Short-circuited traceroutes on FIOS

Tue Dec 10 20:50:57 UTC 2019

I had this issue while looking at Ripe Atlas measurements.

Turns out these Verizon boxes spoof ICMP with TTL = 3 (or 2, I don't 
recall). Try doing a UDP or TCP based traceroute instead.

Maybe you're seeing the same problem.

Kind Regards,
Filip

On 12/10/19 8:47 PM, Joe Maimon wrote:
> Anyone have an idea why there are some destinations that on 
> residential verizon fios here in NY area terminate right on first 
> external hop?
>
> There seems to be a CDN common denominator here. On other networks 
> with more typical BGP paths and traceroutes, users are reporting 
> issues accessing these sites.
>
> C:\Users\Home>tracert www.usfoods.com
>
> Tracing route to statics.usfoods.com [205.132.109.90]
> over a maximum of 30 hops:
>
>   1     3 ms    <1 ms    <1 ms  172.18.24.1
>   2     4 ms     3 ms     3 ms  192.168.2.33
>   3    17 ms     6 ms     3 ms  statics.usfoods.com [205.132.109.90]
>
> Trace complete.
>
> C:\Users\Home>tracert atworkhp.americanexpress.com
>
> Tracing route to atworkhp.americanexpress.com.akadns.net [139.71.19.87]
> over a maximum of 30 hops:
>
>   1     2 ms    <1 ms    <1 ms  172.18.24.1
>   2     3 ms     4 ms    23 ms  192.168.2.33
>   3    21 ms    11 ms     5 ms atworkhomepage2.americanexpress.com 
> [139.71.19.87]
>
> Trace complete.
>
> C:\Users\Home>tracert portal.discover.com
>
> Tracing route to e14577.x.akamaiedge.net [23.51.172.254]
> over a maximum of 30 hops:
>
>   1     3 ms     1 ms    18 ms  172.18.24.1
>   2    21 ms     7 ms     6 ms  192.168.2.33
>   3     4 ms     2 ms     2 ms 
> a23-51-172-254.deploy.static.akamaitechnologies.com [23.51.172.254]
>
> Trace complete.
>
>
-- 
Filip Hruska
Linux System Administrator