[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [FW-1] Trcaert on NG FP2
"Singh, Hira" wrote: > > Dear Clark, > Can you please explain this a little bit. > I am not sure how to do it.....do i need to create a rule for this. Yeah, you would create a rule. You don't really need 'from any to any,' a slightly safer way to do it is, From: To: Service: Action: (External Networks) (Protected Networks) icmp-time-exeeded Accept Just allow ICMP 11's in from the outside. As others have stated, FW-1 is supposed to be able to handle these in a stateful way. Since that is already known to be broken to some degree, the above still might not work in a NAT'ed environment. I would the problem has to do with the fact that the time exceeded messages are generated by the routers in between you and the destination. The packets coming back do not have the source address equal to the destination of your probes. The stateful inspection and NAT code has to look at the ICMP payload, which contains a portion of the packet that caused the error messsage, to see if it is part of a "connection" it is keeping track of. Something in that code is broken. Whether it affects stateful inspection, NAT, or both, I don't know. -- 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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