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[Costantino, Domenico]

Hello,
I have a doubt, but it is creating problems for some clients.

The scenario is as follows:
I have two failover servers with version 4.2.1
A client sends a DHCPDISCOVER broadcast to two servers
Only one server sends DHCPOFFER
Both servers receives the DHCPREQUEST (where client specify the server choosed)

Nevertheless both servers sends a DHCPACK (with the same IP but with different ID servers), this means that if the client get a
DHCP ACK from the server that had not chosen, that is with a different ID servers, the client begins again with the process of DISCOVER

I would understand if is this behavior RFC or "draft-ietf-dhc-failover-12" compliant?
Why I have not found anything explaining , someone can answer to my question is very important!

Follow  DHCP log file

secondary server:

Oct 25 11:43:00 isc-d02 dhcpd: DHCPDISCOVER from 06:d0:d6:0f:c6:88 via 10.200.124.1: load balance to peer DHCP-IMS-Failover

Oct 25 11:43:01 isc-d02 dhcpd: DHCPREQUEST for 10.200.125.125 (10.221.2.225) from 06:d0:d6:0f:c6:88 via 10.200.124.1

Oct 25 11:43:01 isc-d02 dhcpd: DHCPACK on 10.200.125.125 to 06:d0:d6:0f:c6:88 via 10.200.124.1

Oct 25 11:43:01 isc-d02 dhcpd: bind update on 10.200.125.125 from DHCP-IMS-Failover rejected: incoming update is less critical than outgoing update
...

Oct 25 11:44:46 isc-d02 dhcpd: DHCPDISCOVER from 06:d0:d6:0f:c6:88 via 10.200.124.1: load balance to peer DHCP-IMS-Failover

Oct 25 11:44:47 isc-d02 dhcpd: bind update on 10.165.81.127 from DHCP-IMS-Failover rejected: incoming update is less critical than outgoing update

Oct 25 11:44:47 isc-d02 dhcpd: DHCPREQUEST for 10.200.125.125 (10.221.2.225) from 06:d0:d6:0f:c6:88 via 10.200.124.1

Oct 25 11:44:47 isc-d02 dhcpd: DHCPACK on 10.200.125.125 to 06:d0:d6:0f:c6:88 via 10.200.124.1

Oct 25 11:44:47 isc-d02 dhcpd: bind update on 10.200.125.125 from DHCP-IMS-Failover rejected: incoming update is less critical than outgoing update


----------------------------------------

primary server:

Oct 25 11:43:00 isc-d01 dhcpd: DHCPDISCOVER from 06:d0:d6:0f:c6:88 via 10.200.124.1

Oct 25 11:43:01 isc-d01 dhcpd: DHCPOFFER on 10.200.125.125 to 06:d0:d6:0f:c6:88 via 10.200.124.1

Oct 25 11:43:01 isc-d01 dhcpd: DHCPREQUEST for 10.200.125.125 (10.221.2.225) from 06:d0:d6:0f:c6:88 via 10.200.124.1

Oct 25 11:43:01 isc-d01 dhcpd: DHCPACK on 10.200.125.125 to 06:d0:d6:0f:c6:88 via 10.200.124.1
...


Oct 25 11:44:46 isc-d01 dhcpd: DHCPDISCOVER from 06:d0:d6:0f:c6:88 via 10.200.124.1

Oct 25 11:44:47 isc-d01 dhcpd: DHCPOFFER on 10.200.125.125 to 06:d0:d6:0f:c6:88 via 10.200.124.1

Oct 25 11:44:47 isc-d01 dhcpd: DHCPREQUEST for 10.200.125.125 (10.221.2.225) from 06:d0:d6:0f:c6:88 via 10.200.124.1

Oct 25 11:44:47 isc-d01 dhcpd: DHCPACK on 10.200.125.125 to 06:d0:d6:0f:c6:88 via 10.200.124.1



Best Regards
Domenico Costantino
Technical Consultant, EB SWCM Delivery
Hewlett-Packard Company
domenico.costantino at hp.com / Email
Via  Achille Campanile, 85
00144, Roma
ITALY
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