I picked up some Netgear ethernet cards that were free after rebate.  Now I
know why...

There is PR 12014 that describes others trouble.

The Netgear FA311 card works fine under Windows.  But under NetBSD, UDP
seems OK but TCP fails.  It seems packets received are duplicated.

Is anyone already working on a fix to this?

I found a document (http://www.national.com/ds/DP/DP83815.pdf) for the
chip.  Is that all the documentation that I need?  Or could Netgear have
something specific?

sip0 at pci0 dev 18 function 0: NatSemi DP83815 10/100 Ethernet
sip0: interrupting at irq 14
sip0: Ethernet address 81:8e:3f:56:98:a8
ukphy0 at sip0 phy 0: Generic IEEE 802.3u media interface
ukphy0: OUI 0x080017, model 0x0002, rev. 1
ukphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto

64 bytes from 10.176.108.147: icmp_seq=0 ttl=255 time=0.576 ms
64 bytes from 10.176.108.147: icmp_seq=0 DUP! ttl=254 time=1.898 ms
64 bytes from 10.176.108.147: icmp_seq=1 ttl=255 time=0.621 ms
64 bytes from 10.176.108.147: icmp_seq=1 DUP! ttl=254 time=1.793 ms

sip0:  flags=fbff<UP, BROADCAST,DEBUG, LOOPBACK, POINTOPOINT, NOTRAILERS,
RUNNING, NOARP, PROMISC, ALLMULTI, SIMPLEX, LINK0, LINK1, LINK2, MULTICAST>
mtu 1500
	media: Ethernet autoselect (100baseTX full-duplex)
	status: active
	inet 10.176.108.154 -> 10.176.108.159 netmask 0xfffffff0 broadcast
10.176.108.159
	inet6 fe80::1%sip0 -> :: prefixlen 64 scopeid 0x1
	inet6 ::1 -> ::1 prefixlen 128