Two adapters, routing problems

I have AT&T U-Verse as my provider at home, and their gateway device
has a configuration where all incoming traffic can be directed at a
system inside the network. The problem is that this system's IP
address must be assigned through DHCP and must be dynamic. But this
makes it hard for systems inside the network to keep track of that
address.

Some services I want to make available externally, some I'd like to
keep internal. (Apache I have bound to the external address, squid I
have bound to the internal static address, etc..)

So to fix this, I installed two adapters in the system, and they're
configured like this in /etc/network/interfaces:

auto eth0
iface eth0 inet static
hwaddress ether 00:C0:4F:72:E1:FF
address 192.168.1.13
netmask 255.255.255.0
network 192.168.1.0
broadcast 192.168.1.255
gateway 192.168.1.254
auto eth1
iface eth1 inet dhcp

The routing table that comes up is now:

Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref
Use Iface
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0
0 eth0
99.13.8.0 0.0.0.0 255.255.252.0 U 0 0
0 eth1
0.0.0.0 99.13.8.1 0.0.0.0 UG 0 0
0 eth1
0.0.0.0 192.168.1.254 0.0.0.0 UG 0 0
0 eth0

Which seems fishy and doesn't work well. Connections from the outside
are coming in just fine (on the 99.13.* address). However,
connections originating on the internal network (like on the box
itself) aren't able to connect to the outside world.

What am I missing here?
.

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