To followup on this question I have updated my sysctl settings, changed pf.conf and added the scrub out line recommended.
Also my dist is 4.3 openbsd flashdist. (not 4.2) Result of all changes proposed: No change. Pages like http://marc.info etc still time out. updated settings are: ------------------------------------------------------------------------------------ # $OpenBSD: pf.conf,v 1.28 2004/04/29 21:03:09 frantzen Exp $ # # See pf.conf(5) and /usr/share/pf for syntax and examples. # Remember to set net.inet.ip.forwarding=1 and/or net.inet6.ip6.forwarding=1 # in /etc/sysctl.conf if packets are to be forwarded between interfaces. ext_if="pppoe0" int_if1="vr1" int_if2="vr2" int_if3="vr3" out_net="192.168.11.0/16" # Private networks, we are going to block incoming traffic from them priv_nets = "{ 127.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12, 10.0.0.0/8 }" netbios_ports = "{ 135, 137, 138, 139, 445, 1433 }" #table <spamd> persist #table <spamd-white> persist set block-policy return scrub in all scrub out on pppoe0 max-mss 1440 nat on $ext_if from $int_if1:network to any -> ($ext_if) nat on $ext_if from $int_if2:network to any -> ($ext_if) nat on $ext_if from $int_if3:network to any -> ($ext_if) # block all # block incoming traffic from private networks on external interface block drop in quick on $ext_if from $priv_nets to any # block outgoing traffic to private networks on external interface block drop out quick on $ext_if from any to $priv_nets pass quick on lo0 all pass out on $ext_if proto tcp all keep state pass out on $ext_if proto { udp, icmp } all keep state pass in inet proto icmp all icmp-type echoreq keep state pass out inet proto icmp all icmp-type echoreq keep state pass in on $int_if1 from $int_if1:network to any keep state pass in on $int_if2 from $int_if2:network to any keep state pass in on $int_if3 from $int_if3:network to any keep state pass out on $int_if1 from any to $int_if1:network keep state pass out on $int_if2 from any to $int_if2:network keep state pass out on $int_if3 from any to $int_if3:network keep state #---------------------------------------------------------------- #DEFAULT openbsd flashdist sysctl values #---------------------------------------------------------------- sysctl -w net.inet.ip.forwarding=1 sysctl -w net.inet.tcp.mssdflt=512 sysctl -w net.inet.tcp.recvspace=16384 sysctl -w net.inet.tcp.sendspace=16384 sysctl -w net.inet.udp.recvspace=41600 sysctl -w net.inet.udp.sendspace=9216 --------------------------------------------------------------------------- MISC STARTUP SCRIPT --------------------------------------------------------------------------- pfctl -d ifconfig pppoe0 inet 0.0.0.0 netmask 255.255.255.255 broadcast 0.0.0.1pppoedev vr0 \ authproto pap authname USERNAME authkey PASSWORD up route add default 0.0.0.1 echo pppoe setup done # #nics # ifconfig vr0 up ifconfig vr1 inet 10.0.0.1 netmask 255.255.255.0 ifconfig vr2 inet 172.16.0.1 netmask 255.255.255.0 ifconfig vr3 inet 1.2.3.1 netmask 255.255.255.0
