nanog mailing list archives
Re: www.cisco.com no resolve?
From: Stephane Bortzmeyer <bortzmeyer () nic fr>
Date: Sat, 19 Mar 2016 15:45:05 +0100
On Fri, Mar 18, 2016 at 10:53:15PM -0700, John Kinsella <jlk () thrashyour com> wrote a message of 49 lines which said:
Confirmed in Northern California, on all 3 primary NS servers. A little Friday night maintenance window, maybe?
Isn't it simply because the alias chain is awfully long (five steps) and it may fail with resolvers which are hardened against the "infinite recursion" attack? % dig A www.cisco.com ... ;; ANSWER SECTION: www.cisco.com. 3538 IN CNAME www.cisco.com.akadns.net. www.cisco.com.akadns.net. 238 IN CNAME wwwds.cisco.com.edgekey.net. wwwds.cisco.com.edgekey.net. 21538 IN CNAME wwwds.cisco.com.edgekey.net.globalredir.akadns.net. wwwds.cisco.com.edgekey.net.globalredir.akadns.net. 3538 IN CNAME e144.dscb.akamaiedge.net. e144.dscb.akamaiedge.net. 20 IN A 104.93.242.137 http://www.ssi.gouv.fr/uploads/2014/12/idns_attack_anssi.pdf
Current thread:
- www.cisco.com no resolve? Dmitry Sherman (Mar 18)
- Re: www.cisco.com no resolve? John Kinsella (Mar 18)
- Re: www.cisco.com no resolve? Stephane Bortzmeyer (Mar 19)
- Re: www.cisco.com no resolve? David S. (Mar 20)
- Re: www.cisco.com no resolve? Stephane Bortzmeyer (Mar 19)
- Re: www.cisco.com no resolve? Dan Lacey (Mar 20)
- Re: www.cisco.com no resolve? John Kinsella (Mar 18)