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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [FW-1] DNS Question
Ah, I see it now, when the response is too large to fit in UDP packets, the resolver is supposed to try a TCP connection instead. (Assuming the DNS server responds indicating that the response is too large) I've never seen this happen, though. It sounds like the problem here is possibly a timeout issue, since the original post implies that the response does get through if it is tried again. If it were an issue with the size of the response, it would never get through. I have seen this happen from time to time, where a query fails, and then succeeds if it is tried again immediately. I've always suspected that it is simply a case where the answer takes a bit to come back, and the resolver times out. -----Original Message----- From: Don [mailto:[email protected]] Sent: Thursday, May 02, 2002 8:08 AM To: [email protected] Subject: Re: [FW-1] DNS Question > 53-TCP is used for zone transfer should be secured 53-UDP can be open to > all. TIP. This is not correct. Please read my post below. -Don > >>>After all the IPSO upgrades and service pack upgrades for our > >>>Nokia/Checkpoint 4.1 SP5a solution, we started seeing some random > >>>results with our DNS servers. Sometimes, it would fail on the first > >>>lookup - but after that it would be ok... my question is simple... for > >>>the last several years we've had the simple 2 rules for our DNS Servers: > >>> > >>>1. Any (Source) DNSServers(Destination) DNS-53(Port) > >>>2. DNSServers (Source) Any (Source) DNS-53 (port) > >>> > >>>The question is simple...are we missing something obvious??? Our DNS > >>>servers are Windows 2000. > >>> > >>When you say DNS-53, do you mean UDP or TCP? You need to allow both in > >>order for DNS to function properly. Most DNS requests use UDP port 53, > >>however larger requests use TCP port 53. It may be these larger requests > >>that are failing. > >> > >>-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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