Why the NAT in the solution here? VLAN 6 users are already permitted to reach 191.1.79.100 because in task 3.1 we added an inbound permit to that host on R3. Therefore, R3's security policy is not denying the traffic. The reason the traffic is not making it is because the VL79 hosts have no route back to 10.6.6.0/24. I just added it to R6's BGP config, which caused it to get dumped into OSPF on R3 by the redistribution, and it worked fine.
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Jeff McLaughlin
CCIE #14023