routing LAN traffic through/around a pf gateway
kristof at sigsegv.be
Fri Jan 25 00:32:02 UTC 2019
On 25 Jan 2019, at 9:37, James B. Byrne via freebsd-pf wrote:
> I have limited knowledge of PF being in the process of transitioning
> from 20+ years of RHEL/CentOS to FreeBSD. Neither do I possess a
> great fund of knowledge respecting IP routing. That said this is my
> On a small test LAN I have three hosts, W44, W4 and G5:
> network layout, gateway address 126.96.36.199
> W44 G5 w4
> 188.8.131.52 ----> 184.108.40.206 220.127.116.11 int_if IP
> 192.168.150.44 192.168.150.5 ----> 192.168.150.4 int_if IP alias
> Using ssh and with PF running on the gateway, when I connect from
> 18.104.22.168 to 22.214.171.124 then the ssh session operates normally.
> However, if instead I connect from 126.96.36.199 to 192.168.150.4 then
> the initial connection is made but the ssh session remains responsive
> for a brief time before it becomes non-responsive. If I terminate the
> PF running on the gateway the ssh session again becomes responsive.
> If I do not terminate PF then eventually the ssh session client
> disconnects with a timeout error.
> Besides macros the entire active contents of pf.conf on G5 are:
> scrub in all no-df max-mss 1440 fragment reassemble
> block return out log all
> block drop in log all
> pass log on $int_if
> pass inet proto icmp all \
> icmp-type $icmp_types keep state
> pass out quick on $ext_if inet proto udp \
> from any \
> to any port 33433 >< 33626 keep state
> Which results in these rules when PF is running:
> @0 scrub in all no-df max-mss 1440 fragment reassemble
> @1 block return out log all
> @2 block drop in log all
> @3 pass log on em0 all flags S/SA keep state
> @4 pass inet proto icmp all icmp-type echoreq keep state
> @5 pass inet proto icmp all icmp-type unreach keep state
> @6 pass out quick on em1 inet proto udp from any to any port 33433 ><
> 33626 keep state
You don’t appear to have a rule permitting the SSH traffic to pass
through your router.
I’m a more than little surprised you manage to establish a connection
in the first place.
Unless the connection existed before you started pf, of course.
Try adding something like:
pass inet porto tcp port 22
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