Saturday, March 24, 2007

Transparent Layer 2 Firewall

Ok, i got to blog this. Personally i had not configure a Layer 2 transparent firewall in a Cisco Router but this seems interesting, useful and powerful feature to me. I never knew that modern cisco routers have Layer 2 firewall capabilities until this very moment. This transparent firewall somehow works similarly to Layer 3 firewall except that it is totally transparent and requires bridging to be configured. Both Integrated Routing Bridging (IRB) and Bridge Virtual Interface (BVI) needs to be configured in order for it to work.

" A transparent Cisco IOS firewall acts as a Layer 2 transparent bridge with context-based access control (CBAC) and ACLs configured on the bridged interface."

So, transparent firewalling works in accordination with CBAC too which provides even more stringent security measures against interfaces. So on the same router, i can have both Layer 2 and Layer 3 firewall running at the same time with IRB providing Layer 2 bridging on interfaces and BVI providing Layer 3 routing of packets. A detailed step to step configuration and explaination can be found here:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123newft/123t/123t_7/gt_trans.htm

I am looking forward to configure a Layer 2 transparent firewall one of these days :)

28 comments:

Anonymous said...

I truly believe that we have reached the point where technology has become one with our world, and I am fairly certain that we have passed the point of no return in our relationship with technology.


I don't mean this in a bad way, of course! Societal concerns aside... I just hope that as the price of memory drops, the possibility of uploading our memories onto a digital medium becomes a true reality. It's one of the things I really wish I could see in my lifetime.


(Posted on Nintendo DS running [url=http://quizilla.teennick.com/stories/16129580/does-the-r4-or-r4i-work-with-the-new-ds]R4i SDHC[/url] DS HomeBrow)

Anonymous said...

Genial brief and this enter helped me alot in my college assignement. Say thank you you seeking your information.

Anonymous said...

The holidays are a time ed hardy of getting together with friends ed hardy shoes and family, attending elaborate ed hardy clothing parties, and other exciting events ed hardy clothes that involves dressing up in stunning ed hardy store wardrobes. If you ed hardy Bikini are pregnant during ed hardy swimsuits the holidays, it does not ed hardy Caps mean that you are unable buy ed hardy to look fabulous and ed hardy swimwear stylish. Now, an expectant ed hardy sale mother has many styles of chic ed hardy glasses maternity clothing that allows cheap ed hardy her to show off her baby bump Christian audigier while looking spectacular.

Anonymous said...

The war was cruel and people were forced to leave their native places. There was no doubt that they lost touch with each other. Many soldiers were killed but he tried his best to keep alive because he owed her a wedding and he promised to come back.[url=http://www.sunglassescool.com/porsche-design-sunglasses.html]Prescription Porsche Design Sunglasses[/url]
Rolex watches are amazing. A gorgeous Rolex watch looks great and stylish. As we all know that Rolex watches are known for its strength and endurance, that's why Rolex watches have a good reputation for so many years. And also you will see the quality and precision reflected in each Rolex watch. So, Rolex is a name that thousands of people had dreamed of.

Anonymous said...

PmwXuq [url=http://www.bootsshowjp.com/]UGG アグ ブーツ [/url] UjmHpa http://www.bootsshowjp.com/ YgcPmi [url=http://www.mutonbu-tsu.com/]UGG アグ[/url] XrdEnj http://www.mutonbu-tsu.com/ LyvTye [url=http://www.australiabestboots.com/]ugg メンズ[/url] SnmQjb http://www.australiabestboots.com/ MvkCrl[url=http://www.bestbootsjapan.com/]アグ[/url] OqhLwm http://www.bestbootsjapan.com/ MxsIxl [url=http://www.bootshotsales.com/]アグ ブーツ[/url] UdyZuj http://www.bootshotsales.com/ UsoTig [url=http://www.bootssaletojp.com/]australia ugg[/url] EfwPey http://www.bootssaletojp.com/ OkvBpq

Anonymous said...

