Discussion on:

Cisco administration 101: Configure GRE tunnels

Very nice article. Keep up the good work.

I've been using this method for years in order to tunnel IPX traffic over the Internet, something my Cisco vendor originally tried to tell me couldn't be done. By establishing GRE tunnels, and then encrypting them with IPSec, I can have all of my remote Novell 4.x servers securely communicating over the Internet using their native IPX protocol. This functionality allowed us to get rid of our expensive point-to-point WAN links and implement a much more cost effective Internet VPN-based WAN.

As for why we're still running Novell 4.x servers all over the place, that is a topic for another post...

Hi!...anybody here knows if I can use a GRE tunnel from one CE to another between 2 different AS to run Multicast (MVPN)???

This article is wonderful, Now i know what is GRE tunnel, how it work and how to configure it on router.
Thanks David, Keep writing such articles.
Regards
Adesh

Hi,
I de like de know how to configure a gre tunnel on a router and tow radundante routers using HSRP.

thanks

Very informative.possible to have full examples of configuring ipsec tunnels

Hey, quick question. Are there any caveats about using the HSRP VIP's (Virtual IP's) on the source and destination addresses on the GRE Tunnel interfaces?