Network configuration
How to have network and let be accessible from internet without additionnal ip
On your Proxmox instance bash :
Update the file /etc/network/interfaces and add this at the end of the file
auto vmbr1
iface vmbr1 inet static
address 10.0.0.1/24
netmask 255.255.255.0
bridge-ports none
bridge-stp off
bridge-fd 0
post-up echo 1 > /proc/sys/net/ipv4/ip_forward
post-up iptables -t nat -A POSTROUTING -s '10.0.0.0/24' -o vmbr0 -j MASQUERADE
post-down iptables -t nat -D POSTROUTING -s '10.0.0.0/24' -o vmbr0 -j MASQUERADE
Restart services : service networking restart
You should have something like that :
With this configuration, when you create a VM simply choose vmbr1 network.
NAT port forwarding
To add port forwarding you can simply update the /etc/network/interfaces file and add this line in iface vmbr1 inet static update the line according to your need
post-up iptables -t nat -A PREROUTING -i vmbr0 -p tcp --dport 3389 -j DNAT --to 10.0.0.2:3389
post-down iptables -t nat -D PREROUTING -i vmbr0 -p tcp --dport 3389 -j DNAT --to 10.0.0.2:3389
## Add DHCP and DNS server to your Proxmox Virtual Environment
To do that, we will use dnsmasq which is a simple and lightweight app
```bash
apt install dnsmasq -y
Edit the configuration file
Fill these values :
server=1.1.1.1 #DNS Server IP
interface=vmbr1 #Interface where dnsmasq will works
domain=stephang.local #Optional
dhcp-range=10.0.0.10,10.0.0.150,1h #It's an example
dhcp-option=vmbr1,3,10.0.0.1
dhcp-leasefile=/var/lib/misc/dnsmasq.leases #Uncomment it line 538
# If you want to reserve IP for specific mac :
dhcp-host=E6:13:98:65:CA:9F,10.0.0.2,SERVER1
dhcp-host=G2:84:14:27:FE:4G,10.0.0.3,SERVER2
Restart the service :
That's all ! Now when you create a VM and set vmbr1 network, VM will have network and auto generated IP !
Bonus : add DNS record accessible by all clients
Sometimes when you want to add local dns records and with dnsmasq it's really easy, you need to simply update your hosts file
Now all ips in vmbr1 will have the dns record
Created: 2023-01-28