XuePfc [url=http://www.bootsshowjp.com/]UGG [/url] VitWqs http://www.bootsshowjp.com/ OkiVax [url=http://www.mutonbu-tsu.com/]UGG ムートン[/url] PefLed http://www.mutonbu-tsu.com/ RnzYrt [url=http://www.australiabestboots.com/]ugg ブーツ[/url] OmzJtm http://www.australiabestboots.com/ QvgMaw[url=http://www.bestbootsjapan.com/]ugg メンズ[/url] DnhJiz http://www.bestbootsjapan.com/ OpbPpq [url=http://www.bootshotsales.com/]ugg ブーツ[/url] TvfVqx http://www.bootshotsales.com/ KbsSzi [url=http://www.bootssaletojp.com/]ugg ブーツ[/url] AxwUne http://www.bootssaletojp.com/ CoeWma

Anonymous said...

XvyBjp [url=http://www.bu-tsujapan.com/]アグ[/url] VvnMvw http://www.bu-tsujapan.com/ NrpHxl [url=http://www.bu-tsujp.com/]ugg[/url] UxnDgr http://www.bu-tsujp.com/ CavRtu [url=http://www.newbootstojp.com/]ugg ムートンブーツ[/url] AxfHgy http://www.newbootstojp.com/ MadSbd [url=http://www.kutsujp.com/]ムートンブーツugg[/url] RlsCkh http://www.kutsujp.com/ UxrKaf [url=http://www.bootsladiesnew.com/]UGG トールブーツ[/url] FgcNyc http://www.bootsladiesnew.com/ NnoGyb [url=http://www.bu-tsugekiyasu.com/]ugg[/url] HogAgz http://www.bu-tsugekiyasu.com/ AuiUss

Anonymous said...

dnoxk [url=http://cheapdrebeatssale.co.uk]monster beats[/url] oduvtz http://cheapdrebeatssale.co.uk batmzmjkr [url=http://drdrebeatsuksales.co.uk]cheap beats uk[/url] smaqdc http://drdrebeatsuksales.co.uk pmrdvwedc [url=http://cheapestbeatsheadphones.co.uk]dr dre beats uk[/url] blqtrn http://cheapestbeatsheadphones.co.uk xxtkcuyzptvseoa rl [url=http://beatsbydreukforsales.co.uk]beats by dre cheap[/url] cemitr rb beatsbydreukforsales.co.uk yfgxt wofbwsu [url=http://cheapdrebeatsuksale.co.uk]cheap beats uk[/url] ovgfwe http://cheapdrebeatsuksale.co.uk njtxuhfqt [url=http://beatsbydrebestbuy.co.uk]beats by dr dre[/url] jfcccb http://beatsbydrebestbuy.co.uk befvbpvyms [url=http://beatsbydrdreukoutlet.co.uk]cheap beats[/url] vauqqh http://beatsbydrdreukoutlet.co.uk hvxnaaiyc [url=http://cheapestdrebeats.co.uk]beats by dre[/url] cmbeik http://cheapestdrebeats.co.uk mxgtmhezd [url=http://drdrebeatsoutlet.co.uk]monster beats[/url] eyceab http://drdrebeatsoutlet.co.uk etbmc

Anonymous said...

wtz [url=http://www.celineluggagetotediscount.com]Celine Bags[/url] sqc http://www.celineluggagetotediscount.com rej [url=http://www.celinehandbagsdiscount.com]Celine Handbags[/url] tke http://www.celinehandbagsdiscount.com zrf [url=http://www.celinebagxiao.com]Celine Handbags[/url] msy http://www.celinebagxiao.com slc [url=http://www.celinehandbagswe.com]Celine Handbags[/url] soy http://www.celinehandbagswe.com syi [url=http://www.drdrebeatsname.com]Dr Dre Beats[/url] cym http://www.drdrebeatsname.com kjh

Anonymous said...

With having so much content do you ever run into any problems of
plagiarism or copyright violation? My blog has a lot of exclusive content I've either authored myself or outsourced but it appears a lot of it is popping it up all over the web without my agreement. Do you know any methods to help reduce content from being ripped off? I'd certainly appreciate it.



My page - Golf Putting
My webpage: Golf Shot Tips : How to Golf Putt

Anonymous said...

Hey!
I know this is kinda off topic but I was wondering which blog platform are you using for
this website? I'm getting tired of Wordpress because I've had issues with
hackers and I'm looking at alternatives for another platform. I would be awesome if you could point me in the direction of a good platform.

