Option 82 Logging

[Frank Bulk]

Perhaps because previously your IP was coming out of the 192.168.1.0/29, and
you have the logging statement just in 192.168.1.192/28?

Frank

-----Original Message-----
From: dhcp-users-bounces at lists.isc.org
[mailto:dhcp-users-bounces at lists.isc.org] On Behalf Of Keith
Sent: Monday, December 29, 2014 12:47 PM
To: 'Users of ISC DHCP'
Subject: RE: Option 82 Logging

Hi.

So a quick update to this, I was wondering if because I was using everything
in
the
same /24, 192.168.1.0/24, the leases were not working correctly. Turns out
that
was the case.

I changed the dslam to use 192.168.2.0/24 instead and added that subnet to
dhcp.

Dhcpd.conf file:

default-lease-time 300;
max-lease-time 300;
allow bootp;
ddns-updates off;
ddns-update-style interim;

log-facility local7;

subnet 192.168.1.0 netmask 255.255.255.248 {
}

subnet 192.168.2.0 netmask 255.255.255.0 {
if exists agent.circuit-id
{
        log ( error, concat( "Lease for ", binary-to-ascii (10, 8, ".",
leased-address), " is connected to ", option agent.circuit-id)); }

        option routers 192.168.2.1;
        range 192.168.2.193 192.168.2.206;
}

===

As soon as I changed the subnet for the dslam to 192.168.2.0/24 it works.

Lease for 192.168.2.193 is connected to
Test-Dslam:1/2:0.35:VLAN=1:ifIndex=1003002
Dec 29 10:34:53 play dhcpd: DHCPDISCOVER from 00:d0:59:3d:e7:e5 via xl0
Dec 29 10:34:54 play dhcpd: DHCPOFFER on 192.168.2.193 to 00:d0:59:3d:e7:e5
(CWPORT45) via xl0
Dec 29 10:34:54 play dhcpd: Lease for 192.168.2.193 is connected to
Test-Dslam:1/2:0.35:VLAN=1:ifIndex=1003002
Dec 29 10:34:54 play dhcpd: DHCPREQUEST for 192.168.2.193 (192.168.2.1) from
00:d0:59:3d:e7:e5 (CWPORT45) via xl0
Dec 29 10:34:54 play dhcpd: DHCPACK on 192.168.2.193 to 00:d0:59:3d:e7:e5
(CWPORT45) via xl0

So changing the subnet the dslam is on makes option 82 logging work.

Anyone have a take on why using a small /28 from 192.168.1.0/24 would not
make
option 82
logging work? But changing it to its own /24 does?

Thanks,
Keith



Patrick wrote:

-> I'm not much help. The only instance of "if exists" I see in our config
is
-> 
-> if exists agent.circuit-id
-> {
->         log ( error, concat( "Lease for ", binary-to-ascii (10, 8, ".",
leased-address), "
-> is connected to ", option agent.circuit-id)); }
-> 
-> which looks pretty similar to yours. Does it continue to fail if only one
of
the "if"
-> statements is present? Does it fail if you try to use something like what
I've
-> posted here? This one has been working for us here for years, long enough
ago
-> that I'm not the one that created it. We use option 82 quite heavily on
our
-> network, though, without issue as long as I don't blunder.


Keith Wrote:

-> My DHCP config:
-> 
-> default-lease-time 300;
-> max-lease-time 300;
-> allow bootp;
-> ddns-updates off;
-> ddns-update-style interim;
-> 
-> log-facility local7;
-> 
-> subnet 192.168.1.0 netmask 255.255.255.248 { }
-> 
-> subnet 192.168.1.192 netmask 255.255.255.240 {
-> 
-> if exists agent.circuit-id {
->   log (debug, concat("debug",option agent.circuit-id)); }
-> 
-> if exists agent.remote-id {
->   log (info, concat("option-82 info is RID: ", option agent.remote-id));
}
-> 
->         authoritative;
->         option routers 192.168.1.1;
->         range 192.168.1.193 192.168.1.206; 
 

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