If lease time for DHCP is set to “unlimited”, it may cause DHCP client to crash.
On SRX Series devices, DHCP service might crash when it receives a DHCP offer containing a large lease value.
This issue affects all SRX platforms and might occur if following conditions are met:
*Configure an interface as a DHCP client on the SRX device
*SRX receives DHCP offer messages containing a large lease value (e.g. the lease value is greater than or equal to 230000000 seconds)
DHCP service crashes when it receives a DHCP offer containing a large lease value; persistently receiving this kind of DHCP offer will cause the DHCP service thrashing and not restarted. There is no coredump file generated. And the below log shows in messages log:
init: dhcp is thrashing, not restarted
Executing the command “show system services dhcp client” will show the dhcp subsystem stopped:
user@srx> show system services dhcp client
error: the dhcp subsystem is not running
Note: Configuring both dhcpd and jdhcpd together is not allowed.
1) Configure the lease value to a short time that is less than 230000000 seconds on the DHCP server.
2) If the SRX device runs on 12.1X44-D10 or later releases, configure JDHCPD client instead of DHCP client on the DHCP client to solve the issue.
Refer example below:
user@srx# delete interfaces * unit * family inet dhcp
user@srx# set interfaces * unit * family inet dhcp-client