I got a netgear one than can handle Jumbo
http://www.netgear.com/business/products/switches/unmanaged-desktop-switches/gs105.aspx
[root@freenas] ~# ifconfig
em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 9000
options=219b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,WOL_MAGIC>
ether 00:1b:21:d2:95:72
inet 192.168.0.50 netmask 0xffffff00 broadcast 192.168.0.255
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
bge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=c019b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,VLAN_HWTSO,LINKSTATE>
ether 3c:4a:92:74:2f:d0
inet 192.168.0.150 netmask 0xffffff00 broadcast 192.168.0.255
media: Ethernet autoselect (none)
status: no carrier
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
options=3<RXCSUM,TXCSUM>
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
inet6 ::1 prefixlen 128
inet 127.0.0.1 netmask 0xff000000
nd6 options=3<PERFORMNUD,ACCEPT_RTADV>