Manual IPv6 tunneling

R3----------36.1.1.0/24-------R6--------46.1.1.0/24---------R4================================================== hostname r3interface Tunnel0ipv6 address 3FFE:A1:A2:A3::3/127tunnel source 36.1.1.3tunnel destination 46.1.1.4tunnel mode ipv6ip!interface FastEthernet0/0ip address 36.1.1.3 255.255.255.0router ospf 1network 36.1.1.0 0.0.0.255 area 10-------------------------------------------------------------r3#ping ipv6 3ffe:a1:a2:a3::2Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 3FFE:A1:A2:A3::2, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 0/3/4 ms--------------------------------------------------------------r3#sh ipv6 int brieFastEthernet0/0 [up/up]unassignedSerial0/0 [administratively down/down]unassignedBRI0/0 [administratively down/down]unassignedBRI0/0:1 [administratively down/down]unassignedBRI0/0:2 [administratively down/down]unassignedSerial0/1 [administratively down/down]unassignedTunnel0 [up/up]FE80::2401:1033FFE:A1:A2:A3::3================================================== hostname r4interface Tunnel0ipv6 address 3FFE:A1:A2:A3::2/127tunnel source 46.1.1.4tunnel destination 36.1.1.3tunnel mode ipv6ip!interface Ethernet0/0ip address 46.1.1.4 255.255.255.0router ospf 1nework 46.1.1.0 0.0.0.255 area 10r4#sh ip routeCodes: C - connected, S - static, R - RIP, M - mobile, B - BGPD - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2E1 - OSPF external type 1, E2 - OSPF external type 2i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2ia - IS-IS inter area, * - candidate default, U - per-user static routeo - ODR, P - periodic downloaded static routeGateway of last resort is not set36.0.0.0/24 is subnetted, 1 subnetsO 36.1.1.0 [110/20] via 46.1.1.6, 00:25:16, Ethernet0/046.0.0.0/24 is subnetted, 1 subnetsC 46.1.1.0 is directly connected, Ethernet0/0r4#r4#sh int tu0Tunnel0 is up, line protocol is up Hardware is TunnelMTU 1514 bytes, BW 9 Kbit, DLY 500000 usec, reliability 255/255, txload 1/255, rxload 1/255Encapsulation TUNNEL, loopback not setKeepalive not setTunnel source 46.1.1.4, destination 36.1.1.3Tunnel protocol/transport IPv6/IP, key disabled, sequencing disabledTunnel TTL 255Checksumming of packets disabled, fast tunneling enabledLast input 00:01:22, output 00:01:22, output hang neverLast clearing of "show interface" counters neverInput queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0Queueing strategy: fifoOutput queue: 0/0 (size/max)5 minute input rate 0 bits/sec, 0 packets/sec5 minute output rate 0 bits/sec, 0 packets/sec5 packets input, 700 bytes, 0 no bufferReceived 0 broadcasts, 0 runts, 0 giants, 0 throttles0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort17 packets output, 1624 bytes, 0 underruns0 output errors, 0 collisions, 0 interface resets0 output buffer failures, 0 output buffers swapped outr4#sh ipv6 int tu0Tunnel0 is up, line protocol is upIPv6 is enabled, link-local address is FE80::2E01:104 Global unicast address(es):3FFE:A1:A2:A3::2, subnet is 3FFE:A1:A2:A3::2/127 Joined group address(es):FF02::1FF02::1:FF00:2FF02::1:FF01:104MTU is 1480 bytesICMP error messages limited to one every 100 millisecondsICMP redirects are enabledND DAD is enabled, number of DAD attempts: 1ND reachable time is 30000 milliseconds