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Problem with LAN->WAN on 1811

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I'm having an issue with a 1811 router that was working perfectly fine
before today, but now does not allow traffic to leave the LAN and enter
the WAN.

All hosts on the LAN side can see each other and the router's vlan1
interface, which is on the same subnet.
None of the hosts can see the router's Fastethernet0 interface, which
is our WAN connected to the internet. Even hosts set to use this
router as their gateway cannot even ping the router's WAN address.

The router has no problem pinging hosts on the internet or on the local
The problem must therefore be in the router's configuration.
The thing is, though, that it looks perfectly fine to me.

Any thoughts?

Here's a bit of the config from the router:

interface FastEthernet0
description Internet 1$FW_OUTSIDE$$ES_WAN$$ETH-WAN$
ip address
ip verify unicast reverse-path
ip mask-reply
no ip proxy-arp
ip nbar protocol-discovery
ip flow ingress
ip flow egress
ip nat outside
ip ips sdm_ips_rule in
ip virtual-reassembly
ip route-cache flow
duplex auto
speed auto
interface FastEthernet8
description Internal LAN 1
interface Vlan1
ip address
ip mask-reply
ip nbar protocol-discovery
ip flow ingress
ip flow egress
ip nat inside
ip virtual-reassembly
ip route-cache flow
ip tcp adjust-mss 1452
ip route permanent
ip route Vlan1

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