Long hops on international paths
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:
> 6 188.8.131.52 1.895 ms [x] (zayo.telia.ter1.ord7.us.zip.zayo.com.,
> CAIDA-GEOLOC -> Chicago, IL, US)
> 7 184.108.40.206 99.242 ms [x] (prs-b3-link.ip.twelve99.net.,
> CAIDA-GEOLOC -> Paris, FR)
220.127.116.11.in-addr.arpa name = zayo.telia.ter1.ord7.us.zip.zayo.com.
18.104.22.168.in-addr.arpa 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.
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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