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Port 80 and http

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swaminathan

Post subject: Port 80 and http

Posted: Tue Aug 02, 2011 2:30 am

New Member

Joined: Sun Jul 03, 2011 3:25 pm
Posts: 38

Hi

I studying on ports in tcp /ip section of CCNA.
I am just checking the opened ports in my adsl router .It is found that ports 80,443,25 etc are closed.

But how I am able to see the websites through http when port 80 is closed.

Thanks & Regards

S.Swaminathan

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Thanks & Regards

S.Swaminathan

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mellowd

Post subject: Re: Port 80 and http

Posted: Tue Aug 02, 2011 3:04 am

CCIE #38070

Joined: Wed Jun 18, 2008 7:49 am
Posts: 12425
Location: London, UK
Certs: CCIE ,CC-NP/IP, JNCIP-SP, JNCIS-ENT, BC-/SPNE/NP

They are closed inbound, not outbound

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www.mellowd.co.uk/ccie/

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swaminathan

Post subject: Re: Port 80 and http

Posted: Tue Aug 02, 2011 4:00 am

New Member

Joined: Sun Jul 03, 2011 3:25 pm
Posts: 38

mellowd wrote:

They are closed inbound, not outbound

I got cleared about the doubt .

Thanks for your prompt reply

S.Swaminathan

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Thanks & Regards

S.Swaminathan

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swaminathan

Post subject: Re: Port 80 and http

Posted: Thu Nov 17, 2011 4:51 am

New Member

Joined: Sun Jul 03, 2011 3:25 pm
Posts: 38

After few months
I have this doubt how data come to the router if port inbound is closed

May be wrong in my interpretation

Please clarify

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Thanks & Regards

S.Swaminathan

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Halo

Post subject: Re: Port 80 and http

Posted: Thu Nov 17, 2011 6:59 am

Post Whore

Joined: Thu Oct 14, 2010 4:39 am
Posts: 1003
Certs: CCNP (R&S, Security), ITILv3 Foundation

I WANT TO VIEW A WEBSITE.
I SEND MY REQUEST TO THE WEBSITE WITH A DESTINATION PORT OF 80, AND A SOURCE PORT OF 23875.
MY ROUTER ANTICIPATES THE RETURN TRAFFIC FROM THE WEBSITE WITH A DESTINATION PORT OF 23875.
THE WEBSITE SENDS TRAFFIC BACK TO ME WITH A DESTINATION PORT OF 23875, AND A SOURCE PORT OF 80.
MY ROUTER IS EXPECTING THIS TRAFFIC AND ALLOWS IT IN.
I CAN NOW READ THE WEBPAGE IN MY WEB BROWSER.
IT IS GOOD.

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swaminathan

Post subject: Re: Port 80 and http

Posted: Thu Nov 17, 2011 11:42 am

New Member

Joined: Sun Jul 03, 2011 3:25 pm
Posts: 38

Halo wrote:

Perfect explanation.Thanks a lot for your help !

_________________
Thanks & Regards

S.Swaminathan

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Davidr

Post subject: Re: Port 80 and http

Posted: Thu Nov 17, 2011 12:16 pm

Senior Member

Joined: Wed Aug 24, 2011 1:43 am
Posts: 485
Location: Bournemouth, UK
Certs: CCNP

Halo wrote:

LOL!!

sometimes i wish there was a "like" button or a rep button

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