1

I have a port forwarding problem with Proxmox under Debian.

I have two interfaces ( eth0 and vmbr2 ), how can I access to my client VM ( web server ) from external network by forwarding from a single public IP ?

I did some bad configuration I think on /etc/network/interfaces

Here's my interfaces :

auto eth0
iface eth0 inet static
        address  xxx.xxx.xxx.xxx
        netmask  255.255.255.224
        gateway  xxx.xxx.xxx.xxx
        up route add -net xxx.xxx.xxx.xxx netmask 255.255.255.224 gw xxx.xxx.xxx.xxx eth0

end for vmbr2 interface :

auto vmbr2
#private sub network
iface vmbr2 inet static
        address  192.168.100.254
        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 '192.168.100.0/24' -o eth0 -j ACCEPT
        post-down iptables -t nat -D POSTROUTING -s '192.168.100.0/24' -o eth0 -j ACCEPT

        post-up iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 2222 -j DNAT --to 192.168.100.6:22
        post-down iptables -t nat -D PREROUTING -i eth0 -p tcp --dport 2222 -j DNAT --to 192.168.100.6:22

Thank you very much for your help

1

Just replace "ACCEPT" to "MASQUERADE" in the POSTROUTING rule.

  • Thank you very much ! you saved me a lot of time ... I did this configuration and run 'sysctl -w net.ipv4.ip_forward=1', after a restart of service it worked ! – Simo.jaouad Nov 14 '16 at 22:45

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.