Your problem is that you aren't defining a gateway address.
i've tried "route add default gw 172.21.0.1 ppp0", after which the
routing table looks thus.
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt
Iface
172.21.0.1 0.0.0.0 255.255.255.255 UH 0 0 0
ppp0
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0
eth0
0.0.0.0 172.21.0.1 0.0.0.0 UG 0 0 0
ppp0
0.0.0.0 0.0.0.0 0.0.0.0 U 0 0 0
ppp0
but i still can't ping 172.21.0.1 from a client.
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