Re: dhcpd doesn't acknowledge dhcp requests

Posted by perl-list on Jun 09, 2015; 5:20pm
URL: http://isc-dhcp-users.193.s1.nabble.com/dhcpd-doesn-t-acknowledge-dhcp-requests-tp124p197.html

Question ... I noticed option 82 information in your packet dump.  How is that ending up in there?

The packet dump doesn't appear to show a relay agent in play, so option 82 shouldn't exist...

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From: "Sean McMurray" <[hidden email]>
To: "Users of ISC DHCP" <[hidden email]>
Sent: Tuesday, June 9, 2015 1:30:13 PM
Subject: Re: dhcpd doesn't acknowledge dhcp requests

I have stripped dhcpd.conf all the way down to this:

     log-facility local6;

     subnet 10.112.0.0 netmask 255.248.0.0 {
       option routers 10.112.0.1;
       pool {
         range 10.112.1.0 10.112.255.255;
       }
     }

I have disabled SELinux. I have disabled iptables.
I have purged the leasefile.
Still, dhcpd does not respond to DHCPDISCOVERs.


On 06/08/2015 03:21 PM, Peter Rathlev wrote:

> On Fri, 2015-06-05 at 14:49 -0700, Sean McMurray wrote:
>> strace shows the daemon receiving requests but not responding.
>> I'm stumped as to why it won't respond.
> That certainly seems strange. Have you tried removing the log statements
> completely? I would call it a bug if that changes anything, but it would
> be easy to try.
>
> With the stock CentOS 7 package it should not be SELinux related, unless
> there was an error in the definitions. However, could you try disabling
> SELinux if you haven't already?
>
> Other than that I can only think of starting the daemon with a trace
> file (-tf flag), which should let someone with adequate skills figure
> out exactly what happens inside the process.
>

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