Difference between IPSec over TCP and UDP IPsecover

Hello world

I'm testing the VPN to the user's PC.

When I test the PC of the user using IPsecoverTCP it uses protocol 10000.

When I check on ASA - ASDM under connection details

ike1 - UDP Destination Port 500

IPsecOverTCP TCP Dst Port 10000

using Ipsecover UDP

IKEv1 - Destination UDP 500 Port

IPsecOverUDP - Port of Destination UDP Tunnel 10000

Therefore when using TCP or UDP uses the same port 500 and 10000.

Is need to know what is the major difference between these two connections just TCP or UDP?

Concerning

MAhesh

IPSec over TCP is used in scenarios where:

1 UDP port 500 is blocked, resulting in incomplete IKE negotiations

2 ESP is not allowed to cross and encrypted traffic thus do not cross.

3. network administrator prefers to use a connection oriented protocol.

4. IPSec over TCP may be necessary when the intermediate NAT or PAT device is stateful firewall.

As there are IPSec over UDP with IPSec over TCP, there is no room for negotiation. IPSec on the TCP packets are encapsulated from the beginning of the cycle of implementation of the tunnel. This feature is available only for remote access VPN not for tunnel L2L. Also does not work with proxy firewall.

While IPSec via UDP, similar to NAT - T, is used to encapsulate ESP packets using a UDP wrapper. Useful in scenarios where the VPN clients don't support NAT - T and are behind a firewall that does not allow the ESP packets to pass through. IN IPSec over UDP, the IKE negotiations has always use port UDP 500.

Tags: Cisco Security

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