dhclient: lease renewal woes

Sten Carlsen stenc at s-carlsen.dk
Sun Sep 9 14:06:14 UTC 2012

Fixing a broken ISP implementation by breaking the client implementation?

I guess that is a fair deal? Maybe I should try that with some of the
public utilities?

On 09/09/12 15:54, Mr Dash Four wrote:
>> You should not blame the software for your ISP having a rubbish network.
> I don't, but I expect that every decently written piece of software to
> have a "plan B" which could be deployed - swiftly - if "plan A"
> doesn't seem to work. That, evidently, isn't happening with dhclient.
>> Incidentally, did you ever figure out why the client was not renewing
>> by broadcast at around 7/8 of the lease time which is what I assume
>> it's doing now ?
> A couple of factors, one being that the server specified in the server
> ID given in the lease acknowledgement is not responding to direct
> requests, which is what dhclient was doing (instead of switching to
> either a broadcast or the dhcp agent giving the lease in the first
> place).
> Another thing I've changed were these pre-defined periods - by default
> the lease renewal takes place when about 1/2 of the lease is still
> valid, and rebinds when 7/8 of that lease time has lapsed, give or
> take a randomly pre-selected interval. That may seem fine with short
> leases, but when the lease is long, the gap between 1/2 and 7/8 is
> quite a big one, so that is another thing I altered. It is all working
> now, so I am content with using dhclient for the time being. My "plan
> B" (yes, I do have one) was to switch to dhcpcd, if I couldn't fix the
> above problems.
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Best regards

Sten Carlsen

No improvements come from shouting:

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