WAN UP and DOWN several times a minute

[AvdS]

Hi All,
In my system log i see my WAN interface is going down several times a minute.
Log:
Jun 22 14:57:42   kernel: igb0: link state changed to UP
Jun 22 14:57:38   kernel: igb0: link state changed to DOWN
Jun 22 14:57:37   opnsense: /usr/local/etc/rc.linkup: HOTPLUG: Configuring interface wan
Jun 22 14:57:37   opnsense: /usr/local/etc/rc.linkup: DEVD Ethernet attached event for wan
Jun 22 14:57:37   opnsense: /usr/local/etc/rc.linkup: Clearing states to old gateway 84.28.94.1.
Jun 22 14:57:37   opnsense: /usr/local/etc/rc.linkup: DEVD Ethernet detached event for wan
Jun 22 14:57:33   opnsense: /usr/local/etc/rc.linkup: ROUTING: skipping IPv6 default route
Jun 22 14:57:33   opnsense: /usr/local/etc/rc.linkup: ROUTING: keeping current default gateway '84.28.94.1'
Jun 22 14:57:33   opnsense: /usr/local/etc/rc.linkup: ROUTING: setting IPv4 default route to 84.28.94.1
Jun 22 14:57:33   opnsense: /usr/local/etc/rc.linkup: ROUTING: no IPv6 default gateway set, assuming wan
Jun 22 14:57:33   opnsense: /usr/local/etc/rc.linkup: ROUTING: IPv4 default gateway set to wan
Jun 22 14:57:33   opnsense: /usr/local/etc/rc.linkup: ROUTING: entering configure using 'wan'
Jun 22 14:57:32   opnsense: /usr/local/etc/rc.newwanip: ROUTING: skipping IPv6 default route
Jun 22 14:57:32   opnsense: /usr/local/etc/rc.newwanip: ROUTING: keeping current default gateway '84.28.94.1'
Jun 22 14:57:32   opnsense: /usr/local/etc/rc.newwanip: ROUTING: setting IPv4 default route to 84.28.94.1
Jun 22 14:57:32   opnsense: /usr/local/etc/rc.newwanip: ROUTING: no IPv6 default gateway set, assuming wan
Jun 22 14:57:32   opnsense: /usr/local/etc/rc.newwanip: ROUTING: IPv4 default gateway set to wan
Jun 22 14:57:32   opnsense: /usr/local/etc/rc.newwanip: ROUTING: entering configure using 'wan'
Jun 22 14:57:32   opnsense: /usr/local/etc/rc.newwanip: On (IP address: 84.28.94.25) (interface: WANzigo[wan]) (real interface: igb0).
Jun 22 14:57:32   opnsense: /usr/local/etc/rc.newwanip: IP renewal is starting on 'igb0'
Jun 22 14:57:31   kernel: igb0: link state changed to UP
Jun 22 14:57:27   kernel: igb0: link state changed to DOWN

I tried a lot of configurations and bios settings without succes.
If the WAN interfase is going down i have no internet acces and the led's of my wan nic is going off.
The lan interface is stable and working well.
I have a mainboard Jetway NF9HB with 4 nic's
How can i find and solve this problem.

update:
If i connect my firewall wan to my router (apple airport expres) the problem is gone.   
My wan is configured with DHCP.
How can I configurate my firewall WAN without my router?

update 2:
If i turn off Intrusion detection, problem is gone 
If i turn on Intrusion detection on my LAN (not on WAN), problem is gone 
If i turn on Intrusion detection on my WAN (not on LAN), problem is there immediatly

Is this a bug or a hardware related issue?

[hirschferkel]

Dear AvdS,

how or where did you turn of the Intrusion detection on your WAN?

Best, hirschferkel

[phoenix]

how or where did you turn of the Intrusion detection on your WAN@

That would be in Services: Intrusion Detection: Administration. Perhaps it would be a good idea to give details of your hardware and specifically the NIC device or if it's a VM and which type of hypervisor etc., etc.