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Today's Topics:
1. Re: Using OMAPI to release a DHCP lease on a failover pair
(sth...@nethelp.no)
2. Re: [Help]: dhcp concept and code part (Simon Hobson)
----------------------------------------------------------------------
Message: 1
Date: Thu, 30 Jul 2020 22:20:04 +0200 (CEST)
From: sth...@nethelp.no
To: dhcp-users@lists.isc.org, ptr...@nex-tech.com
Subject: Re: Using OMAPI to release a DHCP lease on a failover pair
Message-ID: <20200730.222004.02487889.sth...@nethelp.no>
Content-Type: Text/Plain; charset=us-ascii
> Interesting. You would only have two available addresses, right? The network
> address and the broadcast address? Which one does the device answer to?
When using IPv4 /31 there's really no "network address" or "broadcast
address". There are simply two IP addresses. One is the router and the
other is the client. Supported by lots of equipment, and also ISC
DHCP.
Example:
# Router is at lowest address of the /31
subnet 172.16.1.10 netmask 255.255.255.254
{
option routers 172.16.1.10;
range 172.16.1.11 172.16.1.11;
}
but you could also do
# Router is at highest address of the /31
subnet 172.16.1.10 netmask 255.255.255.254
{
option routers 172.16.1.11;
range 172.16.1.10 172.16.1.10;
}
There is no magic here.
Steinar Haug, Nethelp consulting, sth...@nethelp.no
------------------------------
Message: 2
Date: Thu, 30 Jul 2020 21:22:03 +0100
From: Simon Hobson <dh...@thehobsons.co.uk>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: [Help]: dhcp concept and code part
Message-ID: <d5bf814d-e065-4875-9a4f-42042a03e...@thehobsons.co.uk>
Content-Type: text/plain; charset=us-ascii
Kunal Chauhan <atkunalchau...@gmail.com> wrote:
> I am new to dhcp , I have read out dhcp docs at internet, but not clearly
> understand in a practical way how dhcp works on a piece of harware.
>
> How it can be implemented on some harware or soc.
I doubt you could implement it in hardware - there's just so much involved. As
both a primer and in-depth volume, I'd recommend you get hold of "The DHCP
Handbook" by Ted Lemon and Ralph Droms. That will explain how the protocol
works, and hopefully give you an idea of just how much is involved.
Apart from anything else, if you were to implement just DHCP in hardware, what
would you use the information for if there wasn't a software stack to use it ?
So in reality, you'd be needing to use a full software stack - even if it was
stripped down to the bare essentials. Once you are using software, then all the
components are already written for you.
Simon
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End of dhcp-users Digest, Vol 141, Issue 26
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