On Fri, August 7, 2009 12:07, James B. Byrne wrote: > I am setting up a small CentOS-5.3 host to act as a router. I have > the device configured and working. What I am trying to accomplish > now is configuring the firewall so as to protect both the router and > the LAN. Thank you for the replies. I have been reading about iptables all weekend and have clarified a number of misconceptions that I had. I have a few specific questions wrt rp_filter. Is this set anywhere in the startup scripts that ship with CentOS? If so then where? How would one best configure this setting or should it be left off, as I believe that it is by default? Does it make any sense to enable this on the eth0 i/f given that eth0 is the WAN i/f? Sincerely, -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB at Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3