hi!
go to cco and do search on bgp multihoming. you will see there are some
pretty good documents on it.
Dragi
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""Daniel Wilson"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> 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, eac
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 basical
I am reading Bassam Halabi at the moment, this has the information you
require.
Also think about who's address space you are using? ie. one of the 2 ISP's?
or your own?.
If you are using one of the ISP's address block, then maybe you will need to
NAT on the other router? This might blow your load
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
I'll take a stab at some of this ...
First - If I recall, and I may very well be wrong here, I though DNS
round-robin was solely for load-sharing, not redundancy.
Second - Regarding BGP multi-homing ... some "gotchya's" that we ran into:
You will need an ASN
Some ISP's have ne
Daniel,
We've done something very similar to this by putting active/standby load
balancing devices in an ISP. Your URL then points to a VIP on the load
balancing device. The device then health checks your two sites and load
balances accordingly.
If the ISP dies then, yes you'll lose both sites, b
f
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
The answer is: It depends. :)
When you make use of round robin DNS your clients do recieve multiple
records. This is from a single hit to www.microsoft.com and shows the dns
cache on the local machine.
www.microsoft.com.
--
Record Nam
> If the ISP dies then, yes you'll lose both sites, but the world is a single
> point of failure.
Unfortunately, all the ISP's we've worked with are much more likely to fail
than the
world is or the Internet at large is. Both ISP's we have now (names
withheld to protect
the guilty) have bad habi
--
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
64/26 with a metric of 10.
>>>Brian
>From: "Symon Thurlow"
>Reply-To: "Symon Thurlow"
>To: [EMAIL PROTECTED]
>Subject: RE: BGP for 2 T1's to one LAN [7:7511]
>Date: Thu, 7 Jun 2001 17:07:05 -0400
>
>-BEGIN PGP SIGNED MESSAGE-
>Hash:
Redundancy and loadbalancing are possible. The hardware is insufficient,
though.
Redundcy and Load balancing requirements.
--
2 ISPs
2 /24
ASN
Two routers capable of 256 Mb of DRAM (3600 and higher)
web servers with two IPs, from each block
DNS round robin
Redundancy only
--
2 ISPs
1 /24
ASN
Two
Thanks. Someone else also mentioned the need for 2 routers for full
redundancy. What
I'm not understanding is why we need to IP blocks to achieve loadbalancing.
That we'd
need DNS round robin if we're running 2 blocks makes sense, but why the 2
blocks? Also,
are both your lists assuming that t
t in respect to your
host numbering and usage.
HTH
Christopher A. Kane, CCNP/CCDA
Router Ops Center/Hilliard NOC
UUNET/WCOM
-Original Message-
From: Daniel Wilson [mailto:[EMAIL PROTECTED]]
Sent: Friday, June 08, 2001 7:43 AM
To: [EMAIL PROTECTED]
Subject: Re: BGP for 2 T1's to one L
Hi!
You receive one full BGP table with about 90-1 prefixes from each of the
uplink ISPs... 2 ISP, 2 full BGP table...
128MB RAM is enough...
--
cU,
Laszlo Csosza
""Sergei G."" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Redundancy and loadbalancing are possible. The
1 /24 from each provider and round robin dns is not necessary if you get
both providers to route 1 /24. So ithe /24 belongs tp provider a, just
talk provider b into routing it. If you're doing bgp with them, this is a
perfectly reasonable request.
Brian "Sonic" Whalen
Success = Preparation + Op
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