What is the difference between gre and ipsec tunnel

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Back to Cisco Routers Section. Deal with bandwidth spikes Free Download. Web Vulnerability Scanner Free Download. Network Security Scan Download Now. When configuring the IPSec transform set, no other configuration commands are required to enable tunnel mode: R1 config crypto ipsec transform-set TS esp-3des esp-md5-hmac. R1 config crypto ipsec transform-set TS esp-3des esp-md5-hmac R1 cfg-crypto-trans mode transport.

Articles To Read Next:. Cisco Router 'User Exec' Mode. Cisco Router Modes. Cisco Router Password Recovery. Agree Conwyn. IPSec can also do only authentication using AH. IPSec is an open standard that has lot of algorithms in it. So guys can u pls shed some light on the difference between gre over ipsec and ipsec over gre in a vpn implementation based scenario.

Crypto map based IPSec connection can't carry broadcast or multicast traffic. Does it mean IPsec is on the track of security? As per my knowledge, Content of GRE packets are visible to. I heard it from so many peoples that we can not trace or monitor. What is packet? How can i see information of packet. I have some query which is related to this forum:. Plz give me simple example. Here is an IPsec packet captured from the network as the packet it traveled between the VPN gateways of Anyone eavesdropping on this packet wouldn't be able to tell if the contents included encapsulated GRE, IPX, AppleTalk, IPv6, etc because it is all encapsulated and encrypted unless the eavesdropper also had the keying information to decrypt the packet.

Can you please solve my question 1 confusion? Multicast relies on routing, running RPF checks, determining outgoing interfaces and so forth. Due to the lack of a new IP subnet that match the IPsec tunnel, that is what causes the multicast on its own to not be implemented with IPsec.

There are likely other reasons as well, but that is what comes to mind. It seems that the top IP header between the tunnel endpoints creates the "addressable interfaces" necessary to propagate the multicast traffic.

The question is which one appears as the "outer" header. Lets take the case of a simple GRE tunnel. Like so:. To do that we, we need to add the crypto map to the tunnel interface whose interesting access-list will be having ip traffic not GRE.

Is this true? I have used AH, so that we can see the actuall values in wireshark. Ok, thank you. That clears it up.