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VPN client cannot connect through OpenBSD router/firewall



Okay. I have a problem that I can't get my brain around and I need some help. My wife needs to connect to her VPN at work. I've captured packets for her connection and see that it's connecting to her work server on ports 53 (dns) and 500 (isakmp).

I have been doing a lot of reading (Artymiak, OpenBSD PF Manual) and searching (Google and Archives), but I'm still not understanding something I guess.

I thought that since she was initiating the connections to port 53 and 500 that the keep state entries on the outbound tcp and udp traffic would be enough to ensure she could connect and wouldn't require me to set up NAT for these connections. Am I wrong? What am I missing here?

Thank you for any help. My pf.conf is below.

rvb

#=================================
# Macros
#=================================
log_flg = ""			# "log" for on and "" for  off

ext_if  = "fxp0"
dmz_if  = "xl0"
int_if  = "xl1"

dmz_ip  = "192.168.2.199"
win_ip  = "192.168.3.100"

#=================================
# Port Nbr Mapping
#=================================
ssh     = "22"
ident   = "113"
irc_dcc = "1024:1066"
web_svr = "80"
tomcat  = "8080"

tcp_services = "{" $ssh "}"

icmp_types = "echoreq"

priv_nets = "{ 127.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12, 10.0.0.0/8
}"

#=================================
# Options
#=================================
set block-policy drop
set loginterface $ext_if

#=================================
# Scrub Rules
#=================================
scrub in all

#=================================
# NAT and Forwarding Rules
#=================================
nat on $ext_if from $int_if:network to any -> ($ext_if)
nat on $ext_if from $dmz_if:network to any -> ($ext_if)

prefix_ext = "rdr on" $ext_if "proto tcp from any to" $ext_if "port"

$prefix_ext $web_svr -> $dmz_ip
$prefix_ext $tomcat -> $dmz_ip
$prefix_ext $ident -> $win_ip
$prefix_ext $irc_dcc -> $win_ip


# lan traffic to web server rdr on $int_if proto tcp from any to $ext_if port $web_svr -> $dmz_ip

# lan traffic to servlet engine
rdr on $int_if proto tcp from any to $ext_if port $tomcat -> $dmz_ip

#=================================
# Filter Rules
#=================================

block all

pass $log_flg quick on lo0 all

antispoof $log_flg quick for $ext_if
antispoof $log_flg quick for $dmz_if
antispoof $log_flg quick for $int_if

block drop in $log_flg quick on $ext_if from $priv_nets to any
block drop out $log_flg quick on $ext_if from any to $priv_nets

# tcp_services
pass in $log_flg on $ext_if inet proto tcp from any to ($ext_if) \
   port $tcp_services flags S/SA keep state

# web server
pass in $log_flg on $ext_if proto tcp from any to $dmz_ip port $web_svr \
   flags S/SA synproxy state

# servlet/jsp engine
pass in $log_flg on $ext_if proto tcp from any to $dmz_ip port $tomcat \
   flags S/SA synproxy state

# ident requests
pass in $log_flg on $ext_if proto tcp from any to $win_ip port $ident

# dcc send
pass in $log_flg on $ext_if proto tcp from any to $win_ip port $irc_dcc

# ping requests
pass in $log_flg inet proto icmp all icmp-type $icmp_types keep state

# pass out all tcp, udp, and icmp packets
pass out $log_flg on $ext_if proto tcp all modulate state flags S/SA
pass out $log_flg on $ext_if proto { udp, icmp } all keep state

# pass all traffic to the dmz
pass in $log_flg on $dmz_if from $dmz_if:network to any keep state
pass out $log_flg on $dmz_if from any to $dmz_if:network keep state

# pass all traffic to and from the local network
pass in $log_flg on $int_if from $int_if:network to any keep state
pass out $log_flg on $int_if from any to $int_if:network keep state