Date: Wed, 12 Sep 2007 14:49:44 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-hackers@freebsd.org Subject: Re: TCP/IP redundant connections Message-ID: <fc8n99$1cu$1@sea.gmane.org> In-Reply-To: <f84a63260709110733n759224e4ufb475d9e7986da9d@mail.gmail.com> References: <f84a63260709110733n759224e4ufb475d9e7986da9d@mail.gmail.com>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigBAA28A362493814AD72FBA79 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable Artem Kazakov wrote: > So I want to utilize IP-sharing and TCP-connection synchronization > (which is not yet implemented by anyone as far as I know). I want it > in case of failure seamlessly to switch to the other machine. As far > as the internal state is synchronized, if it is possible to > synchronize open connections as well(and all the low level stuff as > packet sequence numbers and so on) it would allow to make switch-over > to the back-up server in a matter of seconds, and the clients would > stay connected. I don't know if you already considered this, but the above looks like=20 both machines would simultaneously process a single TCP connection. So,=20 when a TCP connection request (handshake) arrives, you want both of the=20 machines to respond? Further on: You'll confuse the remote application and waste bandwidth if = you send two responses to every TCP packet you receive. And on: What about the applications running on the two machines: if the=20 remote client send e.g. a request to delete a resource (just an=20 example): would both servers receive and respond to the request? etc, etc. Have you read the manual for carp(4) and why isn't CARP good enough for=20 what you need? --------------enigBAA28A362493814AD72FBA79 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (GNU/Linux) Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org iD8DBQFG5+BoldnAQVacBcgRAy7XAJ4o0zli6gEEQe/EPkGzoPARhcM6yACbBLvc iO+GYZnleStHRrfpsVWtnyw= =2PlV -----END PGP SIGNATURE----- --------------enigBAA28A362493814AD72FBA79--
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