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Why GRE over IPSec not L2TP over IPSec or anything else?

Hello there,

I am a newbie for Cisco VPN solution. I understood that Cisco usually uses GRE over IPSec. Why does it choose GRE for tunneling? Why doesn?t it use another tunneling protocols such L2TP like a MS?

Please advice.

Thanks in advance,

Nitass

1 REPLY

Re: Why GRE over IPSec not L2TP over IPSec or anything else?

Hi,

GRE is a generic encapsulationprotocol that support wide variety of protocol packet types inside IP tunnels, creating a virtual point-to-point link to Cisco routers at remote points over an IP internetwork. This protocol is developed by Cisco, hence, you'lll definitely see it applied everywhere, including IPSec. It depends on your requirements whether to use GRE or L2TP.

L2TP (IETF standard), on the other hand, is a combination of Cisco's Layer 2 Forwarding (L2F) protocol and Microsoft's Point-to-Point Tunneling Protocol (PPTP).

There is also L2TP over IPSec (see link below) on PIX/ASA 7.2 platform.

http://www.cisco.com/en/US/products/ps6120/products_configuration_guide_chapter09186a008066ebb6.html

http://www.cisco.com/en/US/tech/tk827/tk369/technologies_white_paper09186a00800a43e9.shtml

http://www.cisco.com/en/US/tech/tk827/tk369/technologies_q_and_a_item09186a00800a443e.shtml

Pls rate helpful post.

Rgds,

AK

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