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Turn off ARP-Cache Restrictions on Cisco ASA 5500 Series Version 8.4(4.5)
Traffic will not pass through the second Sharedband connection when networked to a Cisco ASA 5500 Series Version 8.4(4.5). This causes poor bonded speeds and packet loss.

The ASA ARP cache only contains entries from directly-connected subnets by default.

You can now enable the ARP cache to also include non-directly-connected subnets by setting the following command within the ASA config:

arp permit-nonconnected

(This feature is not available in 8.5(1), 8.6(1), 8.7(1), 9.0(1), or 9.1(1))
For more information please refer to Cisco article