My page ... how to golf

Anonymous said...

Very good site!

Also visit my site: Toenail Fungus
Also see my site > get rid of nail fungus how to get rid of toenail fungus

Anonymous said...

Thanks for your excellent posting.
I really enjoyed reading it, you will be a great writer.
Keep up with the great job, have a nice evening.


my web-site Gas Mileage

Anonymous said...

Wow! I'm really enjoying the design of your weblog. Are you using a custom template or is this readily available to all users? If you really don't want
to say the name of it out in the general public, please email me.
I'd really like to get my hands on this theme! Many thanks.

my web page :: Shooting Games

Anonymous said...

Hi there,
Are you on Twitter? I'd like to follow you but couldn't find the link!


Feel free to surf to my blog - Best iPhone App

Anonymous said...

Hello there,
I'm wondering if you might be interested in doing a link exchange? I notice your blog: http://www.blogger.com/comment.g?blogID=2673681754036568683&postID=4880595992599164333 and my website are primarily based around the same subject. I'd love to switch links or possibly guest author a article
for you. Thanks for your time.

Feel free to surf to my blog post: How to Golf App

Anonymous said...

I'm not that much of a internet reader to be honest but your blog is great, thanks!

Feel free to surf to my blog post; iphone mileage

Anonymous said...

Thoroughly helpful post on Blogger: Taking Network
Security to the Streets...
Keep publishing..

my web page :: Golf App

Anonymous said...

Hello.
It looks as though we both have a interest for the same thing.

Your blog, "Blogger: Taking Network Security to the Streets" and mine are very similar.
Have you ever thought about writing a guest
article for a similar blog? It will definitely help gain publicity to your blog (my site
receives a lot of targeted traffic). If you are interested, email me.
Thank you so much

Also visit my homepage Beginners Golf Putting
my page :: Beginners Golf Putting

Anonymous said...

yyuow [url=http://www.celinehandbagsname.com]celine bag[/url] iuboq http://www.celinehandbagsname.com uwdn [url=http://www.celinebagsname.com]celine handbags[/url] kjbpl http://www.celinebagsname.com qwny [url=http://www.celinebagname.com]celine bag[/url] agvny http://www.celinebagname.com vrooe [url=http://www.celinebagswe.com]celine bag[/url] xtswh http://www.celinebagswe.com kttiy [url=http://www.celinebagwe.com]celine bags sale[/url] rkgfw http://www.celinebagwe.com jtrej [url=http://www.celinebagnamey.com]celine bags[/url] qdswd http://www.celinebagnamey.com mkqw [url=http://www.celineluggagetotename.com]celine bag[/url] aenie http://www.celineluggagetotename.com lure

Anonymous said...

nmvrdk http://pa-louisvuittoncheap.com ldsjec http://www.mccanadagooseoutlet.com aupeqc http://www.sale-cheapmontblanc.com eubapg http://cheaperbeatssbydre.com vgktqs http://palouisvuittonoutlet.com qkahkx [url=http://pa-louisvuittoncheap.com]louis vuitton sale[/url] gqnfr [url=http://www.mccanadagooseoutlet.com]canada goose jacket[/url] cqshj [url=http://www.sale-cheapmontblanc.com]mont blanc[/url] vtfma [url=http://cheaperbeatssbydre.com]dr dre beats[/url] alabvx [url=http://palouisvuittonoutlet.com]louis vuitton bags[/url] rlxx

Anonymous said...

QypKmv [url=http://louisvuittonoutlet-lo.com]louis vuitton outlet[/url] eGlA http://louisvuittonoutlet-lo.com MlfMbx [url=http://mplouisvuittonoutlet.com]louis vuitton outlet[/url] aDkE http://mplouisvuittonoutlet.com XqgKlm [url=http://celinebagsincheap.com]celine bag[/url] cJwM http://celinebagsincheap.com QnuSmx [url=http://mocelinebag.com]celine bag[/url] sCjL http://mocelinebag.com KhjNrh [url=http://mocelinebagsale.com]celine bag[/url] mMoV http://mocelinebagsale.com ZmlXtu [url=http://mocelinehandbag.com]celine bag[/url] mIeC http://mocelinehandbag.com nReL

Anonymous said...

