Fail over serves on different VLANS

Klaus Vink Slott gqv604 at
Thu Jan 14 14:19:29 UTC 2016

Den 14-01-2016 kl. 13:45 skrev /dev/rob0:
> On Thu, Jan 14, 2016 at 01:18:00PM +0100, Klaus Vink Slott wrote:
>> How does the server "see if the other server makes an offer". Do
>> they need to bee on the same VLAN or is it communicated directly
>> between the servers?
> The dhcpd servers define a TCP port in their configuration.  They
> have an internal protocol by which their leases are communicated
> directly.
> See "CONFIGURING FAILOVER" in the dhcpd.conf(5) manual.

Thanks. I have been searching the manual - but did not find any 
information on which information is shared over the communication 
channel. However digging in once more I found "load balance max seconds" 
which suggest that time since the the first DHCPDISCOVER or DHCPREQUEST 
is used if the communication channel is not reliable.

As the dhcphelper distributes DHCPDISCOVER to both server I guess my 
worries has no reason.


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