Cannot determine ethernet address for proxy

["a" <huixf@tonghua.com.cn>]

i am hooking up ISP. Below is part of output of plog:

....
Jul 27 00:18:52 debian chat[668]: expect (word)
Jul 27 00:18:52 debian chat[668]: vip^M
Jul 27 00:18:52 debian chat[668]: Password -- got it
Jul 27 00:18:52 debian chat[668]: send (vip^M)
Jul 27 00:18:52 debian pppd[667]: Serial connection established.
Jul 27 00:18:53 debian pppd[667]: Using interface ppp0
Jul 27 00:18:53 debian pppd[667]: Connect: ppp0 <--> /dev/cua2
Jul 27 00:18:55 debian pppd[667]: local  IP address 202.109.38.24
Jul 27 00:18:55 debian pppd[667]: remote IP address 202.109.14.77
Jul 27 00:18:55 debian pppd[667]: Cannot determine ethernet address for proxy  ARP

The last line seems to indicate error. How to fix it? 

Please reply to huixf@tonghua.com.cn because I will leave the list in a minute.

PS: My ISP uses both "login:" and "Username:" in login. How to "expect" both in chatscript. Currently my script expects ":".