dummynet and vr(4)/egress broken in 4.11 ?
Nickolay.Kritsky at astra-sw.com
Tue Feb 1 08:04:40 PST 2005
Are you using ipnat for NAT'ing? If yes, can you post your ipnat rules?
From: Jeremie Le Hen [mailto:jeremie at le-hen.org]
Sent: Sunday, January 30, 2005 5:40 PM
To: freebsd-net at freebsd.org
Subject: Re: dummynet and vr(4)/egress broken in 4.11 ?
> I didn't changed my kernel configuration file so much since my last
> kernel upgrade, I juste added gif(4), IPSEC_FILTERGIF and vr(4).
> I tested using this rule on ingress and egress of both my internal (sis0)
> and external interface (vr0) - inverting IPs where needed :-) - here are
> the results :
> | ingress | egress |
> vr0 (ext) | OK | - |
> sis0 (int) | OK | OK |
> I think that it is now very important to tell you that while upgrading
> my box to FreeBSD 4.11, I also changed my external interface from a 10
> MBits ep(4) to a 100 MBits vr(4).
> I cannot switch back to ep(4) for the moment since it is not an option
> to have downtime, but according to the privous results, I'm pretty
> convinced there is a problem with the vr(4) driver (although I don't
> know how it can impact DUMMYNET). Maybe the last commit on this
> driver in RELENG_4 (sys/pci/if_vr.c, rev 184.108.40.206) is the culprit.
Well, in fact I made further investigation :
- Only TCP seems to be affected. UDP and ICMP appear to work
without packet drop.
- Switching back from my vr(4) to my ep(4) did not resolve the
Thus, it seems this problem is independant from the network driver
(which makes more sense because AFAIK the latters are not involved in
DUMMYNET, as they are in ALTQ for example).
I can still use pipes on interface ingress, internal interface egress,
but it fails when I use a pipe on egress on my external interface _for
packet being forwarded and NATed only_. Weirdly I am still able to
use a TCP stream from the router itself.
I'll give a try to a 4.10 kernel ASAP.
Jeremie Le Hen
jeremie at le-hen.org
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