Port forward utility legit install#
Port forward utility legit driver#

Rdr pass on $externalif proto tcp from ! to $externalif port smtp -> 127.0.0.1 port 8025 Rdr pass on $externalif proto tcp from to $externalif port smtp -> 127.0.0.1 port 8025 Rdr pass on $externalif proto tcp from to $externalif port smtp -> 192.168.10.11 port smtp # 'Redirect' is OpenBSD PF-speak for Port Address Translation (PAT). # depending on which PF table the sender's IP address is in. # Redirect SMTP traffic to either our local spamd or the real mail server, Table persist from $dmznet to any -> $externalif

# We will use this table to block these IP addresses in a later rule # Here are addresses we should never see from the Internet If you understand what port forwarding, NAT, and stateful firewalling are, the following file should make sense. Next up is /etc/pf.conf, which I wrote from scratch. The spamd man page will tell you about the rest. The pf_rules line should already be there, but if it isnвЂ™t, put it in. The -v parameter tells spamd to log verbosely, so that when we send email to someone, that recipient gets automatically whitelisted. With a change to the -G parameter for spamd_flags I bumped it up to 60 minutes, since 25 minutes proved to be a bit too short in actual practice. The default time for the initial greylist quarantine is 25 minutes. But itвЂ™s easy enough to correct by running chown _spamd:_spamd /var/db/spamd. I suspect that the OpenBSD team already knows about this and that it will be fixed in a future version, given that their spamd man page mentions the permissions issue. However, that file needs to be owned by the spamd processвЂ™s owner, which is _spamd. Issue the command touch /var/db/spamd, which, of course, makes the owner root:wheel. You will, as root, need to create a file that is not present in the default install, namely /var/db/spamd. Change the existing lines with these settings so that they now look like the following:

etc/rc.conf controls several boot-time settings. ItвЂ™s the built-in 10/100 NIC in nearly all Sun Ultra boxes.

Port forward utility legit driver#

I have an fxp0 and a fxp1 because I have two Intel EtherExpress Pro/100B cards that use the fxp driver - equivalent to eepro100 in Linux, and an hme0, which stands for - no, IвЂ™m not kidding - Sun Happy Meal Ethernet. etc/nf - the default is pretty good, but you can make tweaksДЄ note about interfaces on any of the BSDs: Unlike GNU/Linux, which has eth0, eth1, eth2, and so on, *BSD interfaces are named by which device driver they take. etc/pf.conf - the PF ruleset mandatory for anything to work You can make the changes to /etc/rc.conf.local, if you prefer that instead the settings in that file override the defaults in /etc/rc.conf. etc/rc.conf - the system-wide config file.

Port forward utility legit install#

Once you install and set up the IP addresses on the OpenBSD box, you need to edit three files: It runs Postfix and Dovecot in a maildir configuration, and uses a private IP address of 192.168.10.11. ItвЂ™s another Sun Ultra 5 box running Ubuntu GNU/Linux 6.06 Dapper Drake.

fxp0, the inside вЂњtrustedвЂќ interface, and.

It is a 270MHZ Sun Ultra 5 with 256MB DRAM and a 20GB disk /var, which holds my logs, is 4GB in size. вЂњspamslayerвЂќ is the OpenBSD box running the spamd tarpit/greylister, as well as a stateful packet-filtering firewall. I used the physical layout shown in the figure. PF rules (OpenBSDвЂ™s version of iptables) take care of that. But we also must tell OpenBSD to forward email from вЂњgoodвЂќ senders to our real email server.

Tell OpenBSD to send any TCP 25 traffic to spamd for evaluation (yes, that is a required step).

Decide on a physical hookup and IP addressing scheme.

Now that we know some of its advantages, letвЂ™s put it to work. Yesterday we looked at spamd, a service designed to reduce the flow of spam to your email inbox.