L2TP, VPN Router

[me4uwhat]

Hi everybody,
i have got a new vpn router netgear DG834G.
There is some setting
1 What is the new Connection Name? =purevpn
2 What is the pre-shared key? =12345678
3 What is the remote WAN's IP address or Internet name? =78.129.202.33
4 What is the remote LAN IP address and Subnet Mask?
a) IP Address? =192.168.108.1
b) Subnet Mask: =255.255.255.255
i did setting but error is there
Thu, 2010-08-26 09:39:54 - added connection description "purevpn"
Thu, 2010-08-26 09:39:55 - adding interface ipsec0/ppp0 89.211.196.151:500
Thu, 2010-08-26 09:39:55 - [purevpn] initiating Main Mode
Thu, 2010-08-26 09:39:56 - [purevpn] ISAKMP SA established
Thu, 2010-08-26 09:39:56 - [purevpn] Dead Peer Detection (RFC 3706): not enabled because peer did not advertise it
Thu, 2010-08-26 09:40:06 - [purevpn] STATE_QUICK_I1: retransmission; will wait 20s for response
Thu, 2010-08-26 09:40:26 - [purevpn] STATE_QUICK_I1: retransmission; will wait 40s for response
Thu, 2010-08-26 09:41:06 - [purevpn] max number of retransmissions (2) reached STATE_QUICK_I1. No acceptable response to our first Quick Mode message: perhaps peer likes no proposal
Thu, 2010-08-26 09:41:16 - [purevpn] STATE_QUICK_I1: retransmission; will wait 20s for response

is there any one who can assis me. it will be really thankful .
Hope to get reply soon