The ranting of an IT Professional:

DNS

1

January 26, 2011  9:12 PM

ASA rewriting DNS queries



Posted by: Jason Tramer
ASA, DNS, manipulating, NAT, queries, query, re-writing

http://www.techrepublic.com/blog/networking/cisco-asa-and-dns-pain-is-there-a-doctor-in-the-house/1140 This article was a god send for me. I was trouble shooting this issue for a while. In my case I had an internal device on a private vlan that needed to resolve the public address of another...

February 12, 2010  2:56 PM

Cisco router not handing out DNS server to DHCP clients



Posted by: Jason Tramer
Cisco, client, DHCP, DNS, pool, router, server

I had a weird issue yesterday. I had a Cisco 1800 series router that was configured to hand out DHCP and up until a few days ago everything worked fine with it. Then suddenly out of the blue it still handed out DHCP but did not hand out the DNS-Server option even though it was configured. I...


September 16, 2009  3:44 PM

The system detected a possible attempt to compromise security



Posted by: Jason Tramer
cifs, DNS, errors, event log, netlogon, The system detected a possible attempt to compromise security

I got the above error when trying to access a network share on a workstation. The event log was filled with Cifs and netlogon errors.  In doing some investigation I found that this machine had a manually set DNS entry which pointed to a former DC that had been demoted. What was interesting is that...


April 3, 2009  6:29 PM

Unable to join domain “The network location cannot be reached”



Posted by: Jason Tramer
DNS, NetBIOS, TCP/IP, The network location cannot be reached, Unable to join domain, WINS

I got this error when joining a windows XP to the domain. I ensured that DNS resolution was working fine.  After some testing I determined that the issue was NetBIOS resolution. An Ipconfig /all showed that there was no WINS server address (even though DHCP should be giving one out) and NetBIOS...


February 23, 2009  7:51 PM

Migrating DNS records



Posted by: Jason Tramer
best practices, DNS

I am really tired of the way some people handle DNS record changes. It's like people (even people in the IT industry) don't seem to realize that changes are not instant. It takes on average between 24-48 hours for any record changes to propagate across the Internet and yet you have DNS cowboys...


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