On 24/04/14 18:24, Alexander V. Chernikov wrote:
On 24.04.2014 01:56, Chris Smith wrote:
On 23/04/14 19:55, Julian Elischer wrote:
On 4/23/14, 4:38 AM, Nikolay Denev wrote:
On Tue, Apr 22, 2014 at 5:37 PM, Harald Schmalzbauer
<h.schmalzba...@omnilan.de> wrote:
Hello,
here, http://svnweb.freebsd.org/base?view=revision&revision=248895
interface route protection was added (so the following problem arose
with 9.2).
Unfortunately, in my case, I must be able to delete these routes;
not in
the default FIB, but in jail's fibs, because:
· Host is multihomed with multiple nics in different subnets.
· Jail's IP (no vnet) is from a different subnet than host's
default-router subnet – jail has no ip in the range of host's
default-router!!!
· FIB used by jail contains valid default-router.
Problem:
If iface-routes exist in jail's FIB, answer-packets take the
iface-shortcut, not trespassing the router (default gateway); hence
3way-handshake never finishes and firewall terminates (half-opened) TCP
sessions.
Workarround:
· Abuse packet filter doing some kind of route-to…
· Revert r248895, to be able to delete v4-iface-routes (inet6-routes
can
be deleted without any hack)
Desired solution:
· Allow deletion of v4-iface-routes if FIB!=0.
Unfortunately my C skills don't allow me to implement this myself :-(
I can't even follow the code, I guess that was originally considered,
but possibly doesn't work bacause of a simple bug?!? I took the lazy
way
and simply reverted r248895 instead of trying to understand
rtrequest1_fib(). I wish I had the time to learn…
Thanks for any help,
-Harry
Hi,
As it was suggested before as immediate workaround you can set
net.add_addr_allfibs=0 so that the interface routes are added only in
the default FIB.
yes, we made two behaviours.
Add interface routes to all active FIBS or only add them to the first
fib and let the user populate other fibs as needed.
It appears you want the second behaviour, so I suggest you use that
option and set up all your routes manually.
Ah, this explains a thing or two.
There is an ongoing work to
1) make fibs/allfibs=0 to work better
2) Move forward to make allfibs=0 as default value.
So when allfibs=0 and an interface is bought up, it's added to the first
FIB automatically (and cannot be removed).
Is there a way to change which fib the interface route is bought up on?
I tried to 'setfib x ifconfig ....' which didn't work.
This will be fixed in near future.
Failing that, is there a way to change the systems global FIB without
having to run every service with setfib? Basically, the behavour I want
is for interface routes to be bought up on NO fibs, and manually add
them to the fibs I need it on.
If ifconfig_ifaceX="fib X inet 1.2.3.4/30" works as expected (changes
interface fib to chosen one and announce interface route and host route
in this particular fib) - does this sound OK to you?
Yes this sounds good.
If I'm not mistaken the interface FIB only makes sense when the system
is routing? Because the issue I have is that SYN ACKs from services are
being routed via the wrong interfaces and interface FIBs do not appear
to affect that.
Allowing interface routes on different FIBs will fix that I think. Or
being able to remove interface routes from a FIB.
In the mean time, I will probably use FIBs (as opposed to vnet) for my
jails, but find a way to run the hosts SSHd with a specific FIB. Any
easy way to do that? Or to specify a system "default FIB" other than 0?
--Nikolay
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