Date: Fri, 31 Mar 2006 02:25:47 -0500 From: Christopher McGee <chris@xecu.net> To: freebsd-pf@freebsd.org Subject: Re: Traffic mysteriously dropping Message-ID: <442CD97B.2050103@xecu.net> In-Reply-To: <442CD1E7.9030803@xecu.net> References: <442CD1E7.9030803@xecu.net>
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Christopher McGee wrote:
> I have 2 firewalls using all "em" network cards. They have 2 onboard
> Intel Gigabit interfaces and 1 quad port intel pro1000MT in each
> firewall. They are currently using both of the onboard interfaces and
> 2 of the interfaces from the pci cards. The firewalls are running
> carp and pfsync for failover. They are managing traffic for a gigabit
> link and they usually don't push more than 150-200 Mbit/s and that is
> rare. Some http traffic is mysteriously just disappearing, even at
> times when the firewalls are not busy(only 3-4 Mbit/s of traffic).
> I've tested this, and the traffic is reaching the firewall(inbound to
> our network) and hits pf and seems to be passing but then just never
> makes it out the other interfaces(although pf does not log any blocked
> packets). The client will resend SYN packets until the connection
> eventually just times out. This timeout is happening on approximately
> 1 out of 25 connections.
> Here is how I fixed this temporarily:
> I moved the rule for the http traffic to the FIRST rule of pf.conf and
> make it a quick rule and bidirectional(stateless), it works and
> doesn't seem to drop any connections.
>
> I have a fairly extensive ruleset, 378 rules to be exact when they are
> all loaded. I am using if-bound states. If I make these rules
> stateful, or move them down even one or 2 lines in the list of rules,
> they start dropping connections again. Hopefully someone can help
> with this.
>
> Chris
A quick follow up since I realize I left out a little detail. I have
tried this on 5.4-RELEASE-p8 and 6.0-RELEASE-p6. I've been trying to
get altq working properly also, but it's been disabled until I work out
the above problem.
The problem I've had with altq is trying to implement hfsc on the 6.0
firewall. I thought it was a pretty simple configuration. I want to
limit outgoing traffic to 100Mbit/s and have one queue higher priority,
with a guaranteed 3 Mb of bandwidth, and a second lower priority queue
with no guaranteed bandwidth. The 2 queues should share the 97Mb of
spare bandwidth evenly when the firewalls are busy, and queue2 should
not be allowed to exceed 95Mb ever. This is what I put together but it
errors:
altq on $ext_if bandwidth 100Mb hfsc queue { queue1, queue2 }
queue queue1 priority 3 hfsc(realtime 3Mb linkshare 50% default red)
queue queue2 hfsc(upperlimit 95Mb linkshare 50% red)
I get the following error:
pfctl: the sum of the child bandwidth higher than parent "root_em0"
These 2 problems, are making pf, virtually unusable for our firewall
needs. Hopefully there is a fix for them.
Chris
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