I have a linux router with 2NIC plus with iptables firewall and snort....eth0 is connected to my ADSL modem...and eth1 connected to my DI-714P+ router at WAN port by using cross cable. DI-714P+ is D-Link wireless router.
1-My problem is...my wireless client cannot send email with attachment...
2-I try to connect directly from eth1 to a single pc ( XP ), and try to send email with attachment using Outlook Express...it succesfull..
3-When I try to connect the ADSL modem to D-Link router dirextly and try to send email attachment from wireless client...it succesfull...
3-I think my firewall is ok because i already open port for outgoing email in the firewall setting like below:
OPEN_TCP="20 21 110 143"
OPEN_UDP="20 21 110 143"
I use arno-iptables-firewall-1.8.2a-stable.tgz