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Today's Topics:
1. failover (richard lucassen)
2. Re: failover (richard lucassen)
3. Why would client request DHCP option 60 -
vendor-class-identifier ? (Bob Harold)
----------------------------------------------------------------------
Message: 1
Date: Fri, 28 Jan 2022 14:44:24 +0100
From: richard lucassen <mailingli...@lucassen.org>
To: dhcp-users@lists.isc.org
Subject: failover
Message-ID: <20220128144424.9abccff1d6d0ba83d53c2...@lucassen.org>
Content-Type: text/plain; charset=US-ASCII
Hello list,
I'm busy configuring two machines of which only one will connect to an
ISP on a /25 network using dhclient.
On the active machine eth2 is up, on the backup machine eth2 is down
(and vice versa of course)
In order to get the same ip (which is important) I need to query from
the same MAC address (that's no problem). But when trying this here at
home using isc-dhcp-server (Debian Bookworm, I have no idea which dhcp
server the ISP has) I get different ip addresses, even though the
MAC,uid and hostname are the same:
lease 203.0.113.64 {
starts 5 2022/01/28 13:36:21;
ends 5 2022/01/28 13:46:21;
cltt 5 2022/01/28 13:36:21;
binding state active;
next binding state free;
rewind binding state free;
hardware ethernet 00:0d:b9:21:ba:d8;
uid "af-pw failover";
client-hostname "af-pw";
}
lease 203.0.113.64 {
starts 5 2022/01/28 13:36:21;
ends 5 2022/01/28 13:36:33;
tstp 5 2022/01/28 13:36:33;
cltt 5 2022/01/28 13:36:21;
binding state free;
hardware ethernet 00:0d:b9:21:ba:d8;
uid "af-pw failover";
}
lease 203.0.113.65 {
starts 5 2022/01/28 13:36:46;
ends 5 2022/01/28 13:46:46;
cltt 5 2022/01/28 13:36:46;
binding state active;
next binding state free;
rewind binding state free;
hardware ethernet 00:0d:b9:21:ba:d8;
uid "af-pw failover";
client-hostname "af-pw";
}
lease 203.0.113.65 {
starts 5 2022/01/28 13:36:46;
ends 5 2022/01/28 13:36:51;
tstp 5 2022/01/28 13:36:51;
cltt 5 2022/01/28 13:36:46;
binding state free;
hardware ethernet 00:0d:b9:21:ba:d8;
uid "af-pw failover";
}
I added this to the original Debian dhclient.conf file:
backoff-cutoff 2;
initial-interval 1;
send dhcp-client-identifier "af-pw failover";
send host-name = "af-pw";
Why is the dhcp server providing two different addresses?
Richard.
--
richard lucassen
http://contact.xaq.nl/
------------------------------
Message: 2
Date: Fri, 28 Jan 2022 14:55:22 +0100
From: richard lucassen <mailingli...@lucassen.org>
To: dhcp-users@lists.isc.org
Subject: Re: failover
Message-ID: <20220128145522.909804523bbd3ace1e282...@lucassen.org>
Content-Type: text/plain; charset=US-ASCII
On Fri, 28 Jan 2022 14:44:24 +0100
richard lucassen <mailingli...@lucassen.org> wrote:
> Why is the dhcp server providing two different addresses?
Apparently it was the client side /var/lib/dhcp/dhclient.eth2.leases
file. I threw these away and now it works :)
--
richard lucassen
http://contact.xaq.nl/
------------------------------
Message: 3
Date: Fri, 28 Jan 2022 15:44:53 -0500
From: Bob Harold <rharo...@umich.edu>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Why would client request DHCP option 60 -
vendor-class-identifier ?
Message-ID:
<CA+nkc8ABA+4pPAE+SkPDcfF0eUpBfqys6rjCMO=gubeonzm...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Some DHCP clients send option 60 - vendor-class-identifier - to let the
DHCP server know what type of device (or operating system) it is, so the
server can send back the proper values for some options, both vendor
options and standard options.
I am seeing some clients include option 60 in the request list - the list
of options that the client is asking the DHCP server to send back to the
client. Why would a client want option 60 sent back from the server?
--
Bob Harold
DNS and DHCP Hostmaster - U of Michigan
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