584b7561c1
Currently there is no way to have DHCP agents not announce DNS servers for a subnet. The current behaviour when the dns_nameservers option is set to '0.0.0.0' is that each agent will only announce itself instead of announcing the list of all dhcp agents for that subnet, which seems not too useful. So we redefine the meaning of this option to instruct the DHCP agent to not announce any DNS server in that case. Actually, going back to square one, it would be more natural to swap the meaning of "option unset" and "option 0.0.0.0", but that would change the default behaviour for all existing installation and thus does not seem feasible. Change-Id: I32d943360162c483ac1364100a21ab56b13517fb Closes-Bug: 1311040
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