    }
    

      }
}

We need a bash script which list all the IP's in one text file in a way that :

Those Ip's who are part of the dhcpd.conf will be listed one per line and will have a '#' symbol at the begining, such as :

Code:
#192.168.0.6
#192.168.0.7
#192.168.0.8
.......
.......

All the other IP's who are not part of the dhcpd.conf will be just listed one per line :

Code:
192.168.0.100
192.168.0.101
192.168.0.201
.........
.........

Thanks a lot for your help Smilie

red
 
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