Fedora templates have a weird issue where the packet counter on the sys-net nat
FORWARD chain does not increment. The PREROUTING chain does increment.
The commands work, my configuration is correct, as it was working on R3.2 and
does work on R4.0 if using an older debian-8 template for sys-net and
sys-firewall.
Using Debian-8 template that came with Qubes 4.0 RC2 or earlier.... does work
as expected.
It has iptables 1.4, while fedora has iptables 1.6.
I can go back and forth between fedora-25/26 and debian-8, and it will work
when on debian.
Debian-9 has a weird issue where the counter on the sys-net FORWARD chain does
get incremented, but nothing is sent to sys-firewall. Verified with tcpdump.
Sys-Net:
iptables -t nat -A PREROUTING -i ens5 -p tcp -d <outside_ip_of_sys-net> --dport
2200 -j DNAT --to-destination <ip_of_sys-firewall> -m comment --comment
'PortFwd'
iptables -I FORWARD 2 -i ens5 -p tcp <ip_of_sys-firewall> --dport 2200 -m
conntrack --ctstate NEW -j ACCEPT -m comment --comment 'PortFwd'
Sys-Firewall:
iptables -t nat -A PREROUTING -i eth0 -p tcp -d <ip_of_sys-firewall> --dport
2200 -j DNAT --to-destination <ip_of_AppVM> -m comment --comment 'PortFwd'
iptables -I FORWARD 2 -i ens5 -p tcp <ip_of_AppVM> --dport 2200 -m conntrack
--ctstate NEW -j ACCEPT -m comment --comment 'PortFwd'
Target AppVM:
iptables -I INPUT 5 -p tcp --dport 2200 -m conntrack --ctstate NEW -j ACCEPT -m
comment --comment 'PortFwd'
SYS-NET
sudo iptables -vnL -t nat | grep 2200 ; sudo iptables -vnL FORWARD | grep 2200
3 180 DNAT tcp -- eth0 * 0.0.0.0/0 10.0.1.53
tcp dpt:2200 /* PortFwd */ to:10.137.0.6
0 0 ACCEPT tcp -- eth0 * 0.0.0.0/0 10.137.0.6
tcp dpt:2200 ctstate NEW /* PortFwd */
My configuration works flawlessly for many months on R3.2 and even works today
when using debian-8 for my sys-net and sys-firewall.
And yes, of course my net.ipv4.ip_forward is 1
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