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From "Rohit Yadav (JIRA)" <>
Subject [jira] [Commented] (CLOUDSTACK-8451) Static Nat show wrong remote IP in VM behind VPC
Date Tue, 19 May 2015 07:11:00 GMT


Rohit Yadav commented on CLOUDSTACK-8451:

[~andrija] do you think remove the rule "SNAT all – * eth2 to:IP" will
cause issue?

> Static Nat show wrong remote IP in VM behind VPC
> ------------------------------------------------
>                 Key: CLOUDSTACK-8451
>                 URL:
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: KVM, Network Controller, Virtual Router
>    Affects Versions: 4.4.3, 4.3.2, 4.5.1
>         Environment: Ubuntu 14.04, ACS 4.5.1-SNAPSHOT
>            Reporter: Andrija Panic
> When configuring Port FOrwarding or Static NAT on VPC VR, and connect from outside world
to VPC IP address, traffic gets forwarded to VM behind VPC.
> But if you run "netstat -antup | grep $PORT" (where port is i.e. ssh port) - given result
will show that remote connections come from the Source NAT IP of the VR, instead of the real
remote client IP.
> Example:
> private VM:
> Source NAT IP on VPC VR:
> Additional Public IP on VPC VR.
> Remote client public IP: (external to VPC)
> Test:
> from SSH to port 22 (or any other port)
> inside do "netstat -antup | grep 22"
> Result: Remote IP show is instead of
> We found a solution (somwhat tested, and not sure if this would break anything...)
> Problem is in VRs iptables NAT table, POSTROUTING chain, rule:
> SNAT all -- * eth2 to:
> where is public IP of VR
> eth2: is Public Interface of VR
> When this rule is deleted, NAT is working fine.
> This is serious issue for anyone using VPC, since there is no way to see real remote
client IP, and this no firewall funtionality inside VM, SIP doesnt work, web server logs are
useless etc.
> I also experienced this problem with 4.3.x releases.

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