On Fri, Aug 03, 2012 at 10:19:07AM +0200, BBS Technik wrote: > > # allow to connect FROM your ubuntu > Port 25 (SMTP) should also be allowed (confirmation mail, ... ) . No, it should not. Sending mail via smtp is connection initiated by Ubuntu. It does not come from out side, so it is handle by following rules: - SYN initiating connection to SMTP server: > > iptables -A INPUT -p tcp --syn -m conntrack --ctstate NEW -j TCP - any packet belong to connection initiated by SYN: > > iptables -A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT -- Jakub Skory, <kuba(at)ukw(dot)edu(dot)pl> System Operator IT Center: _______________________________________________________________________ tel: +48 52 3257 649, +48 52 3257 647 fax: +48 52 3257 646, +48 52 3257 647 working hours: 08a.m. - 04p.m. mail: di(at)ukw(dot)edu(dot)pl web: http://di.ukw.edu.pl/ postal address: M. Kopernika 1 (room 8/9), 85-074, Bydgoszcz. _______________________________________________________________________ Kazimierz Wielki University, J. K. Chodkiewicza 30, 85-064, Bydgoszcz, Poland. _______________________________________________________________________
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