Cisco Firewall :: ASA 5505 - Local Host Names To DNS Server At Main Site

Mar 3, 2013

I ran into a very interesting problem that occurred today and I'm trying to figure out why it happened. If it was one ASA 5505 that just required the reboot, then I'd have just chalked it up to a glitch, but when we built a new AD/ DNS server on the main network at the main site and changed the 3 Remote site ASAs to point to the new DNS server in the DHCPD options, none of them could ping any local host names to the DNS server at the main site they were now pointing too, but external host names { URL} all translated and pinged fine.
 
From a laptop on one of the remote sites, we could ping the new AD/DNS server(192.168.0.3) and the old AD/DNS server(192.168.0.2) and everything else at the main site, and telnet to port 53 showed successful across the Easy VPN from the Remote site to the new server at the main site. When wire shark was added to the new DNS server at the main site, the DNS request and replies for {URL}, for example, came and worked fine, but any requests for local resources never made it to the server from the remote sites.
 
A reboot of one of the Remote Site ASA's corrected the issue. Then I rebooted the other two remote site ASAs, and now DNS was working fine for everybody. I had also tried clearing the ARP cache on the ASAs before resorting to rebooting them. I also tried rebooting the laptop thinking the local DNS cache needed cleared before resorting to rebooting the ASAs. I'm struggling to understand why external, public host names made it through and resolved from the remote sites to the new server at the main site, but anything local failed before even reaching the new server(The new DNS server could resolve requests made by computers at the main site, but the remote sites that traverse the Easy VPN from the ASAs failed).  The new AD/DNS server is the only server configured for DNS for all remote site computers.
 
Is any of this making sense? I'm wondering if clearing the x late or local host tables would have corrected it without having to reboot. I'm just trying to grasp the understanding here and figure out what happened.

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Sep 20, 2012

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Feb 2, 2011

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 Incoming External
allow ip any any
allow tcp any any
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default deny

 [code].....
 
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Jan 16, 2013

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Here is the configuration (removed a few lines not necessary. y.y.x.x = WAN IP of Router x.x.y.y = WAN IP of ASA).
  
Building configuration...
  
Current configuration : 23648 bytes
!
version 12.4
no service pad

[Code].....

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Nov 20, 2012

I have weird problem with a Site to site VPN tunnel from a Cisco ASA 5505 to an Clavister Firewall.When I restart the Cisco ASA 5505 the tunnel is up and down,up, down, down, and I get all strange messages when I see if the tunnel is up or down with the syntax: [code]
 
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Aug 15, 2012

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Licensed features for this platform:
Maximum Physical Interfaces    : 8
VLANs                          : 3, DMZ Restricted
Inside Hosts                   : Unlimited
Failover                       : Disabled
VPN-DES                        : Enabled
[Code]...

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I am not very experienced with Cisco networking.

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Site C - remote office 192.168.30.x
 
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Site B - ASA 5505
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[Code].....

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