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Today's Topics:
1. Re: Shortening lease on one subnetL: need reduce MCLT for
all? (John Wobus)
2. DHCP LDAP dhcpOption encoding (Sherman Lilly)
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Message: 1
Date: Fri, 11 Dec 2015 11:19:44 -0500
From: John Wobus <[email protected]>
To: Users of ISC DHCP <[email protected]>
Subject: Re: Shortening lease on one subnetL: need reduce MCLT for
all?
Message-ID: <[email protected]>
Content-Type: text/plain; charset=utf-8
> On an ISC DHCP server failover pair, version 4.2.5, I need to shorten
> the maximum DHCP lease time for one subnet from 2 hours to 20 minutes
> temporarily to allow the IP address ranges to be expanded. This is
> together with a Cisco ASR9k that I am told is working as a caching
> relay for the DHCP server pair.
>
> Now it seems reasonable to reduce the MCLT to ten minutes during the
> work. Is that correct? From my understanding, there will be rather
> counterproductive behaviour if the MCLT is left longer than the
> maximum lease: is that not the case?
I think it?s reasonable to design around leases longer than
the MCLT for ordinary use but I don?t think violating that breaks
everything: I imagine it just makes failure recovery less than
ideal.
We run a shorter lease time than the MCLT regularly, for
clients in our ?walled garden?, who we want to force to another
non-walled pool after they register with us, so we give them a
very short lease time. This approach has its own challenges, but
I don?t recall the MCLT discrepancy being any practical concern.
I don?t know anything about caching relays.
John Wobus
Cornell U IT
------------------------------
Message: 2
Date: Fri, 11 Dec 2015 21:20:57 +0000
From: Sherman Lilly <[email protected]>
To: "[email protected]" <[email protected]>
Subject: DHCP LDAP dhcpOption encoding
Message-ID:
<775174236735ba4e9c606781c315ef8703766cd...@main-mailbox4.knox-main.org>
Content-Type: text/plain; charset="us-ascii"
I don't know if anybody here will be able to help but I'll start here. I am
setting up a DHCP server with a LDAP backend. I have set up the DHCP
configuration and now setting up the LDAp backend. I have the basic structure
set up but when I try add a "dhcpOption" attribute it says it needs to be
binary value. Well after searching forever I have figured out it needs a
encoded value for the dhcpOption. Again searching and I found its a DHCP
encoding but I don't know what that is. Am I missing something?
Sherman Lilly
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End of dhcp-users Digest, Vol 86, Issue 7
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