![]() It is clear NAT and IPsec are incompatible with each other, and to resolve this issue, NAT Traversal was developed. The NAT device in the middle breaks the authenticity, integrity and in some cases cannot do anything at all with the packet. The NAT device cannot change these encrypted headers to its own addresses, nor do anything with them. So when the NAT device alters the packet, its integrity and authentication will fail.Īlso in some cases, depending on the level of encryption, the payload and in particular the headers are encrypted when using IPsec ESP mode. This means breaking the authenticity which will cause the packet by the remote peer to be dropped. Now the problem is when a NAT device does its NAT translations, the embedded address of the source computer within the IP payload does not match the source address of the IKE packet as it is replaced by the address of the NAT device. This is usually the case if your ISP is doing NAT, or the external interface of your firewall is connected to a device that has NAT enabled.Īs well as IPsec providing confidentiality, it also provides authenticity and integrity. Nat Traversal, also known as UDP encapsulation, allows traffic to get to the specified destination when a device does not have a public IP address. ![]()
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