Date: Sat, 19 Jan 2008 03:10:38 +0530 From: wahjava.ml@gmail.com (Ashish Shukla =?utf-8?B?4KSG4KS24KWA4KS3IA==?= =?utf-8?B?4KS24KWB4KSV4KWN4KSy?=) To: Ewald Jenisch <a@jenisch.at> Cc: freebsd-questions@freebsd.org Subject: Re: Anycast DNS - anybody? Message-ID: <87r6geke21.fsf@chateau.d.lf> In-Reply-To: <20080118150214.GA3092@aurora.oekb.co.at> (Ewald Jenisch's message of "Fri\, 18 Jan 2008 16\:02\:14 %2B0100") References: <20080118150214.GA3092@aurora.oekb.co.at>
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--=-=-= Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable >>>>> Regarding Anycast DNS - anybody?; Ewald Jenisch <a@jenisch.at> adds: Ewald> Hi, Ewald> Has anybody out there configured anycast DNS (where multiple ins= tances Ewald> of a DNS-server run under the same IP-address in different parts= of Ewald> the network) under FreeBSD? AFAIK, anycast requires magic at routing level. So that user will connect to the nearest DNS server (holding the anycast address). Ewald> I'm looking for some hints to get started, but googling around d= idn't Ewald> provide much info on that topic... It has do with routing so you need to investigate on routing protocols, like RIP, etc. 192.168.1.1 10.0.0.1 network 10.0.0.2 192.168.1.1 [server1] --- [router1] =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D [router2] --- [server2] router1, router2 -- redundant routers connecting to different ISPs So if router2 receives packet destined for 192.168.1.1, instead of sending = to server1 it'll send it to server2, since server2 is nearest to it, and vice versa. Above is a very simple configuration describing anycast. Since Anycast works only for connection-less protocols, you don't need to keep TCP connections synchronized between two servers, although both ser= vers should behave identically, i.e. return similar records. BtW, I've never implemented anycast ever, so its fully based on my imaginat= ion. HTH =2D-=20 Ashish Shukla =E0=A4=86=E0=A4=B6=E0=A5=80=E0=A4=B7 =E0=A4=B6=E0=A5=81=E0=A4= =95=E0=A5=8D=E0=A4=B2 http://wahjava.wordpress.com/ =C2=B7-- =C2=B7- =C2=B7=C2=B7=C2=B7=C2=B7 =C2=B7--- =C2=B7- =C2=B7=C2=B7=C2= =B7- =C2=B7- =C2=B7--=C2=B7-=C2=B7 --=C2=B7 -- =C2=B7- =C2=B7=C2=B7 =C2=B7-= =C2=B7=C2=B7 =C2=B7-=C2=B7-=C2=B7- -=C2=B7-=C2=B7 --- -- --=-=-= Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFHkRzaHy+EEHYuXnQRAhtVAKDWqY4wtfpFW3BdYa55w7zsoAg7sACgvu4F U62oTUxRGhXcQn8WABZPQLc= =kUly -----END PGP SIGNATURE----- --=-=-=--
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