I've having the same problem.
I had to add a route to the Debian appliance to make the connections in GNS3. Now I can make cable connections in GNS3 without any errors, but when I try to ping from an IOU device, to a non-IOU device, no traffic passes.
I get all green lights in GNS3
Also, if I remove the IOU1 switch, and put a generic GNS3 Ethernet Switch in it's place, the traffic passes right through.
R1, Vlan100, and Vlan200 are all Dynamips routers. "Switch" is the IOU1 L2 device.
Topology Summary: IOU1 Eth0/1 connected to Vlan100 on port Fa0/0 Eth0/2 connected to Vlan200 on port Fa0/0 Eth0/3 connected to R1 on port Fa0/0
R1 Fa0/0 connected to IOU1 on port Eth0/3 Fa0/1 connected to Cloud1 on port nio_...
Vlan100 Fa0/0 connected to IOU1 on port Eth0/1
Vlan200 Fa0/0 connected to IOU1 on port Eth0/2
Switch#show ip int brief Interface IP-Address OK? Method Status Protocol Ethernet0/0 unassigned YES unset up up Ethernet0/1 unassigned YES unset up up Ethernet0/2 unassigned YES unset up up Ethernet0/3 unassigned YES unset up up Switch# Switch# Switch# Switch# Switch#show cdp nei Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone, D - Remote, C - CVTA, M - Two-port Mac Relay
Device ID Local Intrfce Holdtme Capability Platform Port ID Switch# Switch# Switch# Switch# Switch#show mac address-table Mac Address Table -------------------------------------------
Vlan Mac Address Type Ports ---- ----------- -------- ----- Switch# Switch# Switch#
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