You will need an extra ethernet card, or one having two separate
channels. AFAIK Ubuntu will detect this.

If there was an extra ethernet channel on the motherboard, you might
have to enable this in the CMOS.

I noticed in one of your other postings, that you are using a router.
If this is correct, you probably wouldn't need an eth1. All other
ethernet connections would go to the router.

> IIRC?

This means 'If I recall correctly' ie. a slight doubt in the
information. Similarly AFAIK means 'As far as I know'