DHCP failover doesn't receive DHCP requests in secondary server
clists at buxtonfamily.us
Wed Aug 15 15:59:42 UTC 2018
Both are active. Roughly 50% of clients will be answered by each, under normal circumstances.
> On Aug 15, 2018, at 8:58 AM, Roberto Carna <robertocarna36 at gmail.com> wrote:
> Dear, thanks for your response...So I will review the DHCP agent as you said.
> But now I have a question:
> If both DHCP servers always receive DHCPREQUEST packets, does it mean
> that in normal condition (primary and secondary server are running UP)
> both DHCP servers responds these requests ??? Or only the primary
> server responds the requests in despite of the secondary server is UP
> too ???
> Thanks a lot again, regards !!!
> 2018-08-15 12:38 GMT-03:00 perl-list <perl-list at network1.net>:
>> The problem isn't with the secondary server. The DHCP packets must always go to both servers. If the packets are relayed from a relay agent, then the relay agent must be configured to send to both of the DHCP servers (On a Cisco router, that would involve having ip helper-address listed twice, for example).
>> If no relay, then the DHCP servers must both be on the same LAN with the clients.
>> When both of the primary and secondary servers are running, you should see logs of the DHCP packets in both servers logs.
>> ----- Original Message -----
>>> From: "Roberto Carna" <robertocarna36 at gmail.com>
>>> To: "Users of ISC DHCP" <dhcp-users at lists.isc.org>
>>> Sent: Wednesday, August 15, 2018 11:06:08 AM
>>> Subject: DHCP failover doesn't receive DHCP requests in secondary server
>>> Dear people,
>>> I´ve implemented a failover scheme with ISC-DHCP-SERVER in two
>>> different servers, with the same version of the package and OS.
>>> Everything seems to be OK, but when a execute "service isc-dhcp-server
>>> stop" in the primary server, in the secondary server I can see:
>>> Aug 15 11:52:01 dhcp2 dhcpd: peer dhcp-failover: disconnected
>>> Aug 15 11:52:01 dhcp2 dhcpd: failover peer dhcp-failover: I move
>>> from normal to communications-interrupted
>>> what is correct, but after that the secondary server doesnt' receive
>>> any DHCPREQUEST packet from clients.
>>> So, my faoilover scheme doesn't work, because if primary server goes
>>> down, the secondary server doesn't receive any IP request from
>>> clients. When I start the isc-dhcp-server on primary server, at this
>>> moment I can see the DHCPREQUEST from clients to primary server.
>>> What can be the problem with the secondary server please ???
>>> Thanks a lot!!!
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>>> dhcp-users at lists.isc.org
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