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Re: [FW-1] SMTP and Unknown Established TCP packet
Is this a situation in which "reject" is preferable over "drop"? I'm
dropping ident traffic as part of my catch-all rule.
Elisabeth
Don <[email protected]>
Sent by: Mailing list for To: [email protected]
discussion of Firewall-1 cc:
<[email protected] Subject: Re: [FW-1] SMTP and Unknown Established TCP packet
kpoint.com>
03/27/2002 09:58 AM
Please respond to Mailing list for
discussion of Firewall-1
> We found out that SMTP connections to many sites took *long* times to
> establish. We demonstrated that in that particular case the problem was
> lousy service from the ISP, since many sites had problems when
connections
> were attempted. Connections were being dropped (out of state) since it
took
> longer than the "handshake" timeout to start exchanging traffic. We
> worked-around it taking the 60s default timer to 300s, and advised the
> customer to talk to their service provider.
The problems being described here sound exactly like an ident timeout is
causing the problem. Please make sure that you are _rejecting_ ident
traffic to your mail server. If not, some remote systems attempt to
perform an ident lookup, and that reverse connection is dropped by your
firewall. By the time that ident connection times out, and the mail
server goes back to the SMTP session, the connection has also timed out.
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