From: alsontra@hotmail.com
Date: Mon Mar 01 2004 - 19:11:38 GMT-3
Linkproof = over priced linux box. It wouldn't solve your problem anyway.
These devices use the same protocol sets as your existing routers. Anything
that can be solved with a linkproof can be solved with a router.
02
Alsontra
----- Original Message -----
From: "Alex Hsieh" <ccie21@hotmail.com>
To: "CCIE R&S Mailing list" <ccielab@groupstudy.com>
Sent: Monday, March 01, 2004 7:20 AM
Subject: Re: Wan link backup
> hi Church:
>
> Thanks for your input.ISP is unable to help us.I've sorted to
>
> all resources still can't get this work.Maybe have to purchase linkproof
>
> or something like that.How about distributed director IOS feature?
>
> Will this work?Thanks.
>
> regards
> Alex
> ----- Original Message -----
> From: "Church, Chuck" <cchurch@wamnetgov.com>
> To: "Alex Hsieh" <ccie21@hotmail.com>; "CCIE R&S Mailing list"
> <ccielab@groupstudy.com>
> Sent: Monday, March 01, 2004 9:51 PM
> Subject: RE: Wan link backup
>
>
> I think what you're saying is having two different DNS servers valid, one
on
> each network block. These two are both registered with Network Solutions
> (or whatever they're calling themselves these days). One as a primary,
and
> one as a secondary. So if the DS3 goes down, the primary is now
unreachable
> and the secondary would become active, giving out addresses valid on the
> backup link, whereas the primary DNS was giving out addresses valid on the
> DS3 block. The problem would be caching of DNS records. You're TTL for
the
> nameservers would have to be extremely low for this to work, and probably
> not a good solution. I'm not sure if NetSol would even accept a TTL of
just
> minutes for an NS record. The incoming mail problem is easily solved with
> multiple MX records. For incoming HTTP, you might want to talk to a
hosting
> company that can redirect your WWW records to different hosts. No luck
with
> static routes from the ISP?
>
> 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: Alex Hsieh [mailto:ccie21@hotmail.com]
> > Sent: Sunday, February 29, 2004 10:58 PM
> > To: CCIE R&S Mailing list
> > Subject: Re: Wan link backup
> >
> >
> > 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%40
> > wamnetgov.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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