[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [FW-1] DNS TCP
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Generally 53/TCP is used for dns zone transfers and 53/UDP is used for normal dns queries. Michael S. Hobbs A+, MCP Unicon, Inc. OfficeMobileFax- -----Original Message----- From: Mailing list for discussion of Firewall-1 [mailto:[email protected]] On Behalf Of Don Sent: Thursday, May 09, 2002 9:47 AM To: [email protected] Subject: Re: [FW-1] DNS TCP > Could someone give me a security explanation on the good, bad, need or not > need to open up TCP port 53 to the outside world. Is there a need for TCP > 53, if it should be open to whom (local ISP???), is there EVER a need for > it, if so when and why? Please see the message archives from a week or so ago. TCP 53 should be allowed into your name server. It is part of the RFC for DNS. Please see RFC 1035. How often does TCP 53 get used for normal DNS queries? Not often but it would be a good idea to allow it rather than brak things in unexpected ways. Also, considering the insecurity of most DNS implementations just allowing UDP queries through is a bad idea. It probably makes the most sense to put your DNS server in front of the firewall so when it gets compromised, you do not have to worry about your other systems :) - -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] ================================================= -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use <http://www.pgp.com> iQA/AwUBPNquaylHPLksEJRBEQJFKQCfawfL5XzK5RV3Dd4iTpsE7m11GJ4AoM6h Xe+g9RFV4sxrAWFfnzEklFbW =O3bJ -----END PGP SIGNATURE----- ================================================= 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] =================================================
|