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Hello guys,
On my setup I have different VLANS and each one has its own IP. Thing is that OPNsense I don't know why is setting /etc/hosts with just 1 IP.
So when I do a nslookup from any device on any vlan I was always getting the same server.
In my case every DNS lookup was being redirected to 192.168.20.1 instead of the gateway for the device VLAN.
So I created a CRON job that runs once a day with a script that just removes that line from /etc/hosts.
Create the following files (you can customise script names):
/usr/local/my_custom_scripts/modify_etc_hosts.sh
set execution permissions:
/usr/local/opnsense/service/conf/actions.d/actions_modify_etc_hosts.conf
Now restart the service:
Open System > Settings > Cron and create a new job:
With the above set up it will run daily at 0.00AM. You can customise it at the time that suits better for you.
Edit Service > Unbound DNS > Overrides:
You can test the script by running it manually:
Before running the script:
Output from 1 client on VLAN gateway 192.168.30.1:
After running the script:
On my setup I have different VLANS and each one has its own IP. Thing is that OPNsense I don't know why is setting /etc/hosts with just 1 IP.
So when I do a nslookup from any device on any vlan I was always getting the same server.
In my case every DNS lookup was being redirected to 192.168.20.1 instead of the gateway for the device VLAN.
So I created a CRON job that runs once a day with a script that just removes that line from /etc/hosts.
Create the following files (you can customise script names):
/usr/local/my_custom_scripts/modify_etc_hosts.sh
Code Select
#!/bin/sh
# Removes the line '192.168.20.1 OPNsense OPNsense.localdomain'
sed -i '' '/192.168.20.1 OPNsense OPNsense.localdomain/d' /etc/hosts
set execution permissions:
Code Select
chmod +x '/usr/local/my_custom_scripts/modify_etc_hosts.sh'
/usr/local/opnsense/service/conf/actions.d/actions_modify_etc_hosts.conf
Code Select
[modify_etc_hosts]
command:/usr/local/my_custom_scripts/modify_etc_hosts.sh
parameters:
type:script
message:modifying /etc/hosts
description:Modify /etc/hosts
Now restart the service:
Code Select
service configd restart
Open System > Settings > Cron and create a new job:
With the above set up it will run daily at 0.00AM. You can customise it at the time that suits better for you.
Edit Service > Unbound DNS > Overrides:
You can test the script by running it manually:
Before running the script:
Code Select
cat /etc/hosts
127.0.0.1 localhost localhost.localdomain
::1 localhost localhost.localdomain
192.168.20.1 OPNsense OPNsense.localdomain
Output from 1 client on VLAN gateway 192.168.30.1:
Code Select
nslookup opnsense
Server: 192.168.20.1
Address: 192.168.20.1:53
Non-authoritative answer:
Name: opnsense.localdomain
Address: 192.168.20.1
Code Select
cd /usr/local/my_custom_scripts
./modify_etc_hosts.sh
After running the script:
Code Select
cat /etc/hosts
127.0.0.1 localhost localhost.localdomain
::1 localhost localhost.localdomain
Code Select
nslookup opnsense
Server: 192.168.30.1
Address: 192.168.30.1:53
Non-authoritative answer:
Name: opnsense.localdomain
Address: 192.168.30.1
Name: opnsense.localdomain
Address: 192.168.40.1
Name: opnsense.localdomain
Address: 192.168.50.1
Name: opnsense.localdomain
Address: 192.168.10.1
Name: opnsense.localdomain
Address: 192.168.20.1
