[c-nsp] Load balancing across 2 ADSL lines

James O'Farrell James.O'Farrell at valuelink.co.uk
Thu Oct 13 10:57:08 EDT 2005


David,

Thanks for that GLBP appears to be exactly what I am looking for. If the
current gateway terminates VPN I assume GLBP will just balance between
the 2 gateways irrelevant of the final destination and it is up to the
gateway to deal with the VPN traffic.

Regards
James O'Farrell

-----Original Message-----
From: David Coulson [mailto:david at davidcoulson.net] 
Sent: 13 October 2005 15:01
To: James O'Farrell
Cc: Kristofer Sigurdsson; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Load balancing across 2 ADSL lines

James O'Farrell wrote:

> In regards to HSRP I have seen this;
>
http://www.cisco.com/en/US/tech/tk648/tk362/technologies_configuration_e
xample09186a0080094e90.shtml 
> which used 2 x instances of HSRP to load balance.

That seems like an ugly hack. GLBP does a better task, assuming you have
many hosts behind the routers.

> Unfortunately I am getting 2 ADSL lines from 2 Different ISP's so
multilink and any routing trickery is out.

I handle this myself (Using DSL + Cable), by running outbound GRE
tunnels over IPSec, which I can then route traffic using either load
balancing, or OSPF.

David




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