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Re: [dhcwg] Regarding DHCP Discover with Dest Ip as subnet broadcast

Venkataratnam Naidu <ratnameee@gmail.com> Mon, 18 May 2020 16:23 UTC

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From: Venkataratnam Naidu <ratnameee@gmail.com>
Date: Mon, 18 May 2020 21:53:03 +0530
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To: Ted Lemon <mellon@fugue.com>
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Subject: Re: [dhcwg] Regarding DHCP Discover with Dest Ip as subnet broadcast
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Hi Ted Lemon,

Thank you for the reply.  Dhcp client using 255.255.255.255 always works.
But wanted to know the dhcp server behavior when it receives
Discover/Request with below. And also would like to know any dhcp-client
implementations using the "subnet broadcast" as destination ip.

1. Destination ip is "subnet broadcast"  and the destination mac is
FF:FF:FF:FF:FF:FF
2. Destination ip is "subnet broadcast" and the destination mac is "unicast
mac"

Regards,
Venkat.

On Mon, May 18, 2020 at 9:29 PM Ted Lemon <mellon@fugue.com> wrote:

> On May 18, 2020, at 11:42 AM, Venkataratnam Naidu <ratnameee@gmail.com>
> wrote:
>
> Broadcast here means only all network broadcast(255.255.255.255) , or does
> it also includes the subnet broadcast.
>
>
> You want the link-local (255.255.255.255) broadcast. The subnet broadcast
> could in theory work, but if it’s resolving to a station address and not
> the ethernet broadcast address, you don’t have a subnet, and the host is
> not interpreting it as a broadcast address. You should just use
> 255.255.255.255—this will always work.
>
>
>

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