[outages] UUnet cross-USA latency increased

[Jeremy Chadwick]

Mark,

1. Doesn't Verizon/MCI/UUnet/Alter.net use ICMP prioritisation on their
routers?  Packet loss or latency seen at an individual router hop is
usually (not always, but usually) indicative of that.

2. You stripped hops 4 onward from your output, which doesn't help
analysis at all; if latency is truly a problem (oversaturated link,
etc.), it "trickles down" through each subsequent hop,

3. You didn't provide a return-path traceroute (e.g. dst-->src) so it's
hard to say "the problem is with Verizon" necessarily.  (I'm inclined to
believe you given their history (believe me, I'm more than familiar with
them at this point), but still...)

This may benefit you:

http://www.nanog.org/meetings/nanog47/presentations/Sunday/RAS_Traceroute_N47_Sun.pdf

Finally, and maybe the most important point of all:

If no loss is seen end-to-end (source-to-dest) then what's the concern?
Or are you saying there's no packet loss end-to-end but there is latency
end-to-end?  (Your Email doesn't explicitly say that, and I don't want
to make assumptions...)

-- 
| Jeremy Chadwick                                   jdc at koitsu.org |
| UNIX Systems Administrator                http://jdc.koitsu.org/ |
| Mountain View, CA, US                                            |
| Making life hard for others since 1977.             PGP 4BD6C0CB |

On Thu, Oct 18, 2012 at 09:47:49AM -0700, Mark Kent wrote:
> FYI, the usual 75ms SJC to IAD on UUnet (AS701) backbone has been over
> 110ms for about an hour.
> 
>   2 0.so-0-2-0.XL1.SJC1.ALTER.NET (152.63.54.18) [AS 701] 0 msec 1 msec 1 msec
>   3  * 0.xe-7-0-2.XL3.IAD8.ALTER.NET (152.63.32.230) [AS 701] 163 msec 140 msec
> 
> No end-to-end loss observed.
> 
> -mark
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