Fail-over

[Boyack, Kurt]

Norman Zhang writes:
> Hi,
>=20
> I've a dual WAN router, currently some of my servers are=20
> bound with static IPs to ISP1. I like them to remain=20
> available on ISP2 if ISP1 goes down. Do I need dynDNS service=20
> for this? Or I can type in 2 different IPs for 1 serivce.
>=20
> e.g.,
>=20
> 1.2.3.4 IN www.example.com #ISP1
> 2.3.4.5 IN www.example.com #ISP2.
>=20
> But internet may still resolve to 1.2.3.4 despite ISP1 being=20
> down. May I ask what the best way to go about this?
>=20
> Regards,
> Norman Zhang
>=20

Probably the best way to do this would be to do BGP to both of the ISPs.
With BGP, people will be able to get to your servers (with ISP1 IP
addresses) through ISP2 when ISP1 is down.