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johnnn

join:2007-01-25
Ypsilanti, MI
reply to JohnInSJ

Re: [Speed] Congested Comcast Peering with Akamai, Google in Mid

I'm using anycast (75.75.75.75), and my router doesn't support IPv6.



depster

join:2001-06-07
united state

It may be that your local router is being upgraded... in your first post Hop 3 indicated a 'te' interface.

When I just tracerouted to it now, it's showing as a 'xe' interface.

  3    20 ms    10 ms    10 ms  96.120.41.137
  4    12 ms     7 ms     7 ms  xe-8-2-0-sur01.grandrapids.mi.michigan.comcast.net [68.86.140.185]
  5    17 ms    19 ms    27 ms  te-0-2-0-4-ar01.taylor.mi.michigan.comcast.net [69.139.254.29]
  6    18 ms    17 ms    19 ms  xe-7-3-0-sur01.wannarbor.mi.michigan.comcast.net [68.85.218.201]
 


DrDrew
That others may surf
Premium
join:2009-01-28
SoCal
kudos:15

said by depster:

It may be that your local router is being upgraded... in your first post Hop 3 indicated a 'te' interface.

When I just tracerouted to it now, it's showing as a 'xe' interface.

  3    20 ms    10 ms    10 ms  96.120.41.137
  4    12 ms     7 ms     7 ms  xe-8-2-0-sur01.grandrapids.mi.michigan.comcast.net [68.86.140.185]
  5    17 ms    19 ms    27 ms  te-0-2-0-4-ar01.taylor.mi.michigan.comcast.net [69.139.254.29]
  6    18 ms    17 ms    19 ms  xe-7-3-0-sur01.wannarbor.mi.michigan.comcast.net [68.85.218.201]
 

It's a different interface of the same router. OP's being from the edge of the network inbound, yours being from the core of the network outbound.
--
Two is one, one is none. If it's important, back it up... Somethimes 99.999% availability isn't even good enough.

johnnn

join:2007-01-25
Ypsilanti, MI

DrDrew is right. When I do tracerts *to* the edge they travel through an xe interface.



JohnInSJ
Premium
join:2003-09-22
Aptos, CA
reply to johnnn

said by johnnn:

I'm using anycast (75.75.75.75), and my router doesn't support IPv6.

Try using comcast's DNS. Just for grins.
--
My place : »www.schettino.us


EG
The wings of love
Premium
join:2006-11-18
Union, NJ
kudos:9

1 edit

3 recommendations

reply to depster

FWIW, just a point. As Dr.Drew stated, it's the same physical router. This data needs to also be examined when evaluating the rDNS info on hops;

te-8-2-ur02
xe-7-0-sur01

Even though the IP address is the same, the slot, port, and ring data is different.

Some examples of some meanings;

Some examples;

ge = gigabit ethernet.

te / xe= ten gigabit ethernet.

p, po, pos = Packet Over Sonet (an OC-3 or faster connection).

XE / TE = Juniper / Cisco 10GigE Interface
be / ae = Cisco Bundle Ethernet / Juniper Aggregate Ethernet

he = hundred gigabit ethernet.

1-1, 1-2, 1-11, 6-1, 9-1, 2-2, etc. = slot and port.

ar01, cr01, ur01

User Ring (UR), Area Ring (AR), Core Ring (CR) routing.


johnnn

join:2007-01-25
Ypsilanti, MI

EG, you're the best.



EG
The wings of love
Premium
join:2006-11-18
Union, NJ
kudos:9

I doubt that but thanks for your kind words !



NathanO

join:2008-08-21
Moorestown, NJ
reply to JohnInSJ

That is Comcast's anycast DNS



whfsdude
Premium
join:2003-04-05
Washington, DC
Reviews:
·Comcast
reply to EG

said by EG:

User Ring (UR), Area Ring (AR), Core Ring (CR) routing.

The one I've never understood is "SUR." I have yet to see this interface name used outside of Comcast. Happen to know?

johnnn

join:2007-01-25
Ypsilanti, MI

Click for full size
New interface on the
Click for full size
KS route
Click for full size
CA route
Click for full size
Peak time comparison
There appear to be significant changes underway. One of the routers hostnames has reappeared, and I'm on a different interface. A hop prior to Pontiac has been eliminated from the previous configuration.

There was likely some sort of maintenance window on Friday morning as evidenced by the smokeping graphs attached (this makes sense, as it corresponds with the lowest utilization period for the college town I'm in). Comparing the ICMP performance for peak windows between this week and last, there's been a significant improvement.


