Short-circuited traceroutes on FIOS

Christopher Morrow morrowc.lists at gmail.com
Wed Dec 11 04:57:58 UTC 2019


On Tue, Dec 10, 2019 at 11:44 PM Lee <ler762 at gmail.com> wrote:
> It's protocol specific.  Windows tracert uses icmp instead of udp.
> On a linux box try
>   ping -t 2 205.132.109.90
>
> You should get a time to live exceeded but the Verizon router gives
> you an echo reply instead.

that's hilariously bad :( I think this is the OLT really that's doing this...
$ ping -t 3 205.132.109.90
PING 205.132.109.90 (205.132.109.90) 56(84) bytes of data.
>From 130.81.32.236 icmp_seq=1 Time to live exceeded

$ ping -t 1 205.132.109.90
PING 205.132.109.90 (205.132.109.90) 56(84) bytes of data.
>From 192.168.100.1 icmp_seq=1 Time to live exceeded

$ ping -t 2 205.132.109.90
PING 205.132.109.90 (205.132.109.90) 56(84) bytes of data.
64 bytes from 205.132.109.90: icmp_seq=1 ttl=254 time=3.38 ms

An outbound traceroute has:
 1  _gateway (192.168.100.1)  2.537 ms  2.587 ms  2.703 ms
 2  * * *
 3  B3320.WASHDC-LCR-21.verizon-gni.net (130.81.32.236)  6.638 ms
B3320.WASHDC-LCR-22.verizon-gni.net (130.81.32.238)  6.223 ms  6.414
ms
...

and inbound that hop 2 is:
 6  HundredGigE2-4-0-3.WASHDC-LCR-22.verizon-gni.NET (140.222.238.55)
5.504 ms HundredGigE2-6-0-3.WASHDC-LCR-21.verizon-gni.NET
(140.222.234.53)  9.261 ms  9.266 ms
 7  ae203-0.WASHDC-VFTTP-320.verizon-gni.net ()  7.955 ms  3.026 ms
ae204-0.WASHDC-VFTTP-320.verizon-gni.net (130.81.32.239)  2.347 ms

oh well, just wonky gpon again?



More information about the NANOG mailing list