![]() ![]() ![]() When a payload IPv4 packet that needs to be forwarded into the tunnel is larger than M bytes the payload packet is IP fragmented (prior to tunnel encapsulation) if the DF bit is clear, otherwise the packet is discarded. This sets the maximum payload IP packet size (including IP header) that can be sent into the tunnel – for example, it applies to the packet size before the tunnel encapsulation is added. ![]() It is possible to configure the IP MTU (M) of a private tunnel SAP interface. An IP interface associated with a private tunnel SAP does not support unnumbered operation. This address belongs to the address space of the VPRN 1 service and will not be exposed to the public IP network carrying the GRE encapsulated packets. In the configuration example of the previous section the IP address 10.0.0.1 is the address of the GRE tunnel endpoint from the perspective of payload IP packets. The ISA provides a variety of encryption features required to establish bi-directional IPsec tunnels including: In this way, the authenticity/confidentiality/integrity of accessing the private network can be enforced.If authentication and confidentiality are not important then access to the private network may alternatively be provided through GRE or IP-IP tunnels. Traffic from the public network may need to be authenticated and encrypted inside an IPsec tunnel to reach the private network. The public and private services are typically two different services, and the ISA is the only “bridge” between the two. Inside the 7750 SR, a public service instance (IES or VPRN) connects to the public network and a private service instance (typically a VPRN) connects to the private network. 7750 SR IPsec Implementation Architectureįigure 34, the public network is typically an “insecure network” (for example, the public Internet) over which packets belonging to the private network in the diagram cannot be transmitted natively. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
December 2022
Categories |