gns3 > gear...

and here we have it...

i'll get all slick rick on it later... first is proving connectivity... the guidance for linux is to use the generic eth interface v. the linux one...

r1#sh cdp neigh
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
3550-01.ozlan    Fas 0/0           127             R S I  WS-C3550- Fas 0/1

this is the entre' to the wire; the 3550...

r1#sh arp
Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Internet  10.1.1.1                7   a8b1.d4d3.a941  ARPA   FastEthernet0/0
Internet  10.1.1.11               8   0009.b752.d780  ARPA   FastEthernet0/0
Internet  10.1.1.12               7   0009.b73f.ce80  ARPA   FastEthernet0/0
Internet  10.1.1.100              9   000f.8ffe.0980  ARPA   FastEthernet0/0
Internet  10.1.1.101              -   ca00.0d67.0008  ARPA   FastEthernet0/0

1.100 is the 3550, 1.1 is the 3560, 1.11 and .12 are the 2950's and 1.101 is the gns3 router...

also running as root is advised, sudo gns3... qinq is next to make the 3550 invisible...