Contents
- 1 What do the tunnel source and tunnel destination addresses on the tunnel interface refer to in GRE configuration?
- 2 What are two benefits of using an IPsec GRE tunnel choose two select one or more a it supports the use of dynamic crypto maps to reduce configuration complexity B it allows dynamic routing protocol to run over the tunnel interface C it allows IP Multicast?
- 3 What does GRE tunnel source and destination mean?
- 4 How are keepalives used on the GRE tunnel interface?
What do the tunnel source and tunnel destination addresses on the tunnel interface refer to in GRE configuration?
tunnel mode gre ip The tunnel source and tunnel destination commands reference the IP addresses of the preconfigured physical interfaces. The ip address command on the tunnel interfaces refers to an IP network (usually a private IP network) specifically selected for the purposes of the GRE tunnel.
What are two benefits of using an IPsec GRE tunnel choose two select one or more a it supports the use of dynamic crypto maps to reduce configuration complexity B it allows dynamic routing protocol to run over the tunnel interface C it allows IP Multicast?
It allows dynamic routing protocol to run over the tunnel interface. It has less overhead than running IPsec in tunnel mode. It allows IP multicast traffic. It requires a more restrictive crypto ACL to provide finer security control.
How do you check if GRE tunnel is up?
To display GRE tunneling Information, use the following commands:
- show ip interface.
- show ip route.
- show ip interface tunnel.
- show ip tunnel traffic.
- show interface tunnel.
- show statistics tunnel.
Is GRE a UDP?
The single path GRE in UDP specification distinguishes the IP address used for the identification of the Application (i.e. the Socket ID) and the identification of the physical interface by introducing a tunnel interface: the IP address of the tunnel interface is used by the Application (Tunnel) which is different from …
What does GRE tunnel source and destination mean?
a GRE tunnel interface is an envelope a way to encapsulate some traffic inside an external IP packet that uses tunnel source and tunnel destination So when a packet is received the router to extract the internal traffic looks like on its configured tunnels.
How are keepalives used on the GRE tunnel interface?
Keepalives on the GRE tunnel interface are used in order to solve this issue in the same way keepalives are used on physical interfaces. With Cisco IOS ® Software Release 12.2(8)T, it is possible to configure keepalives on a P2P GRE tunnel interface.
How does GRE work in IPsec tunnel mode?
If you are doing the GRE over IPsec and IPsec in tunnel mode, you need first to consider the order of encapsulation. A packet will first be GRE-encapsulated and it gets a new IP header whose sender and recipient will be set according to the “tunnel source” and “tunnel destination” commands.
How is GRE used as a transport protocol?
GRE can use IPv4 as the transport protocol to tunnel an IPv6 packet across the underlying network infrastructure. GRE can use IPv6 as the transport protocol to tunnel an IPv4 packet across the underlying network infrastructure. GRE can use IPv6 as the transport protocol to tunnel an IPv6 packet across the underlying network infrastructure.