DHCP Server not sending offers!
Eugène Ngontang
sympavali at gmail.com
Tue Sep 23 07:06:38 UTC 2014
Hi,
Updating the dhcpd to last release version solved the issue.
Thanks for your help.
Regards,
Eugène NG
2014-07-23 9:35 GMT+02:00 Eugène Ngontang <sympavali at gmail.com>:
> Hi Guys,
>
> Appologises for the delay, I'm a little bit busy my the work.
>
> I have desactivated the crontab this weekend, to reproduce the incident,
> and I got log from the server and one client, when the server stop sending
> offers.
>
> Here are three files :
>
> - dhcpd_log.txt => a copy of the /var/log/messages from the server
> - dhclient_log.txt => a copy of the /var/log/messages from the client
> - dhcpd.log => a copy of the /var/log/dhcpd.log from the server.
>
> I will be glad if you can investigate at the same time as me.
>
> Anywy I will look deeper at this specific log files if I can see special
> things and let you know.
>
> Thank you for your help.
>
> Best regards,
> Eugène NG
>
>
>
>
> 2014-07-19 15:16 GMT+02:00 Eugène Ngontang <sympavali at gmail.com>:
>
>> Thank you so much Glenn.
>>
>> I will give you a feedback in a while.
>>
>> With regards,
>> Eugène NG.
>> Le 19 juil. 2014 08:07, "Glenn Satchell" <glenn.satchell at uniq.com.au> a
>> écrit :
>>
>> Hi Eugene
>>>
>>> You are correct. The dynamic range is not used for hosts assigned an
>>> address via a fixed-address statement. But different people are offering
>>> ideas for you.
>>>
>>> The "range dynamic-bootp" assigns bootp leases to clients. The difference
>>> between bootp and dhcp is defined in several RFCs, but for our purpose we
>>> can think of dhcp as an enhanced bootp. One of the noticeable differences
>>> is that a bootp lease does not expire, so it is easy to run out of IPs if
>>> you have too many clients, even over a long timne. Eg the PC you got rid
>>> of two years ago is still holding one of your IPs. The isc-dhcp server
>>> handles both types of leases in the same way, with a flag to distinguish
>>> bootp from dhcp. It uses the same leases file. "range dynamic-bootp" was
>>> an example in the example dhcpd.conf distributed by RedHat, so that's
>>> probably where it came from.
>>>
>>> I see that you are running dhcpd version 3.0.5. this is a very old
>>> version, released in 2006. This was the default version with RedHat 5. If
>>> you upgrade to RedHat 6.x you get version 4.1_something. There have been
>>> many versions and fixes in the last 8 years. The next step before looking
>>> at problems with your setup would be to upgrade to a current version and
>>> see if you still see the problem. This is probably going to be the
>>> easiest
>>> path. Your current dhcpd.conf looks like it would work without change.
>>>
>>> This is from the Release Notes (RELNOTES) in a newer version:
>>>
>>> Changes since 3.0.5
>>>
>>> - Assorted fixes for broken network devices: Packet length is now
>>> determined from the IP header length field to finally calculate the
>>> UDP payload length, because some NIC drivers return more data than
>>> they actually received.
>>>
>>> regards,
>>> -glenn
>>>
>>> On Sat, July 19, 2014 12:07 am, Eugène Ngontang wrote:
>>> > But Maarten, the dynamic range is for host whose ip address is not
>>> > reserved. So if there nerver is a host requesting for a dynamic
>>> address,
>>> > will there be a dynamic lease too? where do bootp store its leases? Is
>>> it
>>> > in the same dhcpd.leases file?
>>> >
>>> > Thanks.
>>> >
>>> >
>>> > 2014-07-18 15:48 GMT+02:00 Eugène Ngontang <sympavali at gmail.com>:
>>> >
>>> >> Ok Maarten, I will look at this.
>>> >>
>>> >> In fact I'm not the one who set the "range dynamic-bootp" clausure, I
>>> >> guess the clients are using dhcp and bootp is not really required.
>>> >>
>>> >> But please, I know bootp is an old protocol, but I din't know the
>>> impact
>>> >> of using this clausure. I would like if possible to have a link where
>>> >> the
>>> >> difference between the two clausures is explained, and the impact of
>>> >> using
>>> >> "range dynamic-bootp" in lease offers.
>>> >>
>>> >> I will try investigating this way. Thanks.
>>> >>
>>> >> Regards,
>>> >> Eugène NG
>>> >>
>>> >>
>>> >> 2014-07-18 14:36 GMT+02:00 Maarten Carels <lists at carels.info>:
>>> >>
>>> >>> On 18 Jul 2014, at 14:22 , Eugène Ngontang <sympavali at gmail.com>
>>> >>> wrote:
>>> >>>
>>> >>> > @Maarten, that is what I didn't figure out.
>>> >>> >
>>> >>> > Nevertheless, I have a dynamic range, and fixed addresses.
>>> >>> >
>>> >>> > Please explain in more detail what you mean in your post about
>>> bootp.
>>> >>> Thank you my dear.
>>> >>>
>>> >>> If all your clients are using dhcp, change the range statement to
>>> >>> range 1.1.1.50 1.1.1.100;
>>> >>>
>>> >>> bootp is an old protocol that lacks the automatic lease expiration.
>>> >>>
>>> >>> And look at the place where the server is logging, usually somewhere
>>> in
>>> >>> /var/log. If it thinks it can't give a lease, it will log why.
>>> >>>
>>> >>> --maarten
>>> >>>
>>> >>> _______________________________________________
>>> >>> dhcp-users mailing list
>>> >>> dhcp-users at lists.isc.org
>>> >>> https://lists.isc.org/mailman/listinfo/dhcp-users
>>> >>>
>>> >>
>>> >>
>>> >>
>>> >> --
>>> >> ngonta_e at epitech.net
>>> >> 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!*
>>> >>
>>> >
>>> >
>>> >
>>> > --
>>> > ngonta_e at epitech.net
>>> > 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!*
>>> > _______________________________________________
>>> > dhcp-users mailing list
>>> > dhcp-users at lists.isc.org
>>> > https://lists.isc.org/mailman/listinfo/dhcp-users
>>>
>>>
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>>
>
>
> --
> ngonta_e at epitech.net
> 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! *
>
--
ngonta_e at epitech.net
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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