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Today's Topics:
1. Option 82 Issues (Mike Hammett)
2. Re: Option 82 Issues (Christian Kratzer)
----------------------------------------------------------------------
Message: 1
Date: Fri, 24 Aug 2018 19:02:15 -0500 (CDT)
From: Mike Hammett <isc-dhcp-us...@ics-il.net>
To: dhcp-users@lists.isc.org
Subject: Option 82 Issues
Message-ID:
<283893702.2516.1535155330930.JavaMail.mhammett@ThunderFuck>
Content-Type: text/plain; charset="utf-8"
=====
# dhcpd.conf
option domain-name "[redacted]";
default-lease-time 60000;
max-lease-time 720000;
ddns-update-style none;
log-facility local7;
# Local
subnet [redacted] netmask 255.255.255.224 {
deny unknown-clients;
}
# Genoa
subnet 172.19.50.0 netmask 255.255.255.0 {
authoritative;
deny unknown-clients;
}
include "/etc/dhcp/dhcpd.d/Genoa.mgmt";
# DSLAMs
subnet 192.168.120.0 netmask 255.255.255.0 {
}
=====
=====
#Genoa.mgmt
host Genoa_01_01_01 {
host-identifier option agent.circuit-id "Genoa_01_01 atm 1/DSL1:0.36";
fixed-address 172.19.50.1;
}
host Genoa_01_01_02 {
host-identifier option agent.circuit-id "Genoa_01_01 atm 1/DSL2:0.36";
fixed-address 172.19.50.2;
}
host Genoa_01_01_03 {
host-identifier option agent.circuit-id "Genoa_01_01 atm 1/DSL3:0.36";
fixed-address 172.19.50.3;
}
[cut for brevity]
=====
It's not going to serve any local DHCP, only remote, but I figured out I needed
a local subnet for it to even fire up.
I don't want any pools, only reservations\hosts assigning the same IP to the
same DSLAM port (well, to be more specific, to the line I have configured to
send from the DSLAM) every time.
I added the DSLAMs subnet to stop this, " DHCPDISCOVER from d8:b6:b7:ea:8d:44
via 192.168.120.168: unknown network segment", but instead I got this, "
DHCPDISCOVER from d8:b6:b7:ea:8d:44 via 192.168.120.168: network
192.168.120.0/24: no free leases". It isn't supposed to be getting an address
in the 192.168 range, but in the 172.19 range. That's why I specified the host
file.
Webmin recognizes all of the host entries (although not the circuit-id
information because it doesn't support it), so I assume they're setup
correctly.
I also get this, but Google was no help, " parse_option_buffer: malformed
option vendor.<unknown> (code 808464740): option length exceeds option buffer
length." Calix says the agent.circuit-id field can support 63 characters and
I'm only using 27. Could be related, could not be. I pulled the information in
agent.circuit-id out of tcpdump as dhcpd didn't seem to have a way of revealing
that.
Thoughts?
-----
Mike Hammett
Intelligent Computing Solutions
Midwest Internet Exchange
The Brothers WISP
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------------------------------
Message: 2
Date: Sat, 25 Aug 2018 09:02:49 +0200 (CEST)
From: Christian Kratzer <ck-li...@cksoft.de>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: Option 82 Issues
Message-ID:
<alpine.bsf.2.21.9999.1808250858200.6...@nocfra1.cksoft.de>
Content-Type: text/plain; format=flowed; charset=US-ASCII
Hi,
On Fri, 24 Aug 2018, Mike Hammett wrote:
<snipped/>
> # Genoa
> subnet 172.19.50.0 netmask 255.255.255.0 {
> authoritative;
> deny unknown-clients;
> }
>
>
> include "/etc/dhcp/dhcpd.d/Genoa.mgmt";
> # DSLAMs
> subnet 192.168.120.0 netmask 255.255.255.0 {
> }
> #Genoa.mgmt
> host Genoa_01_01_01 {
> host-identifier option agent.circuit-id "Genoa_01_01 atm 1/DSL1:0.36";
> fixed-address 172.19.50.1;
> }
> host Genoa_01_01_02 {
> host-identifier option agent.circuit-id "Genoa_01_01 atm 1/DSL2:0.36";
> fixed-address 172.19.50.2;
> }
> host Genoa_01_01_03 {
> host-identifier option agent.circuit-id "Genoa_01_01 atm 1/DSL3:0.36";
> fixed-address 172.19.50.3;
> }
<snippped/>
> I added the DSLAMs subnet to stop this, " DHCPDISCOVER from d8:b6:b7:ea:8d:44
> via 192.168.120.168: unknown network segment", but instead I got this, "
> DHCPDISCOVER from d8:b6:b7:ea:8d:44 via 192.168.120.168: network
> 192.168.120.0/24: no free leases". It isn't supposed to be getting an address
> in the 192.168 range, but in the 172.19 range. That's why I specified the
> host file.
your issue is that your request is coming from the 192.168.120.0/24 range which
does not match the 172.19.50.0/24 range your have cofigured for your hosts.
You have two options depending on your network topology:
1. configure the relay to send from the 172.19.50.0/24 range.
2. put bot 192.168.120.0/24 and 172.19.50.0/24 subnets into a shared network.
Greetings
Christian
--
Christian Kratzer CK Software GmbH
Email: c...@cksoft.de Wildberger Weg 24/2
Phone: +49 7032 893 997 - 0 D-71126 Gaeufelden
Fax: +49 7032 893 997 - 9 HRB 245288, Amtsgericht Stuttgart
Mobile: +49 171 1947 843 Geschaeftsfuehrer: Christian Kratzer
Web: http://www.cksoft.de/
------------------------------
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