the remote site: version 12.1 hostname zzzz enable secret abcd ip address-pool local username root password root ! interface serial 1 physical-layer async ip unnembered fastethernet 0/0 async default routing async mode interacive ppp authentication pap ip route 188.199.0.0 255.255.0.0 10.10.10.2 ip classless ! Line 1 Autoselect during-login Autoselect ppp Login local Modem inout Modem autoconfigure discovery Transport input all Stopbits 1 Speed 38400 Line aux Line vty 0 4 Password cisco Login ! End ************************* the local site: interface s 0 backup interface async 3 backup delay 30 60 interface async 3 ip address 172.16.0.10 255.255.0.0(is there should be ip unnum fasteth 0 or ip unnum s 0?) encap ppp async dyna routing async mode interactive dialer in-band dialer string 5600232 ! chat-script bohao "" "atdt 5600232" TIMEOUT 60 "CONNECT" chat-script auth username root password root line aux 0 Modem inout Modem autoconfigure discovery Transport input all Stopbits 1 Speed 38400 ******************************************************* now I want to know: 1.is this chat-script "chat-script auth username root password root" right? 2.how can i make Aux use the chat-script when ddn down? 3.how can I let the remote site know my username is root and password is root? 4.what more should I do,then,after the s 0(ddn) is down,the local site will dial to the remote site automately? thanx _________________________________ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]