www.arin.net

[James Jun]

> I checked with source routing (yes, this still works in IPv6 and it's
> wonderful for debugging!) that the path is symmetrical.  My guess is
> that there is an MTU mismatch on the interconnection between GBLX and
> Equinix (probably a tunnel).
> 

Thanks for the insight.  I checked the ticket db and I still have a ticket
opened by a user back in 2005 regarding tcp sessions hanging when
downloading from HEAnet, or any other paths going thru OCCAID<->GBLX in
Ashburn.

For the time being, I've temporarily rerouted our east-coast traffic with
GBLX to Chicago and Palo Alto interconnects which are not affected by
mtu-mismatch somewhere to my knowledge.  The path may be less optimal in
latency-wise but let me know if you can establish a tcp session and transfer
data now.[1]

I'll look more into the old ticket soon to follow up on the mtu mismatch,
but I'm on the road right now at this moment.

As far as OCCAID->Sprint->ARIN path, it appears to be an issue between
Sprint and ARIN, so if someone from ARIN is on this list, may be he could
provide some insight :)

james

[1]new path:

traceroute6 to ftp.heanet.ie (2001:770:18:aa40::c101:c140) from
2001:4830:100:20::4, 64 hops max, 12 byte packets
 1  mis.ge-0-2-0.r2.bos.twdx.net (2001:4830:100:20::1)  0.625 ms  0.486 ms
0.225 ms
 2  0.ae2-4000m.c1.bos.twdx.net (2001:4830:1ff::193)  0.248 ms  0.260 ms
0.216 ms
 3  0.ae5-2000m.c2.bos.twdx.net (2001:4830:1ff:224::226)  0.496 ms  0.351 ms
0.170 ms
 4  0.10ge2-0.cr1.bos1.us.occaid.net (2001:4830:e1::1)  0.300 ms  0.300 ms
0.513 ms
 5  23.ge0-0.cr1.ord1.us.occaid.net (2001:4830:ff:1300::2)  21.978 ms
21.911 ms  21.608 ms
 6  2001:450:1:2000::c (2001:450:1:2000::c)  23.862 ms  23.914 ms  23.988 ms
 7  2001:450:2001:1000:0:670:1708:1225 (2001:450:2001:1000:0:670:1708:1225)
133.074 ms  132.837 ms  133.092 ms
 8  luna-pos1-0.kil.core.hea.net (2001:770:90:7::1)  144.405 ms  132.365 ms
133.060 ms
 9  hyperion-gige5-1.cwt.core.hea.net (2001:770:400:11::1)  133.242 ms
132.881 ms  133.085 ms
10  ar1-cwt-gige6-1.hea.net (2001:770:400:e::2)  133.039 ms  133.041 ms
132.562 ms
11  blanch-sr1-po1.services.hea.net (2001:770:8:31::2)  133.036 ms  133.053
ms  133.009 ms
12  ftp.heanet.ie (2001:770:18:aa40::c101:c140)  133.064 ms  133.501 ms
133.553 ms