On Thu, 18 Apr 2024, Christopher Hill wrote:
Hi,
I have a question regarding if upstream DNS forwarding can be based on
the source interface? Reading the manual I don't believe it is possible..?
The scenario I have is two VLANs that can talk to each other and both
use dnsmasqfor local name resolution - this works fine. Each VLAN is
configured at the gateway to default route traffic to different VPNs,
e.g. VLAN1 out to VPN1, and VLAN2 to VPN2 respectively, and I would like
dnsmasq to forward requests originating on VLAN1 to the DNS on VPN1, and
the same for VLAN2 forwarding to VPN2.
To illustrate:
tun1 VPN1 VPN2 tun2
10.0.1.1 | | 10.0.2.1
+---+---+
|
WAN
|
+-------+--------+
| eth0 |
VLAN 1 <-+-eth1 eth2-+-> VLAN 2
192.168.1.0/24 | (gateway) | 192.168.2.0/24
+----------------+
I would like to do something like the following in the dnsmasq
configuration on the gateway:
server=eth1,10.0.1.1@tun1
server=eth2,10.0.2.1@tun2
i.e. queries arriving on eth1 get sent to 10.0.1.1 via tun1, and queries
arriving on eth2 get sent to 10.0.2.1 via tun 2.
What I am using is, that I have two VLANs 1 and 2, for each I have a
separate config like
/etc/dnsmasq.d/dnsmasq-eth1.1.conf
/etc/dnsmasq.d/dnsmasq-eth2.2.conf
I did not tried to use a different upstream DNS, but I would say it should
be possible.
Thanks,
Chris
Adam Pribyl
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