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Full Discussion: Conditional Forwarding using BIND9
Special Forums IP Networking Conditional Forwarding using BIND9 Post 302245565 by neked on Friday 10th of October 2008 10:55:41 AM
Old 10-10-2008
Quote:
Originally Posted by otheus
What happens if you set all requests to 10.0.0.1 and THEN 192.168.0.1 ? Is it the problem that requests take a long time if there is no such VPN established? This can be solved by routing tables I think.
I don't want to set all requests to 10.0.0.1 because that means all my DNS queries will go to my workplace first, and that makes me kind of uncomfortable, since my workplace can and do monitor my traffic.

My problem is that I want all my DNS queries to go my ISP's DNS servers first, then to my work place's. This was possible in the past, but my ISP implemented this annoying "assistive DNS feature" that takes all unresolved DNS queries and routes them to their own search page laden with queries.. that means that as far as my computer is concerned, the DNS query is *resolved* because it was routed to the IP of the ISP's search page. What this means is that:

1- I issue a DNS query for somehost.internal.net (this is a host inside the VPN, the VPN's DNS servers should be able to resolve it, but the ISP's DNS would not be able to resolve it)
2- my query is issued first to the ISP's DNS, which is unable to resolve it. Instead of telling me "sorry, we could not find a match for your DNS name" and let the computer ask alternative DNS servers (like the VPN's DNS), the ISP's DNS instead volunteers and routes me to their own search page.
3- my computer thinks the DNS query resolved fine, and doesn't try the other configured DNS servers.
 

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LEARN ABOUT LINUX

avahi-dnsconfd.action

avahi-dnsconfd.action(8)				      System Manager's Manual					  avahi-dnsconfd.action(8)

NAME

       avahi-dnsconfd.action - avahi-dnsconfd action script

SYNOPSIS

       /etc/avahi/avahi-dnsconfd.action

DESCRIPTION

       avahi-dnsconfd.action  is  the  action  script  that is called whenever a new unicast DNS server is found or removed by avahi-dnsconfd. The
       default script as shipped with avahi patches /etc/resolv.conf to reflect the changed unicast DNS server configuration.

PARAMETERS

       argv[1] Contains the character "+" if the DNS server is new, "-" when it shall be removed from the DNS server list.

       argv[2] The IP address of the DNS server.

       argv[3] Numerical network interface number this DNS server was found on.

       argv[4] Numerical protocol number this DNS server was found on. (usually 2 for IPv4 and 10 for IPv6)

ENVIRONMENT

       AVAHI_INTERFACE Contains the textual interface name the corresponds with argv[3]. (e.g. "eth0")

       AVAHI_INTERFACE_DNS_SERVERS Contains a list of all DNS servers that avahi-dnsconfd found on the interface  $AVAHI_INTERFACE,  separated	by
       spaces.

       AVAHI_DNS_SERVERS Contains a list of all DNS server that avahi-dnsconfd found on all interfaces, separated by spaces.

AUTHORS

       The Avahi Developers <avahi (at) lists (dot) freedesktop (dot) org>; Avahi is available from http://avahi.org/

SEE ALSO

       avahi-dnsconfd(8), avahi-daemon(8)

COMMENTS

       This man page was written using xml2man(1) by Oliver Kurth.

Manuals 							       User						  avahi-dnsconfd.action(8)
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