Failure of dhcp server failover

[Patrick Trapp]

It will be a while before I have visibility on our current configuration to compare it to yours or to Niall's suggestion. We did not replace the old configuration, just removed those singleton pools when their devices migrated to a different solution, so I am hopeful there remain useful clues.

> On May 1, 2016, at 2:38 PM, Niall O'Reilly <niall.oreilly at ucd.ie> wrote:
> 
>> On 1 May 2016, at 19:41, Eugene Grosbein wrote:
>> 
>> Thank you, this is interesting. But in my case all requests from single AP came with the same gwaddr,
> 
>  Ah.  Whenever I have configured Cisco router, I have been able to configure the relay function
>  per-VLAN rather than per port.  If that’s a possibility for you, it may be interesting.  From
>  what you say, router isn’t currently separating the VLANs.
> 
>> so tuples (MAC address, relay IP address) are not unique, they are the same for requests
>> coming from distinct vlans. That is, same DHCP relay processes requests from multiple vlans
>> and inserts same gwaddr into them.
> 
>  I’ve never used option 82 with a host { } declaration, and don’t know how to.
>  I suspect that the place to put the option-82 filtering may be in the
>  subnet { } declaration rather than in the host { } declaration itself.
> 
>  It may be that your best solution is to take courage from Patrick Trapp’s
>  assurance the option 82 works, and debug as he suggests.
> 
>  I’m sorry that I’m not able to offer a solution.
> 
>  Best regards,
>  Niall O’Reilly
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