Regarding the dhcp lease time

[Murali Krishna]

Hi,

Could you please confirm, Having two different versions on server and
client side can lead to these kind of issues? or does this impact the
system?

Thanks & Regards,
Muralikrishna CH

On Tue, Apr 16, 2019 at 12:47 PM Sten Carlsen <stenc at s-carlsen.dk> wrote:

>
>
> On 16/04/2019 06.10, Murali Krishna wrote:
>
> Hi,
>
> Thanks for your inputs.
>
> I quickly checked in my system.
> From "/etc/dhcpd.conf", i could clearly see that 600 is set to both max
> and default. This output is from server side.
>     max-lease-time 600;
>     default-lease-time 600;
>
> In this case the only other explanation I can think of is a rogue server
> on your network. This would require a closer study of the actual packet
> capture.
>
> On the client side, "/etc/dhclient.conf" says:
> send dhcp-lease-time 3600;
>
> Thanks & Regards,
> Muralikrishna CH
>
> On Tue, Apr 16, 2019 at 12:25 AM Sten Carlsen <stenc at s-carlsen.dk> wrote:
>
>>
>>
>> On 15/04/2019 18.48, Murali Krishna wrote:
>>
>> Hi,
>>
>> Im facing issue with the dhcp lease time.
>> Im having two different DHCP versions in server and client side. I could
>> see that the lease file at the client had very huge value of the dhcp lease.
>>
>> version on the server side:
>> isc-dhcpd-4.3.6-P1
>>
>> Version on the client side:
>> isc-dhcpd-4.2.1-P1
>>
>> Content(part) of the lease file at the client side:
>> dhcp-lease-time 152292816;
>>
>> Output of pcap file used for debugging:
>>
>>    - #28 <https://gordon.advantech.com.tw/issues/28>: Client sends "DHCP
>>    Request" to server and asks the lease time 3600s.
>>    - #29 <https://gordon.advantech.com.tw/issues/29>: The server replies
>>    the "DHCP ACK" to client, but the lease time is 152292816s.
>>
>> The server is configured with two times, max-lease-time and
>> default-lease-time. It will send those times to the client, in this case it
>> looks like the server is configured to send very long times (4.8 years). It
>> is up to the client when it wants to renew the lease, the 3600s is clearly
>> within the bounds of what it is given.
>>
>> If you want shorter lease times, the server needs to be configured to
>> hand out those times instead.
>>
>>
>>
>>
>> Please help in getting this resolved. Also please share in what kind of
>> situations the server will respond to the client with a huge lease value.
>>
>> Thanks & Regards,
>> Muralikrishna CH
>>
>>
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>
>
> --
>
>
>
>
> Thanks & Regards,
> Muralikrishna CH
>
>
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>
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-- 




Thanks & Regards,
Muralikrishna CH
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