[DHCPDISCOVER]unknown network segment.

Wang, Yu ywang10 at fsu.edu
Wed Oct 15 17:08:11 UTC 2014

What are these IPs X.X.X.162 and X.X.X.163? Are they gateways (under FHRP) or some machines? You have gateway defined as X.X.X.161 but dhcpdiscover came from .162 and .163.

Yu Wang
Network Architect
Information Technology Services
The Florida State University
yu.wang at fsu.edu

From: dhcp-users-bounces at lists.isc.org [mailto:dhcp-users-bounces at lists.isc.org] On Behalf Of Eugène Ngontang
Sent: Wednesday, October 15, 2014 12:56 PM
To: Users of ISC DHCP
Subject: [DHCPDISCOVER]unknown network segment.

Hi guys,

I've seached and find many people with the same issue on internet, but I don't understand what's real mater in my case.

In fact I have in dhcpd conf file a block defining a subnet like this :

subnet X.X.X160 netmask {
        option routers                  X.X.X.161;
        option subnet-mask    ;
        option nis-domain               "mynisdomain.com<http://mynisdomain.com>";
        option domain-name              "mydomain.org<http://mydomain.org>";
        option domain-name-servers      Y.Y.Y.3, Y.Y.Y.3;
        range                           X.X.X.162 X.X.X.190;
        default-lease-time 21600;
        max-lease-time 43200;


Howerver my client is not getting any ip address, and from my dhcp server I see this error in the logs :

Oct 12 04:02:27 SERVERHOSTNAME dhcpd: DHCPDISCOVER from 00:aa:aa:aa:aa:aa via X.X.X.163: unknown network segment
Oct 12 04:02:27 SERVERHOSTNAME dhcpd: DHCPDISCOVER from 00:aa:aa:aa:aa:aa  via X.X.X.162: unknown network segment

Please can youo help to check what could be the error?

Thank you a lot.

Eugène NG
ngonta_e at epitech.net<mailto:ngonta_e at epitech.net>
sympavali at gmail.com<mailto:sympavali at gmail.com>
Aux hommes il faut un chef, et au chef il faut des hommes!
L'habit ne fait pas le moine, mais lorsqu'on te voit on te juge!
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