pf reply-to tcp connections stall

[Vlad GALU]

On 5/20/08, Cristian Bradiceanu <cbredi at bofhserver.net> wrote:
> On Tue, May 20, 2008 at 7:20 PM, Jeremy Chadwick <koitsu at freebsd.org> wrote:
>  > On Tue, May 20, 2008 at 06:30:58PM +0300, Cristian Bradiceanu wrote:
>  >> I am trying to set up split routing on two Internet links, each with
>  >> one IP address:
>  >>
>  >> em0 = wan1, $em0_gw gateway
>  >> em1 = lan, NATed on em0 and em2
>  >> em2 = wan2, default gateway
>  >>
>  >> pass in on em0 reply-to (em0 $em0_gw) inet proto tcp from any to em0 flags S/SA keep state
>  >> pass in on em0 reply-to (em0 $em0_gw) inet proto udp from any to em0 keep state
>  >> pass in on em0 reply-to (em0 $em0_gw) inet proto icmp from any to em0 keep state
>  >>
>  >> wan2 connections are working correct, no pf rules for policy routing
>  >>
>  >> wan1 tcp connections to IP of em0 (e.g. ssh) stall when a large amount
>  >> of data is sent (e.g. running dmesg or cat file). States are created
>  >> correctly. When ssh stalls there are some icmp packets out on lo0 with
>  >> source and destination ip address of em0, which I believe is not
>  >> correct (set skip on lo0 does not help). Also tried with tcp ...
>  >> modulate state but same result.
>  >
>  > modulate state is known to be broken:
>  >
>  > http://wiki.freebsd.org/JeremyChadwick/Commonly_reported_issues
>  >
>  > Regarding the "when large amounts of data is sent, the connection
>  > breaks" issue:
>  >
>  > I've reproduced this a few times on our systems (using the exact same
>  > method you do: dmesg, cat'ing large files, or scp'ing -- anything using
>  > large TCP packets), and it's always been caused by improper pf(4) rules
>  > where state was broken.  In every case, the "state mismatch" counter
>  > shown in pfctl -s info would increase.
>
>
> state-mismatch counter does not increase, all "Counters" are 0 except
>  match (pfctl -si).  When large amounts of data is sent the connection
>  stalls and continues from time to time very slow; when it continues
>  there are logged icmp packets out on lo0 from (em0) to (em0) which
>  looks pretty weird to me.
>
>
>  Cristian

    This may be a PMTUD issue. Make sure your ICMP packets can travel
back and forth unhindered and that there are no scrub rules that may
clear out the DF flag on them.

>
> _______________________________________________
>  freebsd-pf at freebsd.org mailing list
>  http://lists.freebsd.org/mailman/listinfo/freebsd-pf
>  To unsubscribe, send any mail to "freebsd-pf-unsubscribe at freebsd.org"
>


-- 
~/.signature: no such file or directory