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Author Topic: Dropping ICMP Traffic?  (Read 6081 times)

darkorb

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Dropping ICMP Traffic?
« on: October 07, 2008, 05:05:20 AM »

Hi All,

I'm connected to the London/UK pop and sometime in the last few days all my traceroute's are showing like this

Code: [Select]
root@web:~# traceroute6 ipv6.google.com
traceroute to ipv6.l.google.com (2001:4860:0:1001::68) from 2001:470:1f09:282:208:74ff:fe46:a8f3, 30 hops max, 16 byte packets
 1  gateway.ipv6.darkstar.be (2001:470:1f09:282::1)  2.655 ms  0.327 ms  0.378 ms
 2  * * *
 3  * * *
 4  * * *
 5  * * *
 6  2001:4860:0:1001::68 (2001:4860:0:1001::68)  28.801 ms  31.534 ms  28.306 ms

Nothing's changed inside my network, and it only seem's to happen going across the EU pop's - Seem's fine across the USA pop's

Code: [Select]
traceroute to tunnelbroker.net (2001:470:0:63::2) from 2001:470:1f09:282:208:74ff:fe46:a8f3, 30 hops max, 16 byte packets
 1  gateway.ipv6.darkstar.be (2001:470:1f09:282::1)  4.029 ms  0.265 ms  0.202 ms
 2  * * *
 3  * * *
 4  10gigabitethernet2-3.core1.nyc4.he.net (2001:470:0:3e::1)  87.966 ms  86.912 ms  86.039 ms
 5  10gigabitethernet3-1.core1.sjc2.he.net (2001:470:0:33::1)  167.981 ms  171.179 ms  177.72 ms
 6  gige-g1-1.core1.fmt1.he.net (2001:470:0:2f::1)  175.994 ms  166.405 ms  167.243 ms
 7  tunnelbroker.net (2001:470:0:63::2)  171.838 ms  166.972 ms  198.934 ms

Any ideas? It's causing my reverse traceroute script to lag more than a little now days (had to take it off of my site for now).
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broquea

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Re: Dropping ICMP Traffic?
« Reply #1 on: October 07, 2008, 06:28:29 PM »

FYI, contacted Google about this and our peering session in London. Waiting to hear back from them regarding this, so I don't have an ETA on a resolution right now.
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broquea

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Re: Dropping ICMP Traffic?
« Reply #2 on: October 08, 2008, 01:36:14 AM »

Ok, they got their London peering with us fixed. I notice with a quick tunnel created that traceroute6 seems to kinda stop inside Google's network after their first hop. Running mtr behind the same tunnel gets a different result and actually reaches the site with 1 hop inside Google's network that has no results (just * * *). My guess is that Google is doing something with the traffic which would be outside of our control.
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darkorb

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Re: Dropping ICMP Traffic?
« Reply #3 on: October 08, 2008, 02:11:17 AM »

Thanks for the replies, doesn't explain why traces to tunnelbroker.net would do the same though?

Not a major issue, just I have a few scripts on my site for people to check their IPv6 connectivity so handy if it doesn't lag ;) Unless you know a way to make traceroute6 ignore the first 3 hops?

Cheers :)
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broquea

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Re: Dropping ICMP Traffic?
« Reply #4 on: October 08, 2008, 08:14:37 AM »

Actually I wasn't getting that problem to ipv6.he.net with traceroute6 or mtr. I just double-checked right now and its still clean even from the tunnel-server itself. Can you retest?

Code: [Select]
1  gige-g4-6.core1.lon1.he.net  0.378 ms  0.246 ms  0.137 ms
 2  10gigabitethernet2-3.core1.nyc4.he.net  69.463 ms  69.275 ms  69.308 ms
 3  10gigabitethernet3-1.core1.sjc2.he.net  148.919 ms  148.485 ms  148.567 ms
 4  gige-g1-1.core1.fmt1.he.net  148.874 ms  148.994 ms  148.897 ms
 5  ipv6.he.net  148.875 ms  148.983 ms  149.038 ms
« Last Edit: October 08, 2008, 08:20:04 AM by broquea »
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darkorb

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Re: Dropping ICMP Traffic?
« Reply #5 on: October 09, 2008, 03:35:41 AM »

Very weird....

Checked from two different Linux boxes

Code: [Select]
root@web:~# traceroute6 tunnelbroker.net
traceroute to tunnelbroker.net (2001:470:0:63::2) from 2001:470:1f09:282:208:74ff:fe46:a8f3, 30 hops max, 16 byte packets
 1  gateway.ipv6.darkstar.be (2001:470:1f09:282::1)  0.356 ms  0.261 ms  0.184 ms
 2  * * *
 3  * * *
 4  10gigabitethernet2-3.core1.nyc4.he.net (2001:470:0:3e::1)  89.175 ms  85.923 ms  90.483 ms
 5  10gigabitethernet3-1.core1.sjc2.he.net (2001:470:0:33::1)  164.462 ms  166.209 ms  165.848 ms
 6  gige-g1-1.core1.fmt1.he.net (2001:470:0:2f::1)  178.423 ms  177.342 ms  173.228 ms
 7  tunnelbroker.net (2001:470:0:63::2)  171.104 ms  165.076 ms  166.091 ms


Code: [Select]
gateway:~# traceroute6 tunnelbroker.net
traceroute to tunnelbroker.net (2001:470:0:63::2), 30 hops max, 40 byte packets
 1  * * *
 2  * * *
 3  10gigabitethernet2-3.core1.nyc4.he.net (2001:470:0:3e::1)  91.600 ms  96.368 ms  96.352 ms
 4  10gigabitethernet3-1.core1.sjc2.he.net (2001:470:0:33::1)  174.674 ms  174.660 ms  176.065 ms
 5  gige-g1-1.core1.fmt1.he.net (2001:470:0:2f::1)  181.104 ms  181.199 ms  181.183 ms
 6  tunnelbroker.net (2001:470:0:63::2)  179.645 ms  166.582 ms  166.714 ms

Maybe it's just me ???
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