From: Alex Hsieh (ccie21@hotmail.com)
Date: Mon Mar 01 2004 - 00:58:14 GMT-3
What if I setup one DNS server for each link,and register
DNS record with both of my DNS server address.Will it work?
Thanks.
regards
Alex
----- Original Message -----
From: "Church, Chuck" <cchurch@wamnetgov.com>
Cc: "CCIE R&S Mailing list" <ccielab@groupstudy.com>
Sent: Sunday, February 29, 2004 5:51 AM
Subject: RE: Wan link backup
> Whoops. Should have read it more carefully. BGP shouldn't be needed, but
you'll need some cooperation from the ISP. Since it's asymmetric DSL, it
looks like it may have been provisioned by their 'home' DSL group, vs. the
'business' DSL group. Getting the 'home' group to coordinate routing with
the leased circuit group may be tough. All depends on the ISP. I tried
doing a network like this with Verizon a few years ago. It was like pulling
teeth. Eventually gave up and did something else...
>
> Chuck Church
> Lead Design Engineer
> CCIE #8776, MCNE, MCSE
> Wam!Net Government Services
> 13665 Dulles Technology Dr. Ste 250
> Herndon, VA 20171
> Office: 703-480-2569
> Cell: 703-819-3495
> cchurch@wamnetgov.com
> PGP key:
http://pgp.mit.edu:11371/pks/lookup?op=index&search=cchurch%40wamnetgov.com
>
> > -----Original Message-----
> > From: Scott, Tyson C [mailto:tyson.scott@hp.com]
> > Sent: Saturday, February 28, 2004 1:15 PM
> > To: Jay Hennigan; Church, Chuck
> > Cc: Alex Hsieh; CCIE R&S Mailing list
> > Subject: RE: Wan link backup
> >
> >
> > Yes, your issue is with the ISP. You need to work with them
> > so they are
> > advertising your network back over the ADSL, however you want
> > them to do
> > it.
> >
> > Regards,
> >
> > Tyson Scott
> > Agilent Problem Management Team
> > Managed Network Services
> > Phone: 313-583-5812
> > Pager: 877-997-0811
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> > Behalf Of
> > Jay Hennigan
> > Sent: Saturday, February 28, 2004 12:38 AM
> > To: Church, Chuck
> > Cc: Alex Hsieh; CCIE R&S Mailing list
> > Subject: RE: Wan link backup
> >
> > On Fri, 27 Feb 2004, Church, Chuck wrote:
> >
> > > The inbound HTTP would be tough to fix without BGP. Mail is easy
> > > though. Create another MX record with a lower priority pointing to
> > > an address valid on the DSL link. On the other hand, you've got a
> > > router that can certainly handle BGP. Might be a better solution...
> >
> > I don't see where BGP would be needed here as both links are from the
> > same ISP. A dynamic routing protocol such as OSPF or even a simple
> > floating static of your routed addresses over the ADSL link over the
> > static on the DS-3 and a corresponding floating static default towards
> > the ADSL on your end should do the trick.
> >
> > Either of these requires the cooperation and some clue on the part of
> > your ISP, of course.
> >
> > We do this all the time for DSL backup of T-1 and greater.
> >
> > > > -----Original Message-----
> > > > From: Alex Hsieh [mailto:ccie21@hotmail.com]
> > > >
> > > > Our company currently uses 3725 router with 2 wan
> > links,one T3,
> > > >
> > > > the other is 1.5M ADSL.We use ADSL as backup connection.Both links
> > > >
> > > > belong to same ISP.The other day when T3 breaks,ADSL link come up.
> > > >
> > > > Outbound connection works,but outside can't establish inbound
> > > > connection
> > > >
> > > > to our server (mail,www).Is there anyway to enable inbound
> > > > server connection
> > > >
> > > > other than using BGP or other load-balancing device?Thanks.
> >
> > --
> > Jay Hennigan - CCIE #7880 - Network Administration - jay@west.net
> > WestNet: Connecting you to the planet. 805 884-6323 WB6RDV
> > NetLojix Communications, Inc. - http://www.netlojix.com/
> >
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