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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [FW-1] Reverse SYN Packet
Here's one I haven't heard of before. We have a pair of FW-1 NG FP2 on Solaris 8 running as a "cluster." They are not load balancing, but HA fail-over only, one "online," one "offline." The firewalls are allowed to FTP to a few external machines. FTP from fw1 works fine. FTPing from fw2, has some problems. The control connection works fine. However, data connections (e.g. when you type 'ls') fail. The failure of the data connections are logged as dropped with the following in the "Info" field, th_flags 2 message_info Reverse SYN packet What the heck is a "reverse SYN packet?" This is a SYN packet from the FTP server, port 20, to the correct address of fw2 at an ephemeral port number. That is, everything looks exactly like it should. So what does "reverse SYN packet" mean, and why is FW-1 erroneously thinking it sees one? My guess here is that there is something weird going on here respect to the state synchronization. Has anyone see this? Anyone have a solution for "reverse SYN packets?" -- Crist J. Clark [email protected] Globalstar CommunicationsThe information contained in this e-mail message is confidential, intended only for the use of the individual or entity named above. If the reader of this e-mail is not the intended recipient, or the employee or agent responsible to deliver it to the intended recipient, you are hereby notified that any review, dissemination, distribution or copying of this communication is strictly prohibited. If you have received this e-mail in error, please contact [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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