I have a centos 7 kvm hypervisor running multiple VMs that are configured to use NAT networking.
These VMs run their services, of which ssh is the most important for administration purposes. I would like to assign ports on the hypervisor that are forwarded to the VMs using firewalld.
My hypervisor has the following interfaces:
3: wlp8s1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
link/ether 94:0c:6d:c4:b8:12 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.30/24 brd 192.168.1.255 scope global dynamic wlp8s1
valid_lft 2627sec preferred_lft 2627sec
inet6 2a02:a03f:268e:3e00:960c:6dff:fec4:b812/64 scope global noprefixroute dynamic
valid_lft 345640sec preferred_lft 345640sec
inet6 fe80::960c:6dff:fec4:b812/64 scope link
valid_lft forever preferred_lft forever
4: virbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
link/ether 52:54:00:64:af:d6 brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
wlp8s1 is my wireless interface connected to my home network, virbr0 is kvms internal network interface.
IPV4 forwarding is enabled:
firewall-cmd --zone=external --add-forward-port=port=2022:proto=tcp:toport=22:toaddr=192.168.122.13
I am using 2 zones: external and dmz:
dmz
interfaces: virbr0
external
interfaces: wlp8s1
One of the VMs is a database server with the following network configuration:
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 52:54:00:df:79:1e brd ff:ff:ff:ff:ff:ff
inet 192.168.122.13/24 brd 192.168.122.255 scope global dynamic eth0
valid_lft 2634sec preferred_lft 2634sec
inet6 fe80::5054:ff:fedf:791e/64 scope link
valid_lft forever preferred_lft forever
and is running sshd listening on port 22:
# systemctl status sshd
sshd.service - OpenSSH server daemon
Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled)
Active: active (running) since Sun 2016-05-22 20:08:45 CEST; 45min ago
...
# ss -ntl
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 128 *:22 *:*
LISTEN 0 128 :::22 :::*
So I have tried following tutorial and the official documentation, which led me to the following chain of commands (on the hypervisor):
# firewall-cmd --zone=external --add-port=2022/tcp
success
# firewall-cmd --zone=external --add-forward-port=port=2022:proto=tcp:toport=22:toaddr=192.168.122.13
success
but alas (from my laptop connected to my home network):
$ ssh 192.168.1.30 -p 2022
ssh: connect to host 192.168.1.30 port 2022: Connection refused
Things I have tested:
Tcp dumps while issueing ssh 192.168.1.30 -p 2022 on my laptop:
On the hypervisor:
# tcpdump -i wlp8s1 port 2022
21:02:50.661181 IP laptop.38052 > hypervisor.down: Flags [S], seq 885834855, win 29200, options [mss 1460,sackOK,TS val 4732781 ecr 0,nop,wscale 7], length 0
On the vm, no packets are received
I can ssh from the hypervisor to the VM
If I change the firewalld forward command to:
firewall-cmd --zone=external --add-forward-port=port=2022:proto=tcp:toport=22:toaddr=192.168.1.30
I can ssh into the hypervisor using its port 2022. Could this signify it has something to do with the zones?
Any help or extra things I could test would be greatly appreciated! Thanks!
P.S.
I did find this similar question indicating firewalld was broken: Fedora 21 Port Forwarding with firewalld (firewall-cmd); how does it REALLY work? Or, does it?
but I'm hoping to find a solution here given the extra info I have hopefully provided :).
