Regarding the dhcp lease time

[Sten Carlsen]

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
> <mailto: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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>
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>
>
> -- 
>
>
>
>
> Thanks & Regards,
> Muralikrishna CH
>
>
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