Cannot share network connection with Roku

[DevilInPgh]

I seem to be having quite a big problem with Internet sharing. After doing a clean install of Lucid, I tried to set up a shared connection between my computer and my Roku set-top box. I have noticed that I am only able to set up a connection profile in Network Connections under the Ethernet card with the active Internet connection. That is, whenever I try to set up a connection, I am not given the option of using the second Ethernet card. Thus I can't share the network connection. Can someone PLEASE help me? The IRC has been completely useless.

[DevilInPgh]

BTTT. Was on vacation for a couple weeks. Can someone please help me?

[DevilInPgh]

BTTT again. Now problem includes trying to share Internet connection with laptop.

[Iowan]

Do both interfaces show up in (from a terminal) sudo lshw -C network?

[DevilInPgh]

Yes, both interfaces appear in the command output.

  *-network:0             
       description: Ethernet interface
       product: Gigabit Network Adapter
       vendor: Linksys
       physical id: 5
       bus info: pci@0000:00:05.0
       logical name: eth0
       version: 10
       serial: 00:18:f8:0d:13:02
       size: 10MB/s
       capacity: 1GB/s
       width: 32 bits
       clock: 66MHz
       capabilities: pm bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half latency=64 link=no maxlatency=64 mingnt=32 multicast=yes port=MII speed=10MB/s
       resources: irq:16 ioport:e800(size=256) memory:dfffff00-dfffffff memory:dffc0000-dffdffff(prefetchable)
  *-network:1
       description: Ethernet interface
       product: SMC2-1211TX
       vendor: Accton Technology Corporation
       physical id: 9
       bus info: pci@0000:00:09.0
       logical name: eth1
       version: 10
       serial: 00:e0:29:6e:76:3e
       size: 100MB/s
       capacity: 100MB/s
       width: 32 bits
       clock: 33MHz
       capabilities: pm bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=8139too driverversion=0.9.28 duplex=full ip=130.49.36.40 latency=64 link=yes maxlatency=64 mingnt=32 multicast=yes port=MII speed=100MB/s
       resources: irq:16 ioport:d800(size=256) memory:dffffd00-dffffdff

[Iowan]

Which card is available for connection profile(s)? The info you posted looks like eth1 has an IP address. Is that the one with the active Internet connection?