VM all smtp-connections shows host as IP (OVH)

[simo.suurla]

Hello,

I have strange issue where my Postfix (incoming smtp) server with its own fail over IP shows that all remote connections are from proxmox host srv02.proxmoxhost.com IP address? The same is happening also all other protocols (imap, http..), they see the proxmox IP as remote IP instead the real user remote IP address.

I have enabled firewall in Proxmox (v3.4).
I have configured bridged network.
Server is located at OVH-hosting.

Mail-log exmaple:

Nov 20 06:23:19 mx01 postfix/postscreen[18418]: CONNECT from [200.200.200.200]:41725 to [100.100.100.100]:25
Nov 20 06:23:19 mx01 postfix/postscreen[18418]: PASS OLD [200.200.200.200]:41725
Nov 20 06:23:19 mx01 postfix/smtpd[18419]: connect from srv02.proxmoxhost.com[200.200.200.200]
Nov 20 06:23:20 mx01 postfix/smtpd[18419]: NOQUEUE: reject: RCPT from srv02.proxmoxhost.com[200.200.200.200]: 454 4.7.1 <xiaonanzi11165@vip.126.com>: Relay access denied; from=<prua@example.com> to=<xiaonanzi11165@vip.126.com> proto=ESMTP helo=<XL-20160228UDLC>
Nov 20 06:23:20 mx01 postfix/smtpd[18419]: NOQUEUE: reject: RCPT from srv02.proxmoxhost.com[200.200.200.200]: 454 4.7.1 <xiaonanzi11165@vip.126.com>: Relay access denied; from=<prua@example.com> to=<xiaonanzi11165@vip.126.com> proto=ESMTP helo=<XL-20160228UDLC>
Nov 20 06:23:21 mx01 postfix/smtpd[18419]: NOQUEUE: reject: RCPT from srv02.proxmoxhost.com[200.200.200.200]: 454 4.7.1 <xiaonanzi11165@vip.126.com>: Relay access denied; from=<adhlqt@example.com> to=<xiaonanzi11165@vip.126.com> proto=ESMTP helo=<XL-20160228UDLC>
Nov 20 06:23:26 mx01 postfix/smtpd[18419]: too many errors after RCPT from srv02.proxmoxhost.com[200.200.200.200]
Nov 20 06:23:26 mx01 postfix/smtpd[18419]: disconnect from srv02.proxmoxhost.com[200.200.200.200]

 

[simo.suurla]

I was facing exactly this issue: https://forum.proxmox.com/threads/pve-firewall-host-vs-vm.28795/