DISCOVER bursts

[Milton W. Schober, Jr.]

What is the CPE?  We have seen something similar with Thomson IPTV set top 
boxes, but the problem is in the STB, not the server.

Milton Schober
----- Original Message ----- 
From: <Staffan.Ungsgard at teliasonera.com>
To: <dhcp-users at isc.org>
Sent: Friday, January 05, 2007 3:55 AM
Subject: DISCOVER bursts


> Hi
> We have problem with a special customers CPE, where the CPE send four 
> rapid DHCPDISCOVERS with just 20 milliseconds apart.
> When the DHCP server gets the DISCOVERS it issues different addresses on 
> each discover. I have snoop logs of the traffic, and the DISCOVERS are 
> indeed exactly the same in each DHCPDISCOVER. It seems that the when the 
> server handles the second DISCOVER, it doesn't "remeber" that is has 
> already offered a fresh ip address from an identical DHCPDISCOVER 20 ms 
> earlier.
> To furthermore illustrate this, we have a lease limit of two, so 
> technically it shouldn't offer more than two addresses to the same line 
> identifier even if the "Client Identifier" differed, but it isses three 
> different addresses and only barfs at the fourth DHCPDISCOVER saying "no 
> billing".
>
> Is there a race problem in the dhcp server ?
>
> The hardware is a Sun V210 running Solaris 8. No supermachine, but they're 
> still selling them.
>
> Best Regards
>
> -- Staffan Ungsgard
>
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>
> -- 
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.1.410 / Virus Database: 268.16.5/616 - Release Date: 1/4/2007
>
>