[Dibbler] DHCPv6-PD Solicit instead of Request when NoBinding failure occurs during IA_PD Renew

Deepak Krishnan deepak.r.krishnan at gmail.com
Tue Jun 16 07:17:41 CEST 2020

Hi Tomek,

Thanks for the input.

On code walkthrough and validation, found that REQUEST msg is not being
sent since function stops its execution with log "*Unable to send REQUEST.
There are no backup servers left.*".
Thereafter, SOLICIT message is being sent to the DHCPv6 server in the

TClntMsgRequest::TClntMsgRequest(TOptList opts, int iface)
    :TClntMsg(iface, SPtr<TIPv6Addr>(), REQUEST_MSG) {
    int backupCount = ClntTransMgr().getAdvertiseLstCount();
    if (!backupCount)
        Log(Error) << "Unable to send REQUEST. There are no backup servers
left." << LogEnd;
        setState( opts, STATE_NOTCONFIGURED);
        this->IsDone = true;
Is there any tweak which can be put which forcefully does a REQUEST msg
even though no backup servers present in the network?

I wrote a patch which invokes client-notify script upon expiration
(alongwith setting of the parameters ) to meet my requirements and its
working fine.



On Sun, Jun 14, 2020 at 11:44 AM Deepak Krishnan <
deepak.r.krishnan at gmail.com> wrote:

> Hi All,
> When NoBinding failure occurs during          IA_PD Renew, DHCPv6
> client(dibbler-client) *MUST send DHCPv6 Request*  according to IETF RFC
> 3633 Section 12.1 "Requesting router behavior" & IETF RFC 3315 Section
> 18.1.8 "Receipt of Reply messages".
> *But currently when NoBinding failure is obtained from DHCPv6 server for
> IA_PD Renew request, dibbler-client is sending SOLICIT message instead of
> the REQUEST message.*
> Could you please provide inputs or suggestions on how/where to handle this
> issue?
> Regards,
> Deepak
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