Firewall on said IP?
currently Freebsd+PF.
for debugging, early in my PF firewall, i've set:
pass log quick inet proto icmp from 66.220.2.74 to any icmp-type { echoreq, unreach } keep state
pass log quick inet proto icmp from any to 66.220.2.74 icmp-type { echoreq, unreach } keep state
then @ the Tunnelbroker site, i've submitted the x.x.x.204 endpoint for the existing tunnel. as before, it fails with:
Error: Your IPv4 endpoint is unreachable or unstable
Your IPv4 endpoint must be pingable. If you are blocking ICMP, please allow 66.220.2.74 through your firewall.
and, during the process,
tcpdump -vvvfi tun0 host 66.220.2.74
returns,
tcpdump: listening on tun0, link-type NULL (BSD loopback), capture size 96 bytes
13:18:23.536529 IP (tos 0x0, ttl 58, id 0, offset 0, flags [DF], proto ICMP (1), length 84) 66.220.2.74 > x.x.x.204: ICMP echo request, id 56166, seq 1, length 64
13:18:23.537100 IP (tos 0x0, ttl 57, id 0, offset 0, flags [DF], proto ICMP (1), length 84) 66.220.2.74 > x.x.x.204: ICMP echo request, id 56166, seq 1, length 64
13:18:24.540509 IP (tos 0x0, ttl 58, id 0, offset 0, flags [DF], proto ICMP (1), length 84) 66.220.2.74 > x.x.x.204: ICMP echo request, id 56166, seq 2, length 64
13:18:24.540778 IP (tos 0x0, ttl 57, id 0, offset 0, flags [DF], proto ICMP (1), length 84) 66.220.2.74 > x.x.x.204: ICMP echo request, id 56166, seq 2, length 64
13:18:25.542489 IP (tos 0x0, ttl 58, id 0, offset 0, flags [DF], proto ICMP (1), length 84) 66.220.2.74 > x.x.x.204: ICMP echo request, id 56166, seq 3, length 64
13:18:25.542757 IP (tos 0x0, ttl 57, id 0, offset 0, flags [DF], proto ICMP (1), length 84) 66.220.2.74 > x.x.x.204: ICMP echo request, id 56166, seq 3, length 64
and, also,
tcpdump -vvv -tttt -nei pflog0
returns,
2008-10-29 13:06:08.802172 rule 5/0(match): pass in on tun0: (tos 0x0, ttl 58, id 0, offset 0, flags [DF], proto ICMP (1), length 84) 66.220.2.74 > x.x.x.204: ICMP echo request, id 18020, seq 1, length 64
2008-10-29 13:06:08.802430 rule 5/0(match): pass out on tun0: (tos 0x0, ttl 57, id 0, offset 0, flags [DF], proto ICMP (1), length 84) 66.220.2.74 > x.x.x.204: ICMP echo request, id 18020, seq 1, length 64