What is the RPM for the Cisco client ? That and Quickbooks (used by my accountant) are the only things still keeping me on Microsoft.
Personally, I have found that VPNC works better than Cisco's own client. It should be part of your distribution. Try "yum install vpnc". You run a script against your Cisco vpn config file to convert it to vpnc format.
By the way, QuickBooks will run under Crossover Office. In fact, the company that builds and sells Crossover Office uses QuickBooks internally running under their own product.