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That VoIP Guy
East Lansing, MI
reply to johnnn

Re: Routing Change in SE Mich.: No more router hostnames

Your hop #6 is the hand-off between Comcast and Merit at the Gigapop in Chicago. That router is not currently processing ICMP traffic since they turned on IPv6 a few months ago. Everybody should be seeing the same. It is processing traffic normally otherwise.

Hop #9 is the handoff between Merit and MSU's core infrastructure. It's not an IDP or firewall, but I believe they turned off ICMP processing on the external interface of that Juniper as well. Again, not processing ICMP (pings) is not a big deal.

I wouldn't count MSU a major CDN or peer. We are a part of the peering circle at the Gigapop, but we are hardly major. We have a single 10Gb connection in that direction (10gb in other directions as well, but this would be the one that Comcast peers with us).

Comcast has been changing their local infrastructural to make things more decentralized as of late. This is a good thing. As short as 5 years ago there was a sizable portion of traffic they still backhauled to the Denver area for regular commodity traffic. For those of us in Michigan, Chicago is still the favorite hand-off.


Ypsilanti, MI

Thanks for the awesome information. I'll make sure not to assume stuff! I don't mind that Chicago is the favorite handoff (although I know Merit and Comcast are directly peered elsewhere). It's the fact that hops 2 and 3 (in my original trace) no longer resolve DNS that bothers me. Maybe it's a temporary change, but any step that reduces transparency to the end user, IMHO, isn't a good one!


united state

I've noticed slowdowns, no RDNS and RDNS additions in the last week or so. I'm guessing some equipment upgrades.

Specifically my route to Atlanta shows a new XE interface from GR to Pontiac (hop 5).

  3     8 ms     9 ms     9 ms
  4    22 ms     8 ms     8 ms
  5    11 ms     9 ms     9 ms  xe-4-3-0-0-sur02.grandrapids.mi.michigan.comcast.net []
  6    17 ms    19 ms    19 ms  te-0-1-0-11-ar01.pontiac.mi.michigan.comcast.net []
  7    31 ms    35 ms    23 ms  he-4-4-0-0-cr01.350ecermak.il.ibone.comcast.net []
  8    32 ms    23 ms    23 ms  he-1-2-0-0-cr01.chicago.il.ibone.comcast.net []
  9    40 ms    47 ms    59 ms  cr01.56marietta.ga.ibone.comcast.net []

Also on my Chicago route I have an additional local hop (hop 5):
 3    18 ms    11 ms     8 ms
 4     9 ms    11 ms     9 ms
 5    11 ms     9 ms     9 ms
 6    18 ms    19 ms    19 ms  te-0-1-0-11-ar01.pontiac.mi.michigan.comcast.net []
 7    29 ms    23 ms    23 ms  he-4-5-0-0-cr01.350ecermak.il.ibone.comcast.net []
 8    26 ms    23 ms    23 ms  cr01.chicago.il.ibone.comcast.net []


Ypsilanti, MI

Click for full size
Tracing in the other direction shows an he interface in Pontiac and an xe interface in west Ann Arbor. I know routes aren't the same in each direction, so this may be useless information.