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Full Discussion: Tools How to ignore requests in dhcpd?
Top Forums UNIX for Dummies Questions & Answers Tools How to ignore requests in dhcpd? Post 302769482 by chebarbudo on Tuesday 12th of February 2013 12:24:56 PM
Old 02-12-2013
Tools Tools How to ignore requests in dhcpd?
Hi there,

I setup a dhcp server on a debian.
It is designed to only assign ip addresses to a list of known hosts.
The config file looks like :
Code:
log-facility local6;
ignore unknown-clients;
subnet 172.16.0.0 netmask 255.255.0.0 { }
host 1 { hardware ethernet 00:03:2d:xx:xx:xx; fixed-address 172.16.101.151; }
host 2 { hardware ethernet 00:03:2d:yy:yy:yy; fixed-address 172.16.102.151; }
host 3 { hardware ethernet 00:03:2d:zz:zz:zz; fixed-address  172.16.103.151; }

The problem is that the log file show thousands of requests from unknown hosts that I was hopping to drop.
Code:
Feb 12 17:54:33 debian dhcpd: DHCPDISCOVER from 00:0b:3b:xx:xx:xx via 172.16.106.2: network 172.16/16: no free leases
Feb 12 17:54:33 debian dhcpd: DHCPDISCOVER from 00:04:a3:xx:xx:xx via 172.16.169.2: network 172.16/16: no free leases
Feb 12 17:54:35 debian dhcpd: DHCPDISCOVER from 00:04:8b:xx:xx:xx via  172.16.158.2: network 172.16/16: no free leases

Is there any way I can completely ignore the requests from unknown hosts (not even logging them)?

Thanks for your help
Santiago
 

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LEARN ABOUT SUSE

dhclient.leases

dhclient.leases(5)						File Formats Manual						dhclient.leases(5)

NAME

       dhclient.leases - DHCP client lease database

DESCRIPTION

       The Internet Systems Consortium DHCP client keeps a persistent database of leases that it has acquired that are still valid.   The database
       is a free-form ASCII file containing one valid declaration per lease.   If more than one declaration appears for a given  lease,  the  last
       one in the file is used.   The file is written as a log, so this is not an unusual occurrance.

       The format of the lease declarations is described in dhclient.conf(5).

FILES

       DBDIR/dhclient.leases

SEE ALSO

       dhclient(8), dhcp-options(5), dhclient.conf(5), dhcpd(8), dhcpd.conf(5), RFC2132, RFC2131.

AUTHOR

       dhclient(8)  was written by Ted Lemon under a contract with Vixie Labs.	 Funding for this project was provided by Internet Systems Consor-
       tium.  Information about Internet Systems Consortium can be found at https://www.isc.org.

																dhclient.leases(5)
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