If you are behind a firewall, you can configure it to only block incoming
traffic on certain ports but still allow outgoing traffic. TCP/IP filtering
on the NIC in NT doesn't give you this flexibility.
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of John Cesta -
Lists
Sent: Monday, August 13, 2001 10:54 AM
To: [EMAIL PROTECTED]
Subject: RE: [IMail Forum] Ports used by IMail.
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Len Conrad
> Sent: Monday, August 13, 2001 10:36 AM
> To: [EMAIL PROTECTED]
> Subject: RE: [IMail Forum] Ports used by IMail.
>
>
>
> >What it means is that we have closed all ports in TCPIP with exception of
> >the standard ports for web, dns, ftp and all the listed ports in the
> >ipswitch knowledge base article. After that we could not send
> mail through
> >the server.
>
> you have to open all outgoing above 1024, since SMTP serevers
> send out the
> high ports to the 25 of the recipient machine.
>
> same idea for DNS unless you use options source-address
hmmm..so there really isn't a chance of actually locking down too many ports
in NT.
John Cesta
>
> Len
>
> http://MenAndMice.com/DNS-training
> http://BIND8NT.MEIway.com : ISC BIND 8.2.4 for NT4 & W2K
> http://IMGate.MEIway.com : Build free, hi-perf, anti-abuse mail gateways
>
>
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>
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