I am witnessing a weird situation and not sure where else to look. A tunnel has refused to come up between an C2811 and a C1811. I have looked and looked like the whole day! I hate obfuscation, but I have done some. I can avail the obfuscated details privately:-) C1811#sh runn int tunnel 50 Building configuration... Current configuration : 191 bytes ! interface Tunnel50 description Inet test to C2811 ip address 192.168.55.197 255.255.255.252 keepalive 5 2 tunnel source Vlan5 tunnel destination 85.9x.x.23 tunnel key 98745612 end C1811#sh int vlan 5 *Vlan5 is up, line protocol is up* Hardware is EtherSVI, address is 001e.f7d4.8750 (bia 001e.f7d4.8750) Internet address is 41.x.x.1x/30 MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:39:52, output never, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (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 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 1200 packets output, 72000 bytes, 0 underruns 0 output errors, 1 interface resets 0 output buffer failures, 0 output buffers swapped out C1811#sh int tunn 50 *Tunnel50 is up, line protocol is down* Hardware is Tunnel Description: Inet test to TCRB Internet address is 192.168.55.197/30 MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation TUNNEL, loopback not set Keepalive set (5 sec), retries 2 Tunnel source 41.x.x.1x (Vlan5), destination 85.9x.x.23 Tunnel protocol/transport GRE/IP Key 0x272CBD89, sequencing disabled Checksumming of packets disabled Tunnel TTL 255 Fast tunneling enabled Tunnel transmit bandwidth 8000 (kbps) Tunnel receive bandwidth 8000 (kbps) Last input 00:35:35, output 01:40:44, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 2349 Queueing strategy: fifo 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 13 packets input, 728 bytes, 0 no buffer Received 0 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 63 packets output, 5310 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 output buffer failures, 0 output buffers swapped out On the other side (2811): C2811-Telecity#sh runn int tunn 50 Building configuration... Current configuration : 267 bytes ! interface Tunnel50 description Inet test to C1811 ip address 192.168.55.198 255.255.255.252 ip flow ingress ip flow egress qos pre-classify keepalive 5 2 tunnel source 85.9x.x.23 tunnel destination 41.x.x.1x tunnel key 98745612 end C2811-Telecity#sh int tunn 50 *Tunnel50 is up, line protocol is down* Hardware is Tunnel Description: Inet test to C1811 Internet address is 192.168.55.198/30 MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation TUNNEL, loopback not set Keepalive set (5 sec), retries 2 Tunnel source 85.9x.x.23, destination 41.x.x.1x Tunnel protocol/transport GRE/IP Key 0x272CBD89, sequencing disabled Checksumming of packets disabled Tunnel TTL 255 Fast tunneling enabled Tunnel transmit bandwidth 8000 (kbps) Tunnel receive bandwidth 8000 (kbps) Last input never, output 00:00:02, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 1 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 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 3365 packets output, 188673 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 output buffer failures, 0 output buffers swapped out -- Best regards, Odhiambo WASHINGTON, Nairobi,KE +254733744121/+254722743223 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Damn!!