I havea firewall with shorewall-4-4.17 on Ubuntu 11.04 A system behind that firewall worked well (gets its DHCP params from a DHCP server in the same FW zone fo the system just mentionned, the system gets always the same IP, based on tis MAC address, it''s configured that way) Now I changed the DHCP config so the system gets a different IP (still an IP in the same subnet and also in the same firewall zone as before). Rebooted, OK the system that new IP. But I can''t ping anymore to IP addresses which are not in the same zone as my system. ping just hangs and times out... So, I also can''t do DNS queries any longer (nags and times-out) (the DNS servers I use are in zone ''net'' and in a totally different subnet) I believe somewhere something in a cache on the firewall still has old information, but I have no clue where or how to clear that cache what can be the reason and how to solve? ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d