failover peer dhcp: address not available

[Glenn Satchell]

A quick look at the source shows this message is only defined in the
function isc_result_totext(). It's only called a couple of times with
"failover peer %s". In these situations it is setting up the failover
link.

As you mention there is traffic between to the failover port, then I would
check that there is only one instance of dhcpd running, and it is the one
you expect. The new OS may have pulled in a default dhcp server for you
during installation.

Also test that on the primary you can telnet to port 847 on the secondary.

As a side note, in the subnet definition include file you have

    option broadcast-address 255.255.255.255;

This needs to be set to the correct broadcast address for the subnet, or
left out. dhppd will calculate subnet mask and brocadcast address from the
subnet definition and netmask, so in general it is better to leave them
out to avoid incompatible settings.

regards,
-gkenn

On Sat, June 1, 2013 3:09 am, Oscar Ricardo Silva wrote:
> I recently reinstalled the operating system on our two dhcp servers and
> we're now seeing this message on the primary:
>
>
>
> May 31 11:38:25 primary-dhcp dhcpd: failover peer dhcp: address not
> available
> May 31 11:39:55 primary-dhcp dhcpd: failover peer dhcp: address not
> available
> May 31 11:41:25 primary-dhcp dhcpd: failover peer dhcp: address not
> available
> May 31 11:42:55 primary-dhcp dhcpd: failover peer dhcp: address not
> available
> May 31 11:44:25 primary-dhcp dhcpd: failover peer dhcp: address not
> available
> May 31 11:45:55 primary-dhcp dhcpd: failover peer dhcp: address not
> available
> May 31 11:47:25 primary-dhcp dhcpd: failover peer dhcp: address not
> available
> May 31 11:48:55 primary-dhcp dhcpd: failover peer dhcp: address not
> available
>
>
>
>  From looking at past messages to the list, it's been suggested there
> was a mismatch in dhcpd versions but I'm using the same configurations
> and version as I was before the OS replacement.  Here are the version
> numbers and configurations:
>
>
> Primary:
>
> # dhcpd -v
> Internet Systems Consortium DHCP Server 4.1-ESV-R7
> Copyright 2004-2012 Internet Systems Consortium.
>
>
> option domain-name-servers 192.168.185.41, 192.168.185.40 ;
> option ntp-servers 192.168.185.40, 192.168.185.41;
> default-lease-time 172800;
> max-lease-time 172800;
> one-lease-per-client true;
> ddns-update-style ad-hoc;
> ddns-updates off;
> authoritative;
> key-off-mac-address true;
> if substring (option dhcp-client-identifier, 0, 5) = 01:52:41:53:20 {
>          deny booting;
> }
> option voip-tftp-server-address code 150 = array of ip-address ;
> set vendor-string = option vendor-class-identifier;
> failover peer "dhcp" {
>           primary;
>           address 192.168.200.2;
>           port 647;
>           peer port 847;
>           peer address 192.168.201.2;
>           max-response-delay 60;
>           max-unacked-updates 10;
>           mclt 300;
> 	 split 128;
>           load balance max seconds 5;
>         }
> subnet 192.168.200.0 netmask 255.255.255.224 {
> 	}
> include "/dhcpd/dhcpd.networks.conf";
>
>
>
>
> Secondary:
>
> dhcpd -v
> Internet Systems Consortium DHCP Server 4.1-ESV-R7
> Copyright 2004-2012 Internet Systems Consortium.
>
>
> option domain-name-servers 192.168.185.40, 192.168.185.41 ;
> option ntp-servers 192.168.185.41, 192.168.185.40;
> default-lease-time 172800;
> max-lease-time 172800;
> one-lease-per-client true;
> ddns-update-style ad-hoc;
> ddns-updates off;
> authoritative;
> key-off-mac-address true;
> if substring (option dhcp-client-identifier, 0, 5) = 01:52:41:53:20 {
>          deny booting;
> }
> option voip-tftp-server-address code 150 = array of ip-address ;
> set vendor-string = option vendor-class-identifier;
> failover peer "dhcp" {
>           secondary;
>           address 192.168.201.2;
>           port 847;
>           peer port 647;
>           peer address 192.168.200.2;
>           max-response-delay 60;
>           max-unacked-updates 10;
>           load balance max seconds 5;
>         }
> subnet 192.168.201.0 netmask 255.255.255.224 {
> 	}
> include "/dhcpd/dhcpd.networks.conf";
>
>
>
>
>
> All the network definitions are in "/dhcpd/dhcpd.networks.conf" and the
> file looks like this:
>
> subnet 192.168.235.0 netmask 255.255.255.128 {
>                  pool {
>                          range 192.168.235.13 192.168.235.126;
>                          deny dynamic bootp clients ;
>                          failover peer "dhcp" ;
>                  }
>          option subnet-mask 255.255.255.128;
>          option broadcast-address 255.255.255.255;
>          option routers 192.168.235.1;
> }
>
>
>
> There are router ACLs between the two servers and iptables running on
> each but the entire /24 network for each server is allowed through. I
> can see traffic being exchanged between the two servers on ports 647 and
> 847.
>
> Any idea what's causing this error?
>
>
>
> Oscar
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