When I ran:
dig +short txt_netblocks.pearsoncmg.com There were no results
returned.
To check my syntax, I tried the same command on google:
dig +short txt _netblocks.google.com
"v=spf1 ip4:216.239.32.0/19 ip4:64.233.160.0/19 ip4:66.249.80.0/20
ip4:72.14.192.0/18 ip4:209.85.128.0/17 ip4:66.102.0.0/20 ip4:74.125.0.0/16
ip4:64.18.0.0/20 ip4:207.126.144.0/20 ip4:173.194.0.0/16 ?all"
This is what a dig with no modifiers produced:
dig media.pearsoncmg.com
; <<>> DiG 9.6.2-P2 <<>> media.pearsoncmg.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 24005
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;media.pearsoncmg.com. IN A
;; ANSWER SECTION:
media.pearsoncmg.com. 332 IN CNAME
media.pearsoncmg.com.edgesuite.net.
media.pearsoncmg.com.edgesuite.net. 17780 IN CNAME a1355.g.akamai.net.
a1355.g.akamai.net. 20 IN A 64.208.186.90
a1355.g.akamai.net. 20 IN A 64.208.186.120
;; Query time: 1564 msec
;; SERVER: 10.1.1.11#53(10.1.1.11)
;; WHEN: Tue Aug 30 09:25:55 2011
;; MSG SIZE rcvd: 147
Looks like we have reached an impasse.
Shane
-----Original Message-----
From: John Aldrich [mailto:[email protected]]
Sent: Tuesday, August 30, 2011 9:26 AM
To: NT System Admin Issues
Subject: RE: How to determine a host's IP range
Looks like it's hosted by Akamai, which might explain why you can't get an
answer from the folks running the course.
From: Damien Solodow [mailto:[email protected]]
Sent: Tuesday, August 30, 2011 8:51 AM
To: NT System Admin Issues
Subject: Re: How to determine a host's IP range
Do a dig or nslookup on the host; the results will contain all the currently
published IP addresses for it.
--------------------------
Sent using BlackBerry
From: Thomas Mullins [mailto:[email protected]]
Sent: Tuesday, August 30, 2011 08:40 AM
To: NT System Admin Issues <[email protected]>
Subject: How to determine a host's IP range
Good morning everyone,
Our students have an online class that uses a lot of videos. When ran through
the general student proxy, the quality of these videos is very bad. In the
past when we have these issues, we would route traffic to these hosts out a NAT
gateway. Then we would tell IE not to proxy for that host. This may not be
the best way, but it works for our situation.
This particular host media.pearsoncmg.com uses a round robin type of DNS. If
you do a DNS lookup today, you may get 64.211.144.100. Then another class will
get something like 69.31.16.217. We have contacted the people who run the
course, and they will not give us the IP range. Is there a way I can get that
information across the net?
Thanks
Shane
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