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wrong subnet mask - no free leases

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On one of our /25 subnets one of the members doesn't want to assign leases.
According to syslog the member thinks there are no free leases.

DHCPDISCOVER from xx:xx:xx:xx:xx:xx via bond0 TransID 0b847e9f: network no free leases


If I put the DHCP range from FO association to the failing member, I do get a correct subnet mask in the syslog.

DHCPDISCOVER from xx:xx:xx:xx:xx:xx via TransID 81555b1e: network no free leases


So, I put the member showing the correct subnet mask as the single member for that subnet and now all clients are getting an IP.

Why is there a difference in the recognition of the subnet mask between those two members?

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