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I am in the same position as you, we are just about to get an
additional T1, and then move the current and new T1 into a 3640.
The ISP that is managing it for us says that BGP will do the job. I
don't know much at all about BGP (although am studying now) but I
think it will work.
I am uncertain as to the best way to do it however.
I also looked at DNS round robin, and it will work, but it is a lot
uglier than using one address range and BGP. If you use DNS RR, then
when a client does a lookup, it will recieve all A records, and will
try one then the other, so there isn't that much of an issue. I don't
think it is robust enough for e-commerce sites that demand high
availability though, which is why we are going to BGP.
I will keep you updated as we go through the implementation.
Symon
- -----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf
Of
Daniel Wilson
Sent: 07 June 2001 15:42
To: [EMAIL PROTECTED]
Subject: Re: BGP for 2 T1's to one LAN [7:7511]
The quick responses on this group are great! Thanks for the help so
far.
The content is not static. The sites in question run e-commerce. We
could
look at
setting up access from both servers to the same DB server over an
internal
network ...
so that would answer that objection to the solution you offered.
I started by asking questions on a different group about round-robin
DNS.
What I was
told was that since we don't control anyone else's DNS caching
settings (our
TTL entries
etc. are really only suggestions) that when one T1 goes down & we
change the
DNS
settings to point to only the other line clients & other DNS servers
would
still try to
access the downed T1. Is this accurate as far as you know? If round
robin
DNS will
provide fault-tolerance, that's great. If not ... we need to look
elsewhere.
Thanks!
- --
Daniel Wilson, BSCS, MCP
Application Developer
http://www.compusoftsolutions.com/
Vijay Ramcharan wrote:
> I believe what you're looking for is a way to load balance traffic
> to your web servers. You also wish to achieve a degree of fault
> tolerance in case one server goes down. If both servers have the
> same content and the content is static, you could use a feature
> called DNS round-robin which basically returns a list of IP
> addresses to a querying client for any single hostname. If one
> server becomes unavailable the client can use the other IP
> addresses given by the DNS server to access the same site. There's
> no routing protocol involved here and I don't think it's possible
> to do what you need using a routing protocol. The good thing about
> DNS round-robin is that the IP addresses of the web servers could
> be totally unrelated.
> This seems to be more of an application specific need for fault
> tolerance. If this is possible using a routing protocol I'd be
> happy if someone pointed out the error of my ways. I'm always open
> to
> suggestions.
>
> Vijay Ramcharan
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On
> Behalf Of Daniel Wilson
> Sent: Thursday, June 07, 2001 9:39 AM
> To: [EMAIL PROTECTED]
> Subject: BGP for 2 T1's to one LAN [7:7511]
>
> We are trying to have the web servers in our LAN accessible to the
> internet via 2 T1's from different providers -- more for redundancy
> than
>
> load sharing, though that matters too. Currently we have 2 T1's,
> each giving us a different set of IP addresses. That just lets us
> put some sites on each T1 -- doesn't give us an ounce of
> redundancy.
>
> I've been told that if we get a router with 2 WIC's that can speak
> BGP (Cisco 2600 or better) that may solve our problem. I'm very
> new to routing, so can someone answer some basic questions?
>
> Is the idea with this solution that we will be running just one set
> of IP addresses? And that, because of BGP on our router, either
> ISP will be able to route traffic to that set of IPs on the T1 it
> provides?
>
> Thanks in advance.
>
> --
> Daniel Wilson, BSCS, MCP
> Application Developer
> http://www.compusoftsolutions.com/
[EMAIL PROTECTED]
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