Help me make sense of these traceroutes please

Sam Moats sam at circlenet.us
Fri Dec 27 17:22:58 UTC 2013


Thanks to everyone who responded off list and on.
Sam Moats

On 2013-12-26 11:21, Josephson, Marcus wrote:
> Start at slide 50:
>
> This is documented further by the following Nanog presentation.
> 
> http://www.nanog.org/meetings/nanog47/presentations/Sunday/RAS_Traceroute_N47_Sun.pdf
>
> -Marcus
>
>
> -----Original Message-----
> From: Jimmy Hess [mailto:mysidia at gmail.com]
> Sent: Wednesday, December 25, 2013 10:28 AM
> To: Martin Hotze
> Cc: nanog at nanog.org
> Subject: Re: Help me make sense of these traceroutes please
>
> On Wed, Dec 25, 2013 at 8:03 AM, Martin Hotze <m.hotze at hotze.com> 
> wrote:
>>
>> > On 2013-12-25 00:16, Sam Moats wrote:
>>
> ...
>
>> > You are likely seeing the effects of asymmetric routing.
>> . .. or the effect of passing traffic through NSA infrastructure.
>>
>>
> Ah... NSA.   That's probably it.
> So much for my theory of a Router virtual chassis  straddling  the 
> atlantic.
>
>  or the extra kinetic energy carried by the overseas-bound packet
> took longer for the router to absorb and rebound with an ICMP.
>
>
>
>
>
> But in all seriousness --- what is probably happening here, is  the
> result of extra  "hops"  that don't show up in  traceroute.
> MPLS tunnels could well fit the bill.
>
>
>
> Other things to consider when latency seems sensitive to destination
> IP --- are preceding device in the traceroute might also have 
> multiple
> links to the same device;  with one link congested and some form of
> IP-based load sharing,  that happens to be the toward-overseas link.
>
>
>
>> SCNR, #m
>
> --
> -JH




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