353
Output: 0 packets, 0 bytes, 0 drops
# Display tunnel interface information on Router B.
[RouterB] display interface tunnel 0
Tunnel0
Current state: UP
Line protocol state: UP
Description: Tunnel0 Interface
Bandwidth: 64kbps
Maximum Transmit Unit: 1476
Internet Address is 10.1.2.2/24 Primary
Tunnel source 2.2.2.2, destination 1.1.1.1
Tunnel keepalive disabled
Tunnel TTL 255
Tunnel protocol/transport GRE/IP
GRE key disabled
Checksumming of GRE packets disabled
Output queue - Urgent queuing: Size/Length/Discards 0/100/0
Output queue - Protocol queuing: Size/Length/Discards 0/500/0
Output queue - FIFO queuing: Size/Length/Discards 0/75/0
Last clearing of counters: Never
Last 300 seconds input rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec
Last 300 seconds output rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec
Input: 0 packets, 0 bytes, 0 drops
Output: 0 packets, 0 bytes, 0 drops
# From Router B, ping the IP address of GigabitEthernet 1/0/1 on Router A.
[RouterB] ping -a 10.1.3.1 10.1.1.1
Ping 10.1.1.1 (10.1.1.1) from 10.1.3.1: 56 data bytes, press CTRL_C to break
56 bytes from 10.1.1.1: icmp_seq=0 ttl=255 time=11.000 ms
56 bytes from 10.1.1.1: icmp_seq=1 ttl=255 time=1.000 ms
56 bytes from 10.1.1.1: icmp_seq=2 ttl=255 time=0.000 ms
56 bytes from 10.1.1.1: icmp_seq=3 ttl=255 time=0.000 ms
56 bytes from 10.1.1.1: icmp_seq=4 ttl=255 time=0.000 ms
--- Ping statistics for 10.1.1.1 ---
5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss
round-trip min/avg/max/std-dev = 0.000/2.400/11.000/4.317 ms
The output shows that Router B can successfully ping Router A.
Configuring an IPv4 over IPv6 GRE tunnel
Network requirements
As shown in Figure 140, two IPv4 subnets Group 1 and Group 2 are connected to an IPv6 network.
Create a GRE/IPv6 tunnel between Router A and Router B, so the two IPv4 subnets can
communicate with each other through the GRE tunnel over the IPv6 network.
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