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JohnInSJ
Premium
join:2003-09-22
San Jose, CA
Reviews:
·PHONE POWER
·Comcast

reply to nate1234

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

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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NetFixer
From my cold dead hands
Premium
join:2004-06-24
The Boro
Reviews:
·Comcast Business..
·Vonage
·Cingular Wireless
·Comcast

said by JohnInSJ:

said by nate1234:

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
 



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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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