No external network connectivity, NAT or bridging

I'm having trouble with network connectivity on a Fedora Core 4 host with Fedora Core 5 guests.

VMWare Server seemed to install normally on the host, and I ran vmware-config and enabled all three networking options.

In both NAT and Bridging mode, the guest and host can connect to each other, but the guests cannot connect to the network beyond the host. When I try to ping from the NAT or bridging guest to the outside world, I get "Destination Host Unreachable".

It seems to me that, since routes are configured properly on the Guest, and the Guest can communicate with the Host, it must be a configuration issue on the host? Does anybody have suggestions on how to fix this?

The bridging Guest is a FC5 VM which runs perfectly well on another server. I build a separate FC5 freshly-installed VM to test NAT, to see if it was a problem with my Guest. I had the exact same results with the second Guest.

Thanks in advance!

Here's the network configuration on the bridging guest:

\[root@guest ~]# ifconfig

eth0      Link encap:Ethernet  HWaddr 00:0C:29:xx:xx:xx

          inet addr:208.x.y.229  Bcast:208.x.y.255  Mask:255.255.255.0

...

\[root@guest ~]# route -n

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

208.x.y.0   0.0.0.0               255.255.255.0   U     0      0        0 eth0

169.254.0.0     0.0.0.0               255.255.0.0     U     0      0        0 eth0

0.0.0.0         208.x.y.254 0.0.0.0         UG    0      0        0 eth0

And here's the Host configuration:

\[root@host ~]# /sbin/ifconfig

eth0      Link encap:Ethernet  HWaddr 00:30:1B:xx:xx:xx

          inet addr:208.x.y.226  Bcast:208.x.y.255  Mask:255.255.255.0

...

vmnet1    Link encap:Ethernet  HWaddr 00:50:56:xx:xx:xx

          inet addr:192.168.127.1  Bcast:192.168.127.255  Mask:255.255.255.0

...

vmnet8    Link encap:Ethernet  HWaddr 00:50:56:xx:xx:xx

          inet addr:192.168.160.1  Bcast:192.168.160.255  Mask:255.255.255.0

\[root@host ~]# /sbin/route -n

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

192.168.160.0   0.0.0.0         255.255.255.0   U     0      0        0 vmnet8

208.x.y.0   0.0.0.0         255.255.255.0   U     0      0        0 eth0

192.168.127.0   0.0.0.0         255.255.255.0   U     0      0        0 vmnet1

169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0 eth0

0.0.0.0         208.x.y.254 0.0.0.0         UG    0      0        0 eth0