5:31 p.m.
Hello all,
I’m currently trying to figure out how to forward ports to guests that are on a NAT
Network. I have followed the directions on https://wiki.libvirt.org/page/Networking under
the “Forwarding Incoming Connections” Section and get connection refused when attempting
to connect.
System: Ubuntu Server 18.04.1
Virsh / LibVirtd Version: 4.0.0
Here’s the contents of /etc/libvirt/hooks/qemu
#!/bin/bash
# IMPORTANT: Change the "VM NAME" string to match your actual VM Name.
# In order to create rules to other VMs, just duplicate the below block and configure
# it accordingly.
if [ "${1}" = "testy" ]; then
# Update the following variables to fit your setup
GUEST_IP='10.128.10.100'
GUEST_PORT='22'
HOST_PORT='2588'
if [ "${2}" = "stopped" ] || [ "${2}" =
"reconnect" ]; then
/sbin/iptables -D FORWARD -o virbr0 -d $GUEST_IP -j ACCEPT
/sbin/iptables -t nat -D PREROUTING -p tcp --dport $HOST_PORT -j DNAT --to
$GUEST_IP:$GUEST_PORT
fi
if [ "${2}" = "start" ] || [ "${2}" =
"reconnect" ]; then
/sbin/iptables -I FORWARD -o virbr0 -d $GUEST_IP -j ACCEPT
/sbin/iptables -t nat -I PREROUTING -p tcp --dport $HOST_PORT -j DNAT --to
$GUEST_IP:$GUEST_PORT
fi
fi
Here’s my network XML
<network>
<name>olympus</name>
<uuid>3b0d968c-8166-42f7-8109-e5f0317cab42</uuid>
<forward mode='nat'>
<nat>
<port start='1024' end='65535'/>
</nat>
</forward>
<bridge name='virbr1' stp='on' delay='0'/>
<mac address='52:54:00:bb:18:6b'/>
<ip address='10.128.10.1' netmask='255.255.255.0'>
<dhcp>
<range start='10.128.10.2' end='10.128.10.254'/>
<host mac='52:54:00:8d:f5:0c' name='testy'
ip='10.128.10.100'/>
</dhcp>
</ip>
</network>
And here’s the results of iptables -L -vt nat:
BEFORE VM BOOT:
Chain PREROUTING (policy ACCEPT 46615 packets, 6618K bytes)
pkts bytes target prot opt in out source destination
Chain INPUT (policy ACCEPT 46615 packets, 6618K bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 198K packets, 18M bytes)
pkts bytes target prot opt in out source destination
Chain POSTROUTING (policy ACCEPT 198K packets, 18M bytes)
pkts bytes target prot opt in out source destination
24 1812 RETURN all -- any any 10.128.10.0/24
base-address.mcast.net/24
0 0 RETURN all -- any any 10.128.10.0/24 255.255.255.255
17 1020 MASQUERADE tcp -- any any 10.128.10.0/24 !10.128.10.0/24
masq ports: 1024-65535
15 1700 MASQUERADE udp -- any any 10.128.10.0/24 !10.128.10.0/24
masq ports: 1024-65535
0 0 MASQUERADE all -- any any 10.128.10.0/24 !10.128.10.0/24
22 1666 RETURN all -- any any 192.168.122.0/24
base-address.mcast.net/24
0 0 RETURN all -- any any 192.168.122.0/24 255.255.255.255
0 0 MASQUERADE tcp -- any any 192.168.122.0/24 !192.168.122.0/24
masq ports: 1024-65535
8 1168 MASQUERADE udp -- any any 192.168.122.0/24 !192.168.122.0/24
masq ports: 1024-65535
0 0 MASQUERADE all -- any any 192.168.122.0/24 !192.168.122.0/24
AFTER VM BOOT
Chain PREROUTING (policy ACCEPT 2 packets, 120 bytes)
pkts bytes target prot opt in out source destination
0 0 DNAT tcp -- any any anywhere anywhere
tcp dpt:2588 to:10.128.10.100:22
Chain INPUT (policy ACCEPT 2 packets, 120 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 18 packets, 1263 bytes)
pkts bytes target prot opt in out source destination
Chain POSTROUTING (policy ACCEPT 18 packets, 1263 bytes)
pkts bytes target prot opt in out source destination
24 1812 RETURN all -- any any 10.128.10.0/24
base-address.mcast.net/24
0 0 RETURN all -- any any 10.128.10.0/24 255.255.255.255
17 1020 MASQUERADE tcp -- any any 10.128.10.0/24 !10.128.10.0/24
masq ports: 1024-65535
15 1700 MASQUERADE udp -- any any 10.128.10.0/24 !10.128.10.0/24
masq ports: 1024-65535
0 0 MASQUERADE all -- any any 10.128.10.0/24 !10.128.10.0/24
22 1666 RETURN all -- any any 192.168.122.0/24
base-address.mcast.net/24
0 0 RETURN all -- any any 192.168.122.0/24 255.255.255.255
0 0 MASQUERADE tcp -- any any 192.168.122.0/24 !192.168.122.0/24
masq ports: 1024-65535
8 1168 MASQUERADE udp -- any any 192.168.122.0/24 !192.168.122.0/24
masq ports: 1024-65535
0 0 MASQUERADE all -- any any 192.168.122.0/24 !192.168.122.0/24
And lastly heres what actually happens on attempt to SSH:
rhys@odin:~$ ssh rhys(a)172.16.99.170 -p 2258
ssh: connect to host 172.16.99.170 port 2258: Connection refused
rhys@odin:~$
The connection refused is instant, not a timeout.
I’ve ensured that ufw is disabled.
Any help appreciated. I just can’t figure this out.
Sent from Mail for Windows 10