On 28.09.2015 13:11, Xen wrote: > Just want to say that I have been trying (in OpenSUSE) to get a rather > simple scenario working, but failed, probably due to kernel mechanics: > > - main connection receives all traffic destined for port 80, 443. > - VPN receives all else. > > I just consider it a more special case of directing VPN traffic to > only the VPN network (no forwarding/routing at the end node). > > It required a few simple steps: > - tag (SYN) packages for 80,443 with a mark > - use the fwmark as an iproute rule > - the rule sends the traffic to a different routing table > > Unfortunately although the routing seems to work, the traffic gets > returned but not progressed by the kernel apparently due to some > blocking or safety measure. I could not get around it, though I tried > everything I could find on the web. > > A fourth step that may be required is: > - snat the outgoing packages to match the interface they are now sent > out on (meaning to match its ip address) such that a reverse route > will coincide with the outgoing route that the kernel/routing system > has chosen for the outgoing packets. > > I thought it was going to be a simple thing to setup and though I > spent easily 4-5 hours on it, I could not get it to work. > > Perhaps if this seems an interesting or important use case, someone > who is more knowledgeable than me could look into it? It seems > rather... that it would look really bad on Linux if this common use > case is a near impossibility due to kernel mechanics or security > measures, or whatever else is causing it. Not sure how else to phrase > it. I mean that it would not be a selling point, that sort of stuff. > > You could even integrate it into NM if it did work. "Route only > selected ports over this VPN" or "Route everything except selected > ports over this VPN". Would really be awesome. > > Just wanted to say that.
What kind of VPN do you use? OpenVPN, IPsec? In case it is OpenVPN or some similar VPN that creates a new virtual interface, the easiest solution would be: 1. Create new network namespace 2. Move VPN interface into this namespace and "fix" routing 3. Start applications (e.g. firefox, terminal) that should access VPN in the given namespace. SG
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