Since you're running an e-commerce site then users probably establish
sessions which are dynamic in nature, passwords, logins etc. If you
need failover capabilities you need to consider that if a failover did
occur, you'd want active, open sessions statefully failed over to the
backup server. I'd be pretty pissed if I was in the midst of a high
dollar transaction and my session died on me. Things could get pretty
complicated there. The only way I know of achieving that sort of
capability is by doing clustering. Since your application is already
installed and running, then a cluster solution is more difficult to
engineer. Anyway this is way out of my league.
I respectfully bow my way out of this thread to make way for someone
more versed in this arena. :-)
Vijay Ramcharan
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
Daniel Wilson
Sent: Thursday, June 07, 2001 10:42 AM
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/
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=7532&t=7511
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