[
https://issues.apache.org/jira/browse/CLOUDSTACK-10346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16442943#comment-16442943
]
ASF GitHub Bot commented on CLOUDSTACK-10346:
---------------------------------------------
rafaelweingartner commented on issue #2514: [CLOUDSTACK-10346] Problem with NAT
configuration and VMs not accessing each other via public IPs
URL: https://github.com/apache/cloudstack/pull/2514#issuecomment-382473012
No success :(
Here goes my iptables (with PR2579):
```
# Generated by iptables-save v1.4.14 on Wed Apr 18 17:44:29 2018
*nat
:PREROUTING ACCEPT [3:180]
:INPUT ACCEPT [0:0]
:OUTPUT ACCEPT [6:456]
:POSTROUTING ACCEPT [0:0]
-A PREROUTING -d 10.0.2.102/32 -i eth1 -p tcp -m tcp --dport 22 -j DNAT
--to-destination 172.16.0.214:22
-A PREROUTING -d 10.0.2.103/32 -i eth1 -p tcp -m tcp --dport 22 -j DNAT
--to-destination 172.16.0.168:22
-A OUTPUT -d 10.0.2.102/32 -p tcp -m tcp --dport 22 -j DNAT --to-destination
172.16.0.214:22
-A OUTPUT -d 10.0.2.103/32 -p tcp -m tcp --dport 22 -j DNAT --to-destination
172.16.0.168:22
-A POSTROUTING -s 172.16.0.0/24 -o eth2 -j SNAT --to-source 172.16.0.1
-A POSTROUTING -o eth1 -j SNAT --to-source 10.0.2.130
-A POSTROUTING -o eth1 -j SNAT --to-source 10.0.2.102
-A POSTROUTING -d 10.0.2.102/32 -p tcp -m tcp --dport 22 -j SNAT --to-source
172.16.0.214:22
-A POSTROUTING -d 10.0.2.103/32 -p tcp -m tcp --dport 22 -j SNAT --to-source
172.16.0.168:22
COMMIT
# Completed on Wed Apr 18 17:44:29 2018
# Generated by iptables-save v1.4.14 on Wed Apr 18 17:44:29 2018
*mangle
:PREROUTING ACCEPT [215:13820]
:INPUT ACCEPT [195:11692]
:FORWARD ACCEPT [23:2308]
:OUTPUT ACCEPT [166:12048]
:POSTROUTING ACCEPT [189:14356]
:ACL_OUTBOUND_eth2 - [0:0]
:VPN_STATS_eth1 - [0:0]
-A PREROUTING -i eth2 -m state --state RELATED,ESTABLISHED -j CONNMARK
--restore-mark --nfmask 0xffffffff --ctmask 0xffffffff
-A PREROUTING -s 172.16.0.0/24 ! -d 172.16.0.1/32 -i eth2 -m state --state
NEW -j ACL_OUTBOUND_eth2
-A FORWARD -j VPN_STATS_eth1
-A POSTROUTING -p udp -m udp --dport 68 -j CHECKSUM --checksum-fill
-A ACL_OUTBOUND_eth2 -d 224.0.0.18/32 -j ACCEPT
-A ACL_OUTBOUND_eth2 -j ACCEPT
-A ACL_OUTBOUND_eth2 -d 225.0.0.50/32 -j ACCEPT
-A VPN_STATS_eth1 -o eth1 -m mark --mark 0x525
-A VPN_STATS_eth1 -i eth1 -m mark --mark 0x524
COMMIT
# Completed on Wed Apr 18 17:44:29 2018
# Generated by iptables-save v1.4.14 on Wed Apr 18 17:44:29 2018
*filter
:INPUT DROP [3:180]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [166:12048]
:ACL_INBOUND_eth2 - [0:0]
:FW_EGRESS_RULES - [0:0]
:NETWORK_STATS - [0:0]
:NETWORK_STATS_eth1 - [0:0]
-A INPUT -d 172.16.0.1/32 -i eth2 -p tcp -m tcp --dport 443 -m state --state
NEW -j ACCEPT
-A INPUT -d 172.16.0.1/32 -i eth2 -p tcp -m tcp --dport 80 -m state --state
NEW -j ACCEPT
-A INPUT -d 172.16.0.1/32 -i eth2 -p tcp -m tcp --dport 53 -j ACCEPT
-A INPUT -d 172.16.0.1/32 -i eth2 -p udp -m udp --dport 53 -j ACCEPT
-A INPUT -j NETWORK_STATS
-A INPUT -d 224.0.0.18/32 -j ACCEPT
-A INPUT -d 225.0.0.50/32 -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -i eth0 -p tcp -m tcp --dport 3922 -m state --state NEW,ESTABLISHED
-j ACCEPT
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -i eth2 -p udp -m udp --dport 67 -j ACCEPT
-A INPUT -s 172.16.0.0/24 -i eth2 -p udp -m udp --dport 53 -j ACCEPT
-A INPUT -s 172.16.0.0/24 -i eth2 -p tcp -m tcp --dport 53 -j ACCEPT
-A INPUT -i eth2 -p tcp -m tcp --dport 80 -m state --state NEW -j ACCEPT
-A INPUT -i eth2 -p tcp -m tcp --dport 8080 -m state --state NEW -j ACCEPT
-A FORWARD -j NETWORK_STATS_eth1
-A FORWARD -j NETWORK_STATS
-A FORWARD -s 172.16.0.0/16 ! -d 172.16.0.0/16 -j ACCEPT
-A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -d 172.16.0.0/24 -o eth2 -j ACL_INBOUND_eth2
-A OUTPUT -j NETWORK_STATS
-A ACL_INBOUND_eth2 -d 225.0.0.50/32 -j ACCEPT
-A ACL_INBOUND_eth2 -d 224.0.0.18/32 -j ACCEPT
-A ACL_INBOUND_eth2 -j ACCEPT
-A ACL_INBOUND_eth2 -j DROP
-A NETWORK_STATS -i eth0 -o eth2 -p tcp
-A NETWORK_STATS -i eth2 -o eth0 -p tcp
-A NETWORK_STATS ! -i eth0 -o eth2 -p tcp
-A NETWORK_STATS -i eth2 ! -o eth0 -p tcp
-A NETWORK_STATS_eth1 -s 172.16.0.0/24 -o eth1
-A NETWORK_STATS_eth1 -d 172.16.0.0/24 -i eth1
COMMIT
# Completed on Wed Apr 18 17:44:29 2018
```
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> Problem with NAT configuration and VMs not accessing each other via public IPs
> ------------------------------------------------------------------------------
>
> Key: CLOUDSTACK-10346
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-10346
> Project: CloudStack
> Issue Type: Bug
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Reporter: Rafael Weingärtner
> Assignee: Rafael Weingärtner
> Priority: Major
>
> When users create a VPC, and configure a NAT from a public IP to application
> in a VM. This VM(applications) are not accessible via public IP for other VMs
> in the same VPC.
>
> The problem is in the NAT table. If you take a closer look at rules, you will
> see something like:
> {code:java}
> -A PREROUTING -d publicIP/32 -i eth1 -p tcp -m tcp --dport 80 -j DNAT
> --to-destination internalIp:80
> {code}
> The problem is that according to this rule only packets coming via
> eth1(public interface), will be “redirected” to the internal IP. We need an
> extra entry to each one of the NAT configurations. For the presented rule, we
> would need something like:
> {code:java}
> -A PREROUTING -d publicIP/32 -i eth2 -p tcp -m tcp --dport 80 -j DNAT
> --to-destination internalIp:80
> {code}
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