Unix/Linux Go Back    

Security Discuss UNIX and Linux computer and network security, cyber security, cyber attacks, IT security, and more.

Openvpn nat and iptables


iptables, vpn

Thread Tools Search this Thread Display Modes
Old Unix and Linux 11-04-2016   -   Original Discussion by end
end's Unix or Linux Image
end end is offline
Registered User
Join Date: Nov 2016
Last Activity: 8 November 2016, 1:09 PM EST
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Openvpn nat and iptables

good day good people


first to tell that firewall and vpn is working as expected, but I notice something strange.

I have host system ip) firewall is blocking everything except port to vpn.
I have vpn on virtualized system (CentOS both host and virtual). They are behind MikroTik router and then to my ISP router. This is a home setup I'm just experimenting.

PREROUTING to all other is blocked by iptables.

I noticed with Wireshark from host that while I'm connected to vpn from another pc that is connecting to ip addresses of websites I visit while in same time is connected to vpn. like: XX.XX.XX public ip tcp udp sites i visit

but is unnecessarily making connections to website ip addresses. She cannot make the reqests because DNS and ports for that are blocked. So this is because postrouting command my best guess. Can this somehow be disabled? First this is a security issue, second its unnecessary.

Someone told me that this is because NAT setup. but I believe that this can be disabled somehow, I didn't find solution yet so maybe someone know how.


Moderator's Comments:
Openvpn nat and iptables We had to correct a lot of spelling errors. Please put more effort into using proper english

Last edited by Scrutinizer; 11-05-2016 at 03:48 AM.. Reason: Spelling
Sponsored Links

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Linux More UNIX and Linux Forum Topics You Might Find Helpful
Thread Thread Starter Forum Replies Last Post
OpenVPN and NAT nickb1976 Solaris 0 08-05-2015 04:27 PM
iptables for openvpn sdnix UNIX for Dummies Questions & Answers 0 08-15-2014 12:38 PM
iptables in a NAT scenario capri_guy84 Security 1 05-17-2013 04:12 PM
NAT Loopback and iptables 6765656755 Red Hat 0 04-07-2013 11:18 AM
Iptables/TC: how to make masqueraded traffic go through an openVPN tun0? theVOID IP Networking 2 08-27-2008 11:46 PM

All times are GMT -4. The time now is 06:59 AM.