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Author Topic: L2tp/firewall ?  (Read 1681 times)
_Lo_
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« on: July 25, 2003, 11:05:08 AM »

Hello guys,

just 2 questions : does L2TP network trafic pass a firewall? I know it can't pass a NAT because the NAT modifies the headers.

And when do we need to use PPTP instead of L2TP (apart of the NAT case)?

thanx...
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Lo
jeff_j_black
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« Reply #1 on: July 25, 2003, 11:29:16 AM »

L2TP will pass a firewall, provided the appropriate ports are configured on the firewall. The only other restriction on L2tp that I know of concerns whether or not the client has the capability for L2TP.
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_Lo_
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« Reply #2 on: July 25, 2003, 12:08:58 PM »

Quote
Originally posted by jeff_j_black
L2TP will pass a firewall, provided the appropriate ports are configured on the firewall. The only other restriction on L2tp that I know of concerns whether or not the client has the capability for L2TP.


That's what I was thinking...

Thanx (as usual JB... Wink )
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curiousgeorge
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« Reply #3 on: August 04, 2003, 04:15:33 AM »

The choice of PPTP or L2TP is a question of how you want to encrypt your data transmission.

PPTP automatically uses MPPE for encryption.

L2TP does not automatically use encryption. You must combine it with IPSec to encrypt data.

L2TP w/ IPSec is more secure than using PPTP w/ MPPE, but it is also harder to set up.
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Tarzanboy
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« Reply #4 on: August 04, 2003, 03:11:29 PM »

You can use L2TP with ESP through NAT, but you need to make certain whether the NAT router is compatible with AH, if you want to use that method.

The issue with NAT is specific to AH rather than ESP as AH protects the header, preventing the change from internal IP addressing to the external IP address and ESP doesn't.

Cheers,
TB
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