[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [FW-1] SMTP and Unknown Established TCP packet
Thanks Don, Sorry for late reply. Came back today after 4day holiday. I tried your suggestion. but I dont think it was the issue. I did a any any ident reject long Infact I see only very few ident packets. So the delay probably lies somewhere else. I will try increasing my tcptimeout to around 300 seconds tonight and see. may be that will do some good. Nishan Don <[email protected]> Sent by: Mailing list for discussion of Firewall-1 <[email protected]> 03/27/2002 09:58 PM Please respond to Mailing list for discussion of Firewall-1 To: [email protected] cc: (bcc: subscriptions/ITD/GHO/DFCC) Subject: Re: [FW-1] SMTP and Unknown Established TCP packet > 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. ... > Who knows, maybe you are experiencing that same problem. Let us know how it > went! 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. Just an idea. -don ================================================= To set vacation, Out Of Office, or away messages, send an email to [email protected] in the BODY of the email add: set fw-1-mailinglist nomail ================================================= To unsubscribe from this mailing list, please see the instructions at http://www.checkpoint.com/services/mailing.html ================================================= If you have any questions on how to change your subscription options, email [email protected] ================================================= ================================================= To set vacation, Out Of Office, or away messages, send an email to [email protected] in the BODY of the email add: set fw-1-mailinglist nomail ================================================= To unsubscribe from this mailing list, please see the instructions at http://www.checkpoint.com/services/mailing.html ================================================= If you have any questions on how to change your subscription options, email [email protected] =================================================
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