[Dnsmasq-discuss] two DNSMASQ server online

richardvoigt at gmail.com richardvoigt at gmail.com
Wed Apr 2 07:35:48 BST 2008

On Wed, Apr 2, 2008 at 1:54 AM, Philippe Faure <philippe at faure.ca> wrote:
> I have a unique setup. I have two private networks connected by a VPN
>  connection. Both private networks have DNSMASQ running (using DNS and
>  DHCP functionality).  I am finding that a client from network 1 will
>  receive IP address from DHCP server on network 2.
>  Besides ignoring MAC addresss from the other network, which makes it
>  difficult to keep up to date with wireless clients, that keep moving
>  around, is there a way to stop dhcp replies coming from the other
>  network?

Of course you can use packet filtering to drop all UDP port 67/68
traffic to the VPN interface.

>  To add a level complexity.  The DNS server built into dnsmasq need to
>  be able to reference each other, since clients on network 1 need to
>  know about clients on network 2. IP addresses have been assigned to
>  each network, so they don't overlap.
>  I don't know if this is something that dnsmasq can handle or if
>  someone else has come across this situation, and found a way to block
>  only DHCP requests to be transferred over the VPN connection?
>  Thank you
>  Philippe
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