It seems there is some issue with domain-based dynamic split-routing support in the Linux.
In OS X, the routing table contains the routes added by dynamically resolving a domain name to an external IP address. In Linux, the routing table only contains the "static" routes (those set via X-CSTP-Split-Include).
The dynamic split tunneling feature is described here: https://www.cisco.com/c/en/us/td/docs/security/asa/asa98/asdm78/vpn/asdm-78-vpn-config/vpn-asdm-setup.html#task_ydq_tbw_tz
When doing --verbose here's where the domains are set:
<custom-attr>
<dynamic-split-include-domains>
<![CDATA[example.com,]]></dynamic-split-include-domains>
</custom-attr>
It was introduced in the version 4.6
