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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>>>>> 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/
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