The set log_txn_id command enables or disables the display of DHCP transaction IDs in syslog messages. By default, DHCP transaction ID logging is enabled. When you enable DHCP transaction ID logging, the appliance displays transaction IDs for the following packets:

DHCPDISCOVER
DHCPREQUEST
DHCPRELEASE
DHCPDECLINE
DHCPINFORM

In Grid Manager, the transaction IDs are appended to the end of the corresponding syslog messages with a prefix of "TransID." You can view this information in the Administrator tab -> Logs tab -> Syslog tab of Grid Manager.
When you enable this feature, you must restart DHCP service for the feature to take effect. When you disable this feature, you must perform a force restart services for the change to take effect. Use the show log_txn_id to display the current status of DHCP transaction ID logging.

Syntax

set log_txn_id (ON|OFF)

Argument	Description
ON	Enables DHCP transaction ID logging on an appliance.
OFF	Disables DHCP transaction ID logging on an appliance.

Example

Enable DHCP transaction ID logging on an appliance

Infoblox > set log_txn_id ON
DHCP Transaction id logging turned ON
DHCP force restart services is required in order for the changed value to take effect

Disable DHCP transaction ID logging on an appliance

Infoblox > set log_txn_id OFF
DHCP Transaction id logging turned OFF
DHCP force restart services is required in order for the changed value to take effect

Sample syslog messages in the Syslog tab of Grid Manager:

When DHCP transaction ID logging is on:

2013-03-25T09:39:41+00:00 daemon (none) dhcpd[14434]: info DHCPINFORM from 10.0.0.199 via 10.120.20.182 TransID 78563412: not authoritative for subnet 10.0.0.0 2013-03-25T09:39:36+00:00 daemon (none) dhcpd[14434]: info DHCPDISCOVER from cc:bb:cc:dd:ee:ff via 10.120.20.182 TransID 78563412

When DHCP transaction ID logging is off:

2013-03-25T09:39:39+00:00 daemon (none) dhcpd[14434]: info DHCPREQUEST for 10.0.0.199 from cc:bb:cc:dd:ee:ff (dhcp-10-0-0-199) via 10.120.20.182