TUNNEL

[The_guroo_2]

hi i m bit new to security......can someone plz tell me what is GRE tunnel....for that we have to make a tunnel first.....i m bit confused abt this concept....whast the dissrence between Gre and normal tunnel.....cheers and thnak sin advance

[dgahm]

IPSEC tunnels can only handle unicast traffic, while GRE tunnels can also accommodate multicast, which is required for routing protocols like EIGRP or OSPF. So if you create a GRE tunnel, and then configure IPSEC to encrypt the GRE tunnel you get around this limitation of IPSEC.

http://www.cisco.com/univercd/cc/td/doc/product/core/7100/swcg/6342gre.htm#1057710

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[spremkumar]

Hi

In addition to David's explanation GRE is a simple encapsulation technology where in IPSEC provides you enough option for going in with different encryption strengths which you or your organization prefers as a policy to safeguard all your valuable information.

regds