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Reverse traceroute times out at remote end of T46493
![[us]](/s/countries/us.gif) Shadow Hawkins on Thursday, 16 December 2010 18:34:32
Hello,
I am using a Windows 7 box (firewall disabled) with the command line AICCU application to do an IPv6 tunnel (T46493) to the usdal01 SixXs POP. For the TAP driver, I installed OpenVPN v 2.1.3... My IPv6 IP address is 2001:1938:80:1a2::2...
Here is my problem, I have the tunnel established, and working as far as I can tell from my end. IPv6 hosts ping perfectly, trace routes work. For instance, an printout from command prompt:
Tracing route to google.com [2a00:1450:8002::6a]
over a maximum of 30 hops:
1 29 ms 28 ms 37 ms gw-419.dal-01.us.sixxs.net [2001:1938:80:1a2::1]
2 31 ms 70 ms 25 ms 2001:4de0:1000:a3::1
3 94 ms 116 ms 92 ms 2001:4de0:1000:28::1
4 113 ms 135 ms 132 ms 2001:4de0:1000:40::1
5 115 ms 131 ms 106 ms 2001:504:13::54
6 121 ms 161 ms 110 ms 2001:4860::1:0:607
7 100 ms 125 ms 106 ms 2001:4860::1:0:5db
8 120 ms 104 ms 128 ms 2001:4860::1:0:755
9 176 ms 212 ms 185 ms 2001:4860::1:0:6
10 231 ms 188 ms 243 ms 2001:4860::1:0:87c
11 187 ms 202 ms 183 ms 2001:4860::2:0:87d
12 183 ms 184 ms 207 ms 2001:4860:0:1::23
13 181 ms 184 ms 182 ms 2a00:1450:8002::6a
Trace complete.
Everything works like a charm. I have a Nokia N900 using T-Mobiles beta IPv6 APN, and it can ping my Windows 7 machine just fine... So, what's the problem?
Reverse tracerouting fails at the final hop... Observe:
IPv6 traceroute from noc.sixxs.net @ SixXS NOC, AS12871 to 2001:1938:80:1a2::2
Hop Node Loss% Sent Last Avg Best Worst
1. 2001:838:1:1::1 0.0% 5 0.4 0.4 0.4 0.4 0.0
2. 2001:838:5:a::1 0.0% 5 1.9 1.9 1.9 2.0 0.0
3. 2001:7f8:1::a501:2989:2 0.0% 5 2.2 2.1 2.1 2.2 0.1
4. 2001:4de0:1000:34::2 0.0% 5 2.3 2.4 2.3 2.6 0.1
5. 2001:4de0:1000:5::2 0.0% 5 83.9 83.8 81.8 86.3 1.9
6. 2001:4de0:1000:30::1 0.0% 5 127.1 120.1 117.6 127.1 4.1
7. 2001:4de0:1000:29::2 0.0% 5 117.6 118.2 117.6 120.3 1.2
8. 2001:4de0:1000:a3::2 0.0% 5 117.7 117.7 117.6 117.7 0.0
9. 2001:1938:80:1a2::2 20.0% 5 148.8 154.4 145.6 162.1 8.5
Or worse yet:
TraceRoute IPv6 Output:
traceroute to 2001:1938:80:1a2::2 (2001:1938:80:1a2::2), 30 hops max, 40 byte packets
1 2001:1af8:4200:b000::1 (2001:1af8:4200:b000::1) 0.896ms 1.053ms 1.119ms
2 2001:1af8:4100::5 (2001:1af8:4100::5) 0.831ms 0.913ms 0.985ms
3 be11.crs.evo.leaseweb.net (2001:1af8::9) 2.045ms 2.035ms 2.020ms
4 amsix.r2.am.v6.hwng.net (2001:7f8:1::a501:2989:1) 1.632ms 5.506ms 5.643ms
5 5-1.ipv6.r2.dc.hwng.net (2001:4de0:1000:5::2) 81.070ms 80.935ms 81.105ms
6 2001:4de0:1000:30::1 (2001:4de0:1000:30::1) 125.647ms 123.323ms 121.099ms
7 2001:4de0:1000:29::2 (2001:4de0:1000:29::2) 116.777ms 116.883ms 116.864ms
8 2001:4de0:1000:a3::2 (2001:4de0:1000:a3::2) 117.032ms 117.003ms 116.994ms
9 * * *
10 * * *
11 * * *
12 * * *
13 * * *
14 * * *
15 * * *
16 * * *
17 * * *
18 * * *
19 * * *
20 * * *
21 * * *
22 * * *
23 * * *
24 * * *
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * *
In contrast, if I try to reverse traceroute SixX's side of the tunnel, everything works fine...
TraceRoute IPv6 Output:
traceroute to 2001:1938:80:1a2::1 (2001:1938:80:1a2::1), 30 hops max, 40 byte packets
1 2001:1af8:4200:b000::1 (2001:1af8:4200:b000::1) 1.132ms 1.166ms 1.234ms
2 2001:1af8:4100::5 (2001:1af8:4100::5) 1.364ms 1.447ms 1.509ms
3 be11.crs.evo.leaseweb.net (2001:1af8::9) 1.559ms 1.546ms 1.531ms
4 amsix.r2.am.v6.hwng.net (2001:7f8:1::a501:2989:1) 1.826ms 15.719ms 1.797ms
5 5-1.ipv6.r2.dc.hwng.net (2001:4de0:1000:5::2) 81.248ms 81.339ms 81.261ms
6 2001:4de0:1000:30::1 (2001:4de0:1000:30::1) 117.132ms 127.371ms 124.642ms
7 2001:4de0:1000:29::2 (2001:4de0:1000:29::2) 116.891ms 116.992ms 116.964ms
8 gw-419.dal-01.us.sixxs.net (2001:1938:80:1a2::1) 116.809ms 116.895ms 116.880 ms
Now, as mentioned before, I have the default windows firewall disabled...
Anyone have an idea what's going on? It doesn't seem to be affecting performance. I get 1.5Mbps at ipv6-speedtest.net, but it just seems like something is wrong if the reverse traceroute doesn't terminate properly.
Thanks in advance!
Joshua Patterson
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