JohnInSJ
Premium
join:2003-09-22
Aptos, CA
reply to NathanO

said by NathanO:

That is Comcast's anycast DNS

Perhaps using one from here »www.whatsmydns.net/dns/usa/comcast.html

Michigan

Primary DNS: 68.87.77.130

Secondary DNS: 68.87.72.130

Primary IPv6 DNS: 2001:558:1016:C:68:87:77:130

Secondary IPv6 DNS: 2001:558:100E:4:68:87:72:130

Would yield different CDN entry points?
--
My place : »www.schettino.us


ArrayList
netbus developer
Premium
join:2005-03-19
Evanston, IL
Reviews:
·Comcast
reply to EG

said by EG:

ge = gigabit ethernet.

te / xe= ten gigabit ethernet.

p, po, pos = Packet Over Sonet (an OC-3 or faster connection).

XE / TE = Juniper / Cisco 10GigE Interface
be / ae = Cisco Bundle Ethernet / Juniper Aggregate Ethernet

he = hundred gigabit ethernet.

1-1, 1-2, 1-11, 6-1, 9-1, 2-2, etc. = slot and port.

ar01, cr01, ur01

User Ring (UR), Area Ring (AR), Core Ring (CR) routing.

holy cow man. Thanks for this information. I know it's pretty trivial for non-comcast network engineers, but it really helps add some light into where my packets go when they leave town.


depster

join:2001-06-07
united state
reply to whfsdude

said by whfsdude:

said by EG:

User Ring (UR), Area Ring (AR), Core Ring (CR) routing.

The one I've never understood is "SUR." I have yet to see this interface name used outside of Comcast. Happen to know?

Maybe Switched User Ring?


NetFixer
Snarl For The Camera Please
Premium
join:2004-06-24
The Boro
Reviews:
·Cingular Wireless
·Comcast Business..
·Vonage
reply to JohnInSJ

said by JohnInSJ:

said by NathanO:

That is Comcast's anycast DNS

Perhaps using one from here »www.whatsmydns.net/dns/usa/comcast.html

...

Would yield different CDN entry points?

That is exactly what I do for the forwarding servers in my in-house DNS server. I chose the primary servers for Atlanta and Chicago because most of my routes go through either Atlanta or Chicago.





C:\>dig -x 68.87.68.162
 
; <<>> DiG 9.9.2 <<>> -x 68.87.68.162
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 62426
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
 
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1280
;; QUESTION SECTION:
;162.68.87.68.in-addr.arpa.     IN      PTR
 
;; ANSWER SECTION:
162.68.87.68.in-addr.arpa. 1196 IN      PTR     nrcns.s3woodstock.ga.atlanta.comcast.net.
 
;; Query time: 31 msec
;; SERVER: 192.168.9.2#53(192.168.9.2)
;; WHEN: Sun Jan 27 13:11:54 2013
;; MSG SIZE  rcvd: 108
 
C:\>dig -x 68.87.72.130
 
; <<>> DiG 9.9.2 <<>> -x 68.87.72.130
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 26004
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
 
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1280
;; QUESTION SECTION:
;130.72.87.68.in-addr.arpa.     IN      PTR
 
;; ANSWER SECTION:
130.72.87.68.in-addr.arpa. 6112 IN      PTR     nrcns.area4.il.chicago.comcast.net.
130.72.87.68.in-addr.arpa. 6112 IN      PTR     chic-cns.area4.il.chicago.comcast.net.
 
;; Query time: 15 msec
;; SERVER: 192.168.9.2#53(192.168.9.2)
;; WHEN: Sun Jan 27 13:12:24 2013
;; MSG SIZE  rcvd: 125
 



--
A well-regulated militia, being necessary to the security of a free State, the right of the people to keep and bear arms shall not be infringed.

When governments fear people, there is liberty. When the people fear the government, there is tyranny.

makaze
Premium
join:2004-02-23
USA

1 recommendation

reply to depster

said by depster:

said by whfsdude:

said by EG:

User Ring (UR), Area Ring (AR), Core Ring (CR) routing.

The one I've never understood is "SUR." I have yet to see this interface name used outside of Comcast. Happen to know?

Maybe Switched User Ring?

Nah it's a Super UR. In most areas it's a juniper with multiple AR connections for redundancy.

johnnn

join:2007-01-25
Ypsilanti, MI

So based on the info in this thread, the changes in throughput (things are much improved), and the routing changes I've observed, it looks like Comcast hooked my neighborhood's CMTS (and likely all of wannarbor) into a Super UR whereas before it routed through two regular 10GigE URs on its way to the AR in Pontiac.