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connection time-out over LT2TP VPDN connection

I have got packets lost about 5 packets or more continous over L2TP VPDN connection when I ping (at 32bytes packet size ) from a PC that connects over L2TP to LNS ip address at ethernet, loopback or WAN. On the same time, I have got NO packet lost on another PC that connects over PPP to LAC (RAS) when ping to the same LNS ip address.

Here is network diagram.


For LAC I use C3660 IOS 12.1(5) T8 , LNS is C1750 IOS 12.1 (10a)

Thank you.


Re: connection time-out over LT2TP VPDN connection

Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you. If you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center ( or speak with a TAC engineer. You can open a TAC case online at

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.