routing with ppp

[Albert Cahalan]

I have an ethernet connection and a ppp connection.  The ethernet works
just fine, but the ppp connection will not work.  I believe I have a
routing problem.  As I have read many fine manuals and still have no
answer, I need help.

My ethernet address: 192.168.0.18 (not on the net)
My static ppp address: 198.115.180.39

The ppp link will be up once an hour to transfer mail.

>From ifconfig:
ppp0      Link encap:Point-Point Protocol
          inet addr:198.115.180.39  P-t-P:192.233.85.139  Mask:255.255.255.0
          UP POINTOPOINT RUNNING  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0
          TX packets:0 errors:0 dropped:0 overruns:0

>From netstat -i:
Kernel Interface table
Iface   MTU Met  RX-OK RX-ERR RX-DRP RX-OVR  TX-OK TX-ERR TX-DRP TX-OVR Flags
lo     2000   0      0      0      0      0    253      0      0      0 BLRU
ppp0   1500   0      0      0      0      0      0      0      0      0 PRU
eth0   1500   0    941      0      0      0    239      0      0      0 BRU

>From route:
Kernel routing table
Destination     Gateway         Genmask         Flags MSS    Window Use Iface
192.233.85.139  *               255.255.255.255 UH    1436   0        0 ppp0
ethernet        *               255.255.255.0   U     1436   0      245 eth0
loopnet         *               255.0.0.0       U     1936   0       37 lo
default         *               *               U     1436   0      359 eth0