Can someone explain what this command is really supposed to do?
If I set it on the Tunnel interface which has a known destination I get a value of UNKNOWN for the Tunnel source.
I would like the Tunnel source to be dynamic in that the IOS chooses the IP address from the UP interface used in the path (route) to the destination, i.e.: outbound interface.
Thanks for any insight.
Current configuration : 489 bytes ! interface Tunnel0 ip address 192.168.66.196 255.255.255.192 no ip redirects ip mtu 1400 ip pim sparse-dense-mode ip nhrp authentication XYZ ip nhrp group XYZ_QOS ip nhrp map multicast 172.31.31.31 ip nhrp map 192.168.66.193 172.31.31.31 ip nhrp network-id 111 ip nhrp holdtime 180 ip nhrp nhs 192.168.66.193 ip tcp adjust-mss 1360 qos pre-classify tunnel source dynamic tunnel destination 172.31.31.31 tunnel key 100111 tunnel protection ipsec profile XYZ end
TESTRTR#sh int t0 Tunnel0 is up, line protocol is down Hardware is Tunnel Internet address is 192.168.66.196/26 MTU 17912 bytes, BW 100 Kbit/sec, DLY 50000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation TUNNEL, loopback not set Keepalive not set Tunnel source UNKNOWN, destination 172.31.31.31 Tunnel protocol/transport GRE/IP Key 0x1870F, sequencing disabled Checksumming of packets disabled Tunnel TTL 255, Fast tunneling enabled Tunnel transport MTU 1472 bytes Tunnel transmit bandwidth 8000 (kbps) Tunnel receive bandwidth 8000 (kbps) Tunnel protection via IPSec (profile "XYZ") Last input never, output 00:30:59, output hang never Last clearing of "show interface" counters 00:58:18 Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo (QOS pre-classification) Output queue: 0/0 (size/max) 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 0 packets input, 0 bytes, 0 no buffer Received 0 broadcasts (0 IP multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 0 packets output, 0 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 unknown protocol drops 0 output buffer failures, 0 output buffers swapped out
For a tunnel you are supposed to supply the two terminating end points. Using dynamic will not require you to configure the source address. You can connect to Internet anyways [may be with a dynamic IP address], the tunnel will be created. Pretty much what you have already stated.
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