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How to Limit MAC addresses in my DHCP Linux server

Posted on 2009-07-11
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Last Modified: 2013-12-06
Hi all ...

Hi have dhcp linux server , it is work fine , but I need to specify MAC's addresses for Trusted PC Only witch Only I need to get dynamic ip from dhcp , so if another/Unowned  PC's connect to my switch then it can not get ip from my dhcp

Note : I need PC get Dynamic IP NOT Static/Reserved  IP

my desrto is CentOS 5.3

Thank ..


Show my DHCP configurations
############################
## DHCP Configurations
## Configured By KING SABRI
############################
 
# ---> Options
 
ddns-update-style none; # keep it simple for now ( donn't use this option when you have DNS server )
ignore client-updates;  # here too authoritative ( donn't use this option when you have DNS server )
default-lease-time 600;
max-lease-time 7200;
authoritative;
DHCPARGS=eth1;          # what interface to listen on as DHCP
# ---> END
 
# ---> Subnet 30.0.0.0/8
 
subnet 30.0.0.0 netmask 255.0.0.0 {
 
       option routers                  30.0.0.1;         # gateway is eth1 LAN interface
       option subnet-mask              255.0.0.0;        # subnet mask
       option domain-name              "30.0.0.1";       # domain name given to client
       option domain-name-servers      30.0.0.1;         # the IP of your ISP's nameservers you're using
       option broadcast-address        30.255.255.255;   # Broadcast
       range 30.0.0.11 30.0.0.100;                       # the range of IP's your clients will get
# ---> END

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Question by:eng-sabri
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DCMBS earned 500 total points
ID: 24831894
Hi.  MAC address filtering can be done ip IPtables MC Module.  It is not a DHCP function.

Check the following link.

http://www.cyberciti.biz/tips/iptables-mac-address-filtering.html
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by:eng-sabri
ID: 24833619
Thank you DCMBS for help , but I know how to allow and prevent MAC from iptables

I think sir there are options can support my request like playing with

 host apex {

      hardware ethernet 00:A0:78:8E:9E:AA;
      fixed-address 192.168.1.4;
   }

you can see " fixed-address 192.168.1.4  "

so I think there are some options do not force fixed ip of put " if statement  " or thing like that  
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Expert Comment

by:DCMBS
ID: 24834032
Well I'm not sure what you are tring to achieve.  If you use iptables to restrict connections based on MAC addess then if a connection is allowed it will get a dynamic IP address from DHCP.  I don't know any way to do this just using DHCP.  DHCP issues dynamic or reserved IP addresses.  A Dynamic IP address will be provided to any MAC address that does not have a reservation allocated to it. A reserved address can be issued to a nominated MAC address.
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Author Comment

by:eng-sabri
ID: 24846883
thank you DCMBS ..

but I think Limitation/Handling offering IP's this is DHCP business because it depend on MAC to offer this service to it must me handle MAC's ,, I think I sow this function in Windows DHCP server

so ..

Do you have Ideas ?
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LVL 9

Expert Comment

by:DCMBS
ID: 24847295
I have never seen this as part of a DHCP server in any O/S.  Even in wireless routers the MAC filtering function is seperate from DHCP.  Someone may come along and contradict me but in my experience I have never seen this.
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