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Today's Topics:
1. Re: Question (Simon)
2. Re: Question (Leslie Rhorer)
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Message: 1
Date: Sat, 4 Jun 2022 21:14:42 +0100
From: Simon <dh...@thehobsons.co.uk>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: Question
Message-ID: <38a47e1a-7134-4c40-9e49-97cfee0c0...@thehobsons.co.uk>
Content-Type: text/plain; charset=us-ascii
Leslie Rhorer <lesrho...@siliconventures.net> wrote:
> On 6/3/2022 11:42 PM, Gregory Sloop wrote:
>> I assume you're talking about dhcp renewals? Yeah, if you look at the
>> protocol, only the discover is broadcast.
>> A client renewal asks the server it got the lease from for the "renewal,"
>> directly. Only after not getting a renewal, will it then try a
>> discover/broadcast again.
>>
>> Which might be impacting your not seeing broadcast traffic. If all your
>> machines have leases, they'll continue to unicast extension requests to the
>> server that initially granted the lease. (And get them, if things are
>> working right.) Thus no broadcasts - at least until a lease expires (or gets
>> old enough.)
Did you look into this aspect ?
You may need to force some clients to drop their lease so they will start again
by broadcasting Discover packets.
Simon
------------------------------
Message: 2
Date: Sat, 4 Jun 2022 15:20:26 -0500
From: Leslie Rhorer <lesrho...@siliconventures.net>
To: dhcp-users@lists.isc.org
Subject: Re: Question
Message-ID: <5e6df25c-d156-fa0b-ea84-b8a816bd0...@siliconventures.net>
Content-Type: text/plain; charset=UTF-8; format=flowed
On 6/4/2022 3:14 PM, Simon wrote:
> Leslie Rhorer <lesrho...@siliconventures.net> wrote:
>
>> On 6/3/2022 11:42 PM, Gregory Sloop wrote:
>>> I assume you're talking about dhcp renewals? Yeah, if you look at the
>>> protocol, only the discover is broadcast.
>>> A client renewal asks the server it got the lease from for the "renewal,"
>>> directly. Only after not getting a renewal, will it then try a
>>> discover/broadcast again.
>>>
>>> Which might be impacting your not seeing broadcast traffic. If all your
>>> machines have leases, they'll continue to unicast extension requests to the
>>> server that initially granted the lease. (And get them, if things are
>>> working right.) Thus no broadcasts - at least until a lease expires (or
>>> gets old enough.)
> Did you look into this aspect ?
> You may need to force some clients to drop their lease so they will start
> again by broadcasting Discover packets.
??? Not deeply.? I checked back after a few hours, and packets were
coming in on both interfaces.? I didn't take note of whether they were
broadcast, or not.? Later I will go ahead and shut down one of the
servers for a few hours to make sure everything stays up, and then
switch active servers for a few hours just to be certain.? At this point
I am pretty confident everything is working, but it never hurts to be sure.
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End of dhcp-users Digest, Vol 164, Issue 14
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