DHCP Static binding not working as expected??
chamara samarakoon
chthsa123 at gmail.com
Sun Sep 9 15:50:31 UTC 2012
Hi,
First thank you very much for reply.
In my set up ip's issued first time will be bind as static using dhcp on
commit script.
Below are the all related conf files,
dhcpd.conf:------------------------------------------------------------------------------------
# DHCP Server - Configuration file for Primary
#
# File $Id: dhcpd.conf,v 1.9 2009/07/09 16:31:20 root Exp root $
# Global configuration
set vendorclass = option vendor-class-identifier;
#record the relay agent information options sent during
#the client's initial DHCPREQUEST message
stash-agent-options true;
# Make the server authoritative for the network segments that
# are configured, and tell it to send DHCPNAKs to bogus requests
authoritative;
# Allow each client to have exactly one lease, and expire
# old leases if a new DHCPDISCOVER occurs
one-lease-per-client true;
deny duplicates;
# Log to the local0 facility by default
#log-facility local0;
log-facility local7;
# Ping the IP address that is being offered to make sure it isn't
# configured on another node. This has some potential repercussions
# for clients that don't like delays.
ping-check true;
# Dynamic DNS Updates
#include "/etc/ddns-update.dnskey";
#include "/etc/dhcpd.conf_ddns";
# DHCP Failover, Primary
include "/etc/dhcpd.conf_primary";
# Subnet declaration
include "/etc/dhcpd.conf_subnet";
# Static IP addresses
include "/etc/dhcp_static_lease/dhcp_static_conf/dhcpd_static.conf";
on commit {
set ClientIP = binary-to-ascii(10, 8, ".", leased-address);
set ClientMac = binary-to-ascii(16, 8, ":", substring(hardware, 1, 6));
set ClientName = binary-to-ascii(10, 8, ".", leased-address);
set ClientGW = binary-to-ascii(10,8,".",config-option routers);
log(concat("Commit: IP: ", ClientIP, " Mac: ", ClientMac, " Name: ",
ClientName ,"ClientGW: ",ClientGW));
execute("/etc/script/dynamic2Static.sh",ClientIP,ClientMac,ClientName,ClientGW);
}
# EOF
-----------------------------------------------------------------------------------------------------------------------
/etc/dhcpd.conf_subnet:------------------------------------------------------------------------------------
subnet 51.101.0.0 netmask 255.255.224.0 {
option ntp-servers 172.17.0.1;
deny client-updates;
authoritative;
option broadcast-address 51.101.31.255;
option routers 51.101.0.1;
max-lease-time 31536000;
default-lease-time 31536000;
pool {
failover peer "XXXX";
deny dynamic bootp clients;
range 51.101.0.10 51.101.0.254;
}
-----------------------------------------------------------------------------------------------------------------------
/etc/dhcp_static_lease/dhcp_static_conf/dhcpd_static.conf----------------------------------
include "/etc/dhcp_static_lease/51.101.0.0.txt";
---------------------------------------------------------------------------------------------------------------------------
/etc/dhcp_static_lease/51.101.0.0.txt---------------------------------------------------------------------
host 51.101.0.10{
hardware ethernet 00:20:d2:3a:51:69;
fixed-address 51.101.0.10;
}
---------------------------------------------------------------------------------------------------------------------------
Regards,
chamara samarakoon.
On Sun, Sep 9, 2012 at 8:58 PM, Sten Carlsen <stenc at s-carlsen.dk> wrote:
> Hi
>
> It is very likely doing what you have asked it to do.
>
> For anybody on this list to be able to help you find out what happens and
> why that is different from what you want to happen, please post your
> dhcpd.conf in its entirety with no edits (except secret keys).
>
> First guess is that you give the fixed address inside your range of
> dynamic IPs, it must be outside or you will see the below happening.
>
>
>
> On 09/09/12 17:17, chamara samarakoon wrote:
>
> Hi,
>
> I am new to isc dhcp, and i am facing following situation , and need help
> to understand,
>
> Scenario.:
> I am having 3 devices called, A,B,C. On dhcp conf pool is restricted to *only
> one IP*.
> Also on dhcpd conf *static bind is enabled* for device A.
>
>
> 1.Plug device A to network -> with out issue device got IP
>
> DHCPOFFER on 51.101.0.10 to 00:20:d2:3a:51:69 via 51.101.0.1
> Commit: IP: 51.101.0.10 Mac: 0:20:d2:3a:51:69 Name: 51.101.0.10ClientGW:
> 51.101.0.1
>
> 2.Unplug device A and change the static conf MAC to B's MAC(Restart dhcpd
> server) and Plug device B
>
> No issue device B got IP,
> DHCPOFFER on 51.101.0.10 to 00:20:d2:39:24:f8 via 51.101.0.1
> Commit: IP: 51.101.0.10 Mac: 0:20:d2:39:24:f8 Name: 51.101.0.10ClientGW:
> 51.101.0.1
>
> 3. Replug the device A *with out removing device B*,
> A received the IP even though B is having it, A's IP is active and B's IP
> is not active.
>
> DHCPDISCOVER from 00:20:d2:3a:51:69 via 51.101.0.1: network 51.101.0.0/19:
> no free leases
> Reclaiming abandoned lease 51.101.0.10.
> ICMP Echo reply while lease 51.101.0.10 valid.
> Abandoning IP address 51.101.0.10: pinged before offer
> DHCPDISCOVER from 00:20:d2:3a:51:69 via 51.101.0.1: cancel load balance
> to peer XXX - no free leases
> DHCPDISCOVER from 00:20:d2:3a:51:69 via 51.101.0.1
> DHCPOFFER on 51.101.0.10 to 00:20:d2:3a:51:69 via 51.101.0.1
> Commit: IP: 51.101.0.10 Mac: 0:20:d2:3a:51:69 Name: 51.101.0.10ClientGW:
> 51.101.0.1
>
>
>
>
>
> Why this is happening, I do not want DHCPD to offer the IP to another
> device when it is bind on static file to another device.But strange thing
> is when i plug device C when only device B(*same way as device A plug in
> step 3 but this time not device A instead device C is used.*) is there ,
> C naver receive a IP as i expected.Help is very much appreciated,What is
> happening with device A and B??
>
>
> Thank You,
> chamara
>
>
>
>
>
>
>
>
>
>
>
>
>
> --
> chthsa
>
>
> _______________________________________________
> dhcp-users mailing listdhcp-users at lists.isc.orghttps://lists.isc.org/mailman/listinfo/dhcp-users
>
>
> --
> Best regards
>
> Sten Carlsen
>
> No improvements come from shouting:
> "MALE BOVINE MANURE!!!"
>
>
> _______________________________________________
> dhcp-users mailing list
> dhcp-users at lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
>
--
chthsa
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