GRE is used as a it provides pure tunneling see GRE for full information. To make secure the GRE tunneling we use GRE/IPSec or IPSec VPN tunnel, as it is one way of setting up private site-to-site connection by utilizing public network (the Internet). Since it is utilizing public network, there would be no need to have dedicated physical circuit to interconnect the sites, hence requiring low overhead to setup while maintain private and secure connection.
With site-to-site IPSec VPN, there is a IP routing in place to interconnect multiple subnet. This IP routing could be static routing or dynamic routing. In a small network where there is only one path connecting two sites, then static routing should be sufficient. When there are multiple paths connecting two sites, then dynamic routing (i.e. EIGRP, OSPF) should be used to have optimal connection just like i did for our office as we have multiple sites to connect and communicate so we used dynamic routing (EIGRP) although we use DMVPN (i will talk about it in next blogs).
Note that IPSec tunneling technology is only able to support static routes and basic IP interconnection. When there are more advance IP interconnections needed, such as running Novell IPX, dynamic routing, and load balancing between the sites, then IPSec tunneling itself is unable to support. For such advance IP interconnections, GRE tunneling is the choice. The downside of GRE tunneling is that GRE tunnel is less-secure tunnel compared to IPSec tunnel.
As we use dynamic routing and decided to use public network and also want to have a secure connection, so the workaround is to run GRE over IPSec. IPSec will then be encrypting the GRE tunnel securely and GRE tunnel will be providing the advance IP interconnection support. The Header will look like this (Rough sketch form me sorry for so simple :(
For the detail configuration of GRE and VPN look at my blogs.
I hope this will be informative for you.
Cheers :)
13 comments:
What's up Dear, are you genuinely visiting this site on a regular basis, if so afterward you will absolutely obtain good experience.
Here is my weblog - on line roulette for money
Thanks very interesting blog!
My website ... Work From Home Online Jobs
Good post. I learn something new and challenging on sites I stumbleupon
everyday. It's always helpful to read articles from other authors and practice a little something from their sites.
my blog post: online casino Going in bestusaonlinecasinos.tumblr.com
Greetings! Very useful advice within this post! It's the little changes that will make the largest changes. Thanks for sharing!
My web blog ... best place to find jobs online
I truly love your blog.. Pleasant colors & theme.
Did you make this web site yourself? Please reply back
as I'm attempting to create my own personal website and would love to learn where you got this from or what the theme is named. Thanks!
my weblog; get a part time job online
It's impressive that you are getting thoughts from this post as well as from our argument made at this time.
Visit my webpage - online data entry jobs free registration
My brother recommended I might like this website.
He was entirely right. This post truly made my day. You cann't imagine just how much time I had spent for this information! Thanks!
Feel free to surf to my web blog - forex options trading
Just wish to say your article is as surprising. The clarity in
your post is just great and i can assume you are an expert on this subject.
Well with your permission allow me to grab your feed to keep up to date with forthcoming post.
Thanks a million and please continue the rewarding work.
my blog ... online job boards
my website :: real online work from home jobs
Greetings from California! I'm bored at work so I decided to browse your site on my iphone during lunch break. I really like the info you present here and can't wait to take a look when I get home.
I'm surprised at how fast your blog loaded on my phone .. I'm not even
using WIFI, just 3G .. Anyways, wonderful site!
Also visit my blog post game affiliate programs
my page: binary options affiliate programs
I must thank you for the efforts you have put in writing this
blog. I'm hoping to check out the same high-grade content from you in the future as well. In truth, your creative writing abilities has inspired me to get my own blog now ;)
Feel free to surf to my site ... online jobs at home
Also see my web page > online jobs at home
I think the admin of this site is actually working hard in
support of his web page, since here every material is quality based material.
my webpage; finding an online job
michael kors, hermes, michael kors outlet, converse pas cher, vans pas cher, true religion jeans, michael kors, nike roshe, tn pas cher, michael kors outlet, michael kors outlet, michael kors outlet, north face, nike air max, mulberry, coach outlet, nike air max, ugg boots, nike free run uk, north face, replica handbags, nike air max, sac guess, michael kors outlet, lululemon, true religion jeans, abercrombie and fitch, nike blazer, hollister pas cher, michael kors, new balance pas cher, hogan, oakley pas cher, kate spade handbags, true religion outlet, coach outlet, air force, burberry outlet online, vanessa bruno, ugg boots, timberland, ray ban pas cher, true religion jeans, coach purses, lacoste pas cher, hollister, burberry, ralph lauren uk, ray ban uk, michael kors
bottes ugg, ugg boots uk, ugg,uggs,uggs canada, canada goose uk, canada goose outlet, pandora jewelry, moncler, hollister, marc jacobs, swarovski, juicy couture outlet, replica watches, canada goose, moncler, swarovski crystal, links of london, wedding dresses, moncler outlet, thomas sabo, karen millen, pandora jewelry, moncler, montre pas cher, juicy couture outlet, ugg pas cher, louis vuitton, moncler, moncler, louis vuitton, moncler, louis vuitton, supra shoes, coach outlet, canada goose, toms shoes, ugg,ugg australia,ugg italia, moncler, doudoune canada goose, canada goose, canada goose outlet, louis vuitton, pandora charms, canada goose, sac louis vuitton pas cher, pandora charms
Post a Comment