Long hops on international paths

Christopher Morrow morrowc.lists at gmail.com
Tue Jan 18 06:03:34 UTC 2022

Looking at your 1 repeat ORD example:

On Tue, Jan 18, 2022 at 12:17 AM PAUL R BARFORD <pb at cs.wisc.edu> wrote:

> 6  1.895 ms      [x] (zayo.telia.ter1.ord7.us.zip.zayo.com.,
> CAIDA-GEOLOC -> Chicago, IL, US)
> 7  99.242 ms    [x] (prs-b3-link.ip.twelve99.net.,
> CAIDA-GEOLOC -> Paris, FR)
> name = zayo.telia.ter1.ord7.us.zip.zayo.com. name = ae51.zayo.ter1.ord7.us.zip.zayo.com.

it looks like the probes you selected (at least the depaul univ one(s)) are
finding the 'best path' to whatever destinations via depaul -> zayo ->
It looks like zayo/telia interconnect at that /31.
Based on:


i'd guess that:
 1) telia has an mpls core with no-decrement-ttl enabled
 2) the hidden hosp include NYC and possibly cleveland/wdc
 3) judging the path information purely on traceroute hops is error prone.
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