johnnn
join:2007-01-25
Ypsilanti, MI | reply to DrDrew
Re: [Speed] Congested Comcast Peering with Akamai, Google in Mid DrDrew is right. When I do tracerts *to* the edge they travel through an xe interface. |
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 JohnInSJPremium
join:2003-09-22
San Jose, CA
 ·PHONE POWER
 ·Comcast
| 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.
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My place : »www.schettino.us |
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 EGThe wings of lovePremium
join:2006-11-18
Union, NJ
kudos:9
1 edit | 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. |
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johnnn
join:2007-01-25
Ypsilanti, MI | EG, you're the best. |
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EGThe wings of lovePremium
join:2006-11-18
Union, NJ
kudos:9 | I doubt that but thanks for your kind words !  |
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| reply to JohnInSJ
That is Comcast's anycast DNS |
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 whfsdudePremium
join:2003-04-05
Washington, DC
 ·T-Mobile US
| 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? |
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johnnn
join:2007-01-25
Ypsilanti, MI | 
New interface on the | 
KS route | 
CA route | 
Peak time comparison |
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. |
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JohnInSJPremium
join:2003-09-22
San Jose, CA Reviews:
·PHONE POWER
·Comcast
| reply to nate1234
said by nate1234: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?
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My place : »www.schettino.us |
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| reply to johnnn
I didn't go through the entire thread thoroughly, but wanted to add an idea.....
I had the same beef with my 105/20 service. I eventually figured out that the cause was using DNS servers other than Comcasts. This resulted in me being connected to the wrong CDN sites. I switched to the Comcast DNS servers being offered to me via DHCP, and my download speeds jumped dramatically. So if you are using alternate DNS, consider giving your primary/secondary Comcast DNS servers a try. |
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 FBGuyPremium
join:2005-03-19
Evanston, IL
·Comcast
·T-Mobile US
| 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. |
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| 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? |
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 NetFixerFrom my cold dead handsPremium
join:2004-06-24
The Boro
·Comcast Business..
·Vonage
·Cingular Wireless
·Comcast
| reply to JohnInSJ
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
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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. |
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makazePremium
join:2004-02-23
USA | 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. |
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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. |
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