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Old 01-28-2016, 08:47 AM   #1
LQ Newbie
Registered: Jan 2016
Location: Munich, Germany
Distribution: Debian
Posts: 2

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Question VPN correctly used by ping, but NOT by iceweasel

my setup is Debian 8.3.0 i386, xfce, openvpn, iceweasel.
Without VPN eth0 is my only interface, everything fine.
ping reproducibly around 20 msec.
With VPN started I have eth0 and tun0 interfaces.
I expect tun0 to be the default/system interface.
ping reproducibly around 100 msec
ping -I eth0 is still 20 msec
My conclusion: networking correctly switched to tun0.
Using iceweasel however I find that eth0 is used, not tun0,
employing a test surface on the VPN provider side.
This is true regardless of the iceweasel setting
- use system networking settings or
- auto detect networking setting
What can I do to instruct iceweasel to truly use the system
setting ?

Thanks and regards
Old 02-08-2016, 11:29 AM   #2
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Location: Wroclaw, Poland
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Check your routes, for example by "ip route", there is information for system (applications) where to send data.
Old 02-08-2016, 06:03 PM   #3
Registered: Jul 2015
Location: Nanjing, China
Distribution: Debian
Posts: 62

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Does it help if you restart the browser after connecting the VPN. This is what I usually do when switching in/out of my VPN.

Also, I check my IP address after switching with this site - - just to make sure the address has changed.
Old 02-08-2016, 09:25 PM   #4
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Hello and welcome to LQ.

Might as well ask a few questions. Do you have IPv6? Did you configure some setting to break VPN? That is in order to use some ip outside of vpn.
Old 02-16-2016, 06:02 AM   #5
LQ Newbie
Registered: Jan 2016
Location: Munich, Germany
Distribution: Debian
Posts: 2

Original Poster
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Dear all,
thanks for your suggestions, I have noted them down. Unfortunately I have been sidestepped to a more
important activity, so I will come back later and apply your suggestions at that time.

Thanks again


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