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   Hi,
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   I have read 
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    <li data-sourcepos="1:1-1:133"><a href="https://kea.readthedocs.io/en/latest/arm/dhcp4-srv.html?highlight=subnet4#local-and-relayed-traffic-in-shared-networks">https://kea.readthedocs.io/en/latest/arm/dhcp4-srv.html?highlight=subnet4#local-and-relayed-traffic-in-shared-networks</a></li>
    <li data-sourcepos="2:1-2:124">and <a href="https://kea.readthedocs.io/en/latest/arm/dhcp4-srv.html?highlight=subnet4#using-a-specific-relay-agent-for-a-subnet">https://kea.readthedocs.io/en/latest/arm/dhcp4-srv.html?highlight=subnet4#using-a-specific-relay-agent-for-a-subnet</a></li>
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   But the following is not clear to me. Can someone help clarifying ?
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   - In ISC DHCP there is no subnet selectors (interface or relay address) , i.e no  "interface" nor "relay" parameter in Shared-Network. Why is it needed in KEA and not in DHCPD ? What is DHCPD using in order to select the subnet, since there is no "interface" nor "relay" parameter in the configuration file ? Why does KEA not use the same mechanism ?
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   - are "interface" and  "relay" exclusive or can we have both ?
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   Thanks,
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   Veronique
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