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ppp addresses and routing table

I'm experiencing some trouble with my DSL setup.
Every time after reboot my routing table is using my ppp0 P-t-P address instead of its inet address. 


$ ifconfig ppp0
ppp0 Link encap:Point-to-Point Protocol inet addr:168.100.249.107 P-t-P:168.100.250.1 Mask:255.255.255.255 
         UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1492  Metric:1
         RX packets:278715 errors:0 dropped:0 overruns:0 frame:0
         TX packets:280248 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:3
         RX bytes:155755125 (148.5 MiB)  TX bytes:67529994 (64.4 MiB)

$ route -e
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface 
168.100.250.1 *               255.255.255.255 UH        0 0          0 ppp0
192.168.2.0 * 255.255.255.0 U 0 0 0 eth0 192.168.1.0 * 255.255.255.0 U 0 0 0 eth1 
default         168.100.250.1 0.0.0.0         UG        0 0          0 ppp0

I'm not getting any Internet connection by using the P-t-P address.
Only after I delete PPP0 and default gateway route and change them manually to the PPP0 inet address I get the desired connection.
When I change the routing addresses from 168.100.250.1 to 168.100.249.107 I get: 

$ route -e
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface 249-107.custome * 255.255.255.255 UH 0 0 0 ppp0 192.168.2.0 * 255.255.255.0 U 0 0 0 eth0 192.168.1.0 * 255.255.255.0 U 0 0 0 eth1 default 249-107.custome 0.0.0.0 UG 0 0 0 ppp0 

And everything works fine from here.
Is there something with my configuration messed up and I should get a proper connection through the P-t-P address? Or is there a way to tell my system it should use the external address instead? 

Thanks for any help,
-- Bernd
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