Outgoing NAT failure

  • Hi,

    I have two pfSense (2.0RC1 built on Sat Feb 26 18:07:23 EST 2011  ) boxes in failover mode. The WAN IP address has been set as a Carp IP address and everything works fine when you browse the internet.

    Until you try to do a download.

    When downloading a file, after a while, it stalls. On the LAN side, with a tcpdump I can see that the server on the internet just stopped sending packets.

    On the WAN side, with the capture I see that suddenly pfSense stops passing data back to the LAN client and starts sending packets like the following one to the internet server:

    8:13:54.058314 IP > pub4.kernel.org: ICMP host unreachable, length 60

    ( is my WAN IP addres, which I edited for privacy reasons). This example is when downloading a kernel source tarball from kernel.org.

    Everything points that, after a while (something running periodically?) the state of the connection is lost and pfSense for some reason can't recognize the CARP ip as a valid ip address.

    Any help will be appreciated.

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