Re: a question

kchen,

I'd encourage your to send L2TP tunnel switching related questions to L2TP
list, because this is the right forum for such discussions. my response
inline..

--- kchen <kchen <at> seu.edu.cn> wrote:
> Hi,I have a question to ask you.
> [L2] <--- PPP ---> [LAC] <---L2TP --> [ TSA ] <--- PPTP---> [LNS]
> In such a example,the TSA should dencrypt the packet from LAC and encrypt it
> to LNS,is it?if this is true,I think the TSA is a bottleneck.
you are correct, TSA would be bottleneck specially if encryption and decription
is done in software;
In general, if one uses TSA that can't handle traffic (control as well as data)
from multiple LACs then there is some problem in the network delpoyment.

> [L2] <--- PPP ---> [LAC] <---L2TP --> [ TSA ] <--- L2TP---> [LNS]
> In this situation,the tunnel beside the TSA are both L2TP.The packet is
> forward to LNS directly.Is it true?
nope.. the packet needs to switch the session and tunnel so it can't be
forwarded directo to the LNS; It must be destined to TSA's tunnel IP address,
which could decide to tunnel the session or drop it depending on configured
policies.

thanks,
-- vipin

> Thank you fore you help.
>