Packet loss over libreswan tunnel in RHEL7 when using xen virtualization

Solution Verified - Updated -

Issue

  • Packet loss (~5%) experienced with a point to point libreswan ipsec tunnel under the following conditions:
    • The 'right' side of the tunnel runs RHEL 7 (as opposed to RHEL 6)
    • The 'right' side of the tunnel is a Xen guest using xen-netfront NIC (identified problem in amazon aws ec2 env.)
    • Packet loss is only seen when the 'left' side tries to reach a third host on the 'right' subnet via the tunnel (if the 'left' side talks directly to the 'right', there is no loss seen)
    • If the 'right' side runs RHEL 7 but with a different NIC type (Intel SR-IOV, for example), the problem is not seen.

Environment

  • Red Hat Enterprise Linux 7
  • xen-netfront (vif) module

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