ZfnLwh [url=http://beatsbydremu.com]beats by dre studio[/url] gTpD http://beatsbydremu.com EqoUyc [url=http://drebeatsmu.com]dr dre beats[/url] zJbC http://drebeatsmu.com TebBbs [url=http://beatsbydrdremu.com]beats by dre cheap[/url] rGgN http://beatsbydrdremu.com QspZle [url=http://custombeatsbydremu.com]custom beats by dre[/url] mBoX http://custombeatsbydremu.com SpkObn [url=http://monsterbeatsmu.com]monster beats by dre[/url] yAoQ http://monsterbeatsmu.com VwnRtv [url=http://monsterbeatspromu.com]monster beats headphones[/url] eHcA http://monsterbeatspromu.com wTaD

Anonymous said...

DgpUuc [url=http://dis-louisvuittonoutlet.com]dis-louisvuittonoutlet[/url] eEaE http://dis-louisvuittonoutlet.com RhuDcj [url=http://mvplouisvuittonoutlet.com]louis vuitton sale[/url] nGsV http://mvplouisvuittonoutlet.com jJiM

Anonymous said...

UknYpr [url=http://nblouisvuittonoutlet.com]louis vuitton sale[/url] nBlX http://nblouisvuittonoutlet.com JwfIpb [url=http://nblouisvuittonsale.com]louis vuitton sale[/url] oSsE http://nblouisvuittonsale.com eTfO

Anonymous said...

CizFix [url=http://beatsbydregun.com]beats by dre[/url] yJnJ http://beatsbydregun.com OsuRol [url=http://drdrebeatsgun.com]dr dre beats[/url] aDdH http://drdrebeatsgun.com PmdAqm [url=http://drebeatsgun.com]dre beats headphones[/url] lArP http://drebeatsgun.com NtzAdt [url=http://beatsbydrdregun.com]beats by dre cheap[/url] jUoW http://beatsbydrdregun.com UyfJgs [url=http://cheapbeatsbydregun.com]beats by dre studio[/url] kLdQ http://cheapbeatsbydregun.com UvjOpx [url=http://customizebeatsbydregun.com]customizebeatsbydregun[/url] vZhM http://customizebeatsbydregun.com aAhP

Anonymous said...

zttqnn http://www.capemaycitypolice.com/MonstBeatsByDre.html ndvalm http://www.capemaycitypolice.com/cheapnikeairmaxb.html cbdogp http://www.chancemccann.com/cheap-airjordans.html eqhcez http://www.oceancityseafood.com/celinehandbags.html nfvmog http://maryhelverson.com/celinehandbagsb.html mbhnxl [url=http://www.capemaycitypolice.com/MonstBeatsByDre.html]dr dre beats[/url] djiay [url=http://www.capemaycitypolice.com/cheapnikeairmaxb.html]nike air max[/url] cmcyh [url=http://www.chancemccann.com/cheap-airjordans.html]air jordan[/url] ywlbn [url=http://www.oceancityseafood.com/celinehandbags.html]celine handbags[/url] fiyhzn [url=http://maryhelverson.com/celinehandbagsb.html]celine bags[/url] ugrv

Anonymous said...

iimise http://www.capemaycitypolice.com/MonstBeatsByDre.html mgdxrc http://www.capemaycitypolice.com/cheapnikeairmaxb.html kjfjxb http://www.chancemccann.com/cheap-airjordans.html xoaogh http://www.oceancityseafood.com/celinehandbags.html uwxoiw http://maryhelverson.com/celinehandbagsb.html zuqkoc [url=http://www.capemaycitypolice.com/MonstBeatsByDre.html]beats by dre[/url] ntpqq [url=http://www.capemaycitypolice.com/cheapnikeairmaxb.html]air max shoes[/url] mclzw [url=http://www.chancemccann.com/cheap-airjordans.html]air jordan[/url] ygehl [url=http://www.oceancityseafood.com/celinehandbags.html]celine bag[/url] pylpre [url=http://maryhelverson.com/celinehandbagsb.html]celine bag[/url] stki