Hi Grant,
Add IPTABLE rules in the FORWARD mangle to handle the normal packets (
ICMP,etc) with specific mark values and add filters for the same .
As far as IPSEC traffic is concerned, its generally generated from the
box, unless its acting as an IPSEC pass thru. Hence u can add rules in
the POSTROUTING chain to mark all AH/ESP packets with some mark value. I
believe since IPSEC packet is generated from the box, the source ip will
be that of the incoming interface..... Not sure about this!!!!
Hope this helps.
Regards,
Vinod C
Grant Taylor wrote:
Hi, I have what to me is an interesting issue. I am wanting to
prioritize (QoS) traffic that will be passing through an IPSec
(OpenS/WAN) VPN between two (identical) Linux routers. I know that I
can apply the IPSec patches (1-4) to the kernel and IPTables (if they
are not already applied by now) filter traffic before and after IPSec
encapsulation. My problem is that I don't know if I will be able to
QoS the traffic that will be encapsulated as far as I know QoS
prioritization (via CBQ or HTB) only applies to traffic that is being
dequeue from the skbuffers to go out the physical interface. In my
mind the traffic that is to be encapsulated does not ""go out a
physical interface to be dequeued in the order that I want to
prioritize. I know that I can QoS IPSec VPN traffic (IP/ESP) to a
higher priority than any other IP traffic but I'm not sure about the
traffic that is being encapsulated. My (very) rough idea is to use
something like dummy net or IMQ to provide an interface (or subnet if
need be) that the traffic will traverse and be dequeued from where I
can apply the QoS that I want to. I'm not quite sure how to go about
this so any advice would be greatly appreciated.
I would like to QoS / Prioritize LAN traffic that is destined to the
other LAN based on the type of traffic that it is (ICMP, RDP, RFB,
SMB, etc) before it is encapsulated. Once the traffic has been
encapsulated I'd like to QoS / Prioritize the ESP traffic that is
destined to the other LAN's globally routable IP before any other
internet traffic goes out. This later part is not the problem, just
the former part.
My network layout(s) are below for those of you that will be asking:
Lan A:
- 172.30.12.x/24 subnet
- 172.30.12.1-250 client systems and the likes
- 172.30.12.254 is the default gateway which will be replaced by one
of the boxen I'm asking about.
- A.B.C.Z/24 globally routable IP on the router
Lan B:
- 172.30.13.x/24 subnet
- 172.30.13.1-250 client systems and the likes
- 172.30.13.254 is the default gateway which will be replaced by one
of the boxen I'm asking about.
- A.B.C.Y/24 globally routable IP on the router
VPN:
- The VPN in question will be between the A.B.C.Z and A.B.C.Y globally
routable IP addresses.
Note that both LANs have a DSL circuit from the same provider and thus
are 1 IP off from each other on their globally routable IP.
Grant. . . .
P.S. I'm (cross) posting this to the NetFilter mail lists as I've
seen some very complex questions and answers on the LARTC and
NetFilter mail lists and I would like to pull from both pools of
talent. So be mindful when replying to all. ;)
