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DHCP Server on multiple LAN ports

stacy maughan

I am setting up a 4 port device for my home network.  One WAN port, and the other three ports for LAN, all on the same subnet.  How do I set up a common DHCP server for the three LAN ports?  When you set up a DHCP server, it requires you to choose a port.  It seems to me it would be more logical to associate a DHCP server with a zone.

 

Anyway, I've created a 3 port bridge for my LAN ports and associate my DHCP server to that bridge, which seems to work, but doesn't seem right.  Am I on the right track?



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    Hi Stacy,

    The first rule never assigns same subnet IP address on a different physical interface. Bridging is the correct thing, but that opens the communication between all the interfaces those are bridged.

    Thanks

  • 0 in reply to sachingurung

    Thank you for the reply, Sachin.

    I want to understand what you are saying, but I'm not quite sure what you mean by "the first rule never assigns same subnet IP address on a different physical interface" and what your point is.  Can you elaborate more?  I want to make sure I'm not missing something important.

    Bridging opening communication makes sense, but I think that would be the case regardless, since all the ports would be on a same subnet, right?  Well, for level 3 anyway.  Is there something I should be worried about given that I expect them to be on the same LAN segment?

    Is there an alternative I could consider to accomplish what I want?  It doesn't seem like I should have to bridge the ports to put them all on the same LAN segment (with the same DHCP server), but I'm pretty new to all this, so maybe I am worrying about nothing. 

    Thoughts anyone?

  • 0 in reply to stacy maughan

    Hi Stacy,

    I can understand, language can be deceiving. 

    "the first rule never assigns same subnet IP address on a different physical interface" - Interfaces reside on the physical layer, each physical layer must be defined with a unique network subnet. Assigning duplicate or overlapping network on more than one physical interface can confuse the iptable and arp table during the packet communication. 

    You are technically correct and the setup is clean.

    Thanks

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  • 0 in reply to stacy maughan

    Hi Stacy,

    I can understand, language can be deceiving. 

    "the first rule never assigns same subnet IP address on a different physical interface" - Interfaces reside on the physical layer, each physical layer must be defined with a unique network subnet. Assigning duplicate or overlapping network on more than one physical interface can confuse the iptable and arp table during the packet communication. 

    You are technically correct and the setup is clean.

    Thanks

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