olePigeon said:

Ugh.  I've had a lot of issues with ethernet cards and the SE/30.  Even when I had the actual software disk, I couldn't get them to work by just installing the card and drivers.  The only way I could get them to work is to do a clean install of System 7 with ALL the network options selected.

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The Network Software Installer (NSI) disk should fix that more easily. It'll provide the latest versions of Appletalk and EtherTalk (ie LocalTalk and Ethernet drivers), on which to install the vendor driver if it is not present. Always install the vendor driver; the Apple driver is generic and may not enable cache RAM. The NSI supports System 6 to 7.1ish; later versions of System 7 incorporated the NSI.

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MacTCP is not fully loaded on boot. It is fully loaded after you run a TCP/IP application. 

If you try to ping a freshly booted Mac with MacTCP, it will not respond. If you run Telnet or Netscape, MacTCP will kick in and respond to ping.

Open Transport is fully loaded on boot.