I have a 2801 router. Using FE0/0 for outside, using FE0/1 for inside. We added another provider who is giving us a CAT5 handoff (Bringing fiber into our premise, then they have a 3750, we will hook into 3750). I looked for a network module and found this one-Cisco Etherswitch 4, but the interfaces can't be assigned an IP...do they have a FE interface WIC card..the 2801 doesn't support any network modules...
As you've noted in your original post, the 2801 doesn't support any network modules, which eliminates the various Ethernet modules.
Paolo's reference to the HWIC-1FE satisfies your requirement, don't miss to consider "Note: For the HWIC-1FE and HWIC-2FE the minimum level is Cisco IOS 12.4(15)T."
With regard to using an external switch and VLAN trunks to the router, you wouldn't necessary have to deploy another switch, depending on the cooperation of the provider with the 3750, it might be done there, or it might be done on whatever switches your two interfaces currently connect to.
One last consideration, a 2801 doesn't really have the performance capacity to sustain 100 Mbps full duplex. Depending on the bandwidth of the existing external path, and what the new and additional external path bandwidth might also add, the 2801 might be overwhelmed. Besides having the option to upgrade to a faster router, depending on your feature needs, keep in mind one of the L3 switches might be a better choice.
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