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Cisco Bug: CSCun56744 - CX: Disable Sending DHCP and RARP requests at boot

Last Modified

Feb 25, 2015

Products (1)

  • Cisco ASA Next-Generation Firewall Services

Known Affected Releases


Description (partial)

When booting an ASA CX module, the module may wait during bootup for upwards of 2-3 minutes while Sending DHCP and RARP requests. This is an unneeded step in the boot process and should be disabled.

The console logs show it spending 170 seconds to complete this task each time it boots up:

[    5.588089] input: ImExPS/2 Generic Explorer Mouse as /devices/platform/i8042/serio1/input/input2
[    6.900026] Sending DHCP and RARP requests ...<7>eth0: no IPv6 routers present
[   24.140019] ... timed out!
[   95.562857] IP-Config: Reopening network devices...
[   97.066028] Sending DHCP and RARP requests ...<7>eth1: no IPv6 routers present
[  111.632019] ... timed out!
[  176.275808] IP-Config: Auto-configuration of network failed.
[  176.276307] Freeing unused kernel memory: 536k freed

That's nearly 3 minutes of boot time waisted. For customers with 'fail-close' configured on their ASA, that could be thousands of packets and connections dropped unnecessarily.

This is seen on all current build of ASA CX code.
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