From: alsontra@hotmail.com
Date: Mon Mar 01 2004 - 20:17:10 GMT-3
Kenneth,
The link proof devices I 've come in contact with use icmp, http, etc to
verify path connectivity. In addition, if you want bandwidth based load
balancing you have to use EIGRP,OSPF,BGP or static metrics on the device.
Also the device is incapable of affecting traffic in both direction. ISP
will use DNS info. I.E. DNS caches, DNS round robin, etc...
Perhaps I've made a snap judgment, but the fact that the device runs the
same routing protocols as a 2610 says to me its just an outbound load
balancer.
Correct me if I'm wrong, and please lets take this offline. I don't want to
pollute this forum. :-)
+$.02
Alsontra Daniels
----- Original Message -----
From: "Kenneth Wygand" <KWygand@customonline.com>
To: <alsontra@hotmail.com>; "Alex Hsieh" <ccie21@hotmail.com>; "CCIE R&S
Mailing list" <ccielab@groupstudy.com>
Sent: Monday, March 01, 2004 12:23 PM
Subject: RE: Wan link backup
> Alsontra,
>
> AFAIK, your statement is not correct. How can you load-balance (almost
> equal balance, as opposed to load share) if you have two ISP routers
> sitting behind a PIX firewall. Picture ISP router 1 having a single T1
> circuit and router 2 having two T1 circuits. Make sure to account for
> failover.
>
> If you come up with a solution other than linkproof, I'll be impressed.
> :)
>
> Kenneth E. Wygand
> Systems Engineer, Project Services
> CISSP #37102, CCNP, CCDP, ACSP, Cisco IPT Design Specialist, MCP, CNA,
> Network+, A+
> Custom Computer Specialists, Inc.
> "The only unattainable goal is the one not attempted."
> -Anonymous
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> alsontra@hotmail.com
> Sent: Monday, March 01, 2004 5:12 PM
> To: Alex Hsieh; CCIE R&S Mailing list
> Subject: Re: Wan link backup
>
> 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/
> > > > >
> > > > > ______________________________________________________________
> > > > > _________
> > > > > Please help support GroupStudy by purchasing your study
> > > > > materials from:
> > > > > http://shop.groupstudy.com
> > > > >
> > > > > Subscription information may be found at:
> > > > > http://www.groupstudy.com/list/CCIELab.html
> > > >
> > > >
> > > ______________________________________________________________
> > > _________
> > > > Please help support GroupStudy by purchasing your study
> > > materials from:
> > > > http://shop.groupstudy.com
> > > >
> > > > Subscription information may be found at:
> > > > http://www.groupstudy.com/list/CCIELab.html
> > >
> > > ______________________________________________________________
> > > _________
> > > Please help support GroupStudy by purchasing your study
> > > materials from:
> > > http://shop.groupstudy.com
> > >
> > > Subscription information may be found at:
> > > http://www.groupstudy.com/list/CCIELab.html
> >
> >
> _______________________________________________________________________
> > Please help support GroupStudy by purchasing your study materials
> from:
> > http://shop.groupstudy.com
> >
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
> _______________________________________________________________________
> Please help support GroupStudy by purchasing your study materials from:
> http://shop.groupstudy.com
>
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
> _______________________________________________________________________
> Please help support GroupStudy by purchasing your study materials from:
> http://shop.groupstudy.com
>
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Thu Apr 01 2004 - 08:15:11 GMT-3