[LARTC] IPSec gateway configuration

[Vlad Adomnicai]

Hi,
  Indeed, PPPoE is great for this, but unfortunately, in my case I would 
prefere something else. For PPPoE all the auth stuff is easy, but if two 
clients from the same LAN try to copy from each other, they are killing 
the processor and the network card in the router instead of copying 
directly from one another via the switches. Another problem with the 
PPPoE I couldn't solve was strange disconnects of clients. I couldn't 
trace them to high cpu load or high network traffic. They simply appear 
to be random and more, when the connection crashes, I get mismatches 
between the number of pppX interfaces from ifconfig output and the 
number of interfaces that I see in /proc/net/dev.
  With the IPSec I hoped to ease some traffic from the routers and also 
decrease the cpu load. Also I hoped I could get rid of the nasty 
disconnects.

Vlad Adomnicai

Eugene Butan wrote:

>Hello Vlad,
>
>Why just not to use PPPoE between your gateways and clients?
>This way you will be sure that only authenticated clients will be given 
>Internet access.
>
>Eugene
>
>On Monday 21 March 2005 16:12, Vlad Adomnicai wrote:
>  
>
>>Hi,
>>  I'm trying to build an ipsec gateway and somewhere I'm doing something
>>wrong.
>>
>>  I have a couple of routers that have clients in their back. All the
>>routers are connected into a switch. In that switch I also have a
>>computer that provides internet access to the clients.
>>   I would like to setup some sort of autentification (don't need
>>encryption), to allow me to give access to different services to
>>clients. Diferenciating services I can do on the internet gateway, but
>>on the routers I have to be certain that a certain IP is not stolen.
>>  I have set up ipsec so that if a client pings his gateway, it will
>>work only if he has the same key as defined on the server. However, if
>>he pings the internet gateway, it will work, no matter what I do. I
>>would like the router to validate all packets to the outside LAN. Also I
>>would like to achieve this with the lowest CPU utilization possible
>>although this isn't critical. (about 150 clients behind one router
>>(p2-400/p3-600)).
>>
>>  The documentation that I have found was only how to establish secure
>>connection between two computers, but what I need is to get outside of
>>it and if possible to not use VPN, because I want the clients that are
>>in the same LAN have maximum trasnfer speeds.
>>
>>  Thx for any suggestions in advance.
>>
>>Vlad Adomnicai
>>
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