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Posted by Wolfgang Kueter on May 17, 2007, 3:15 am
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jhunsky wrote:
> I need to secure my network. I would like to prevent SMTP from leaving
> my network unless it comes from one specified server( email server).
OK, that is normally a pretty easy task.
> This should prevent my network from becoming a zombie of spams. How to
> I go about this?
create the following ruleset for your packet filter (whatever device that
is):
from to service/port protocol action
-------------------------------------------------------------------
email_server any smtp 25 tcp allow
LAN any smtp 25 tcp log + deny
> Will protocol binding do?
Packet filtering will do.
> How do I test if it works?
try connecting to external SMTP Servers from the workstation, look what
happens and watch the logfile.
Wolfgang
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