Encountered problem when using pptp in Linux

I tried to use pptp in Ubuntu 10.10 and encountered the following error (ip address, username, and password have been omitted)

sudo pptpsetup --create vpn --server

XXX --username XXX --password XXX

--start Using interface ppp0 Connect: ppp0 <--> /dev/pts/1 CHAP

authentication s开发者_开发知识库ucceeded Cannot

determine ethernet address for proxy

ARP local IP address XXX remote IP

address XXX

Could anyone figure out why?

Are you sure that is an error?

From the known working log:

...
rcvd [IPCP ConfAck id=0x3 <addr 168.192.232.42>]
Cannot determine ethernet address for proxy ARP
local IP address 168.192.232.42
remote IP address 168.192.232.31
...