RE: HTTP request working via hostname but not via IP address

From: Hiten Pankhania (hiten.pankhania@vanquisbank.co.uk)
Date: Mon May 08 2006 - 11:01:16 EDT


Hi Arjun

Sorry I don't understand all of the problem..
I'm assuming you are trying to get to a website on iis?

Are there any firewalls involved in the Virtual addressing?
Are you using MS NLB on web servers to virtualises the address?

If so I know there are problems with this, firstly due to the way ISA
firewalls handle NLB and also checkpoints...due to this being a
multicast address.

There are also other thing you need to look at I bet the communication
on the switch is set to using unicast, when the NLB is invoked it uses
multicasting due to a virtual mac address being created..

Hopefully this should lead you into the right direction...

-----Original Message-----
From: Arjun Venkatraman [mailto:arjunishere@gmail.com]
Sent: 08 May 2006 10:56
To: javier@liendo.net
Cc: pen-test@securityfocus.com
Subject: Re: HTTP request working via hostname but not via IP address

Hey Javier,

The IP i'm trying to reach IS one of two IPs which correspond to a
virtual adress, but this is on an internal network, so the IP I am
aiming for is definitely not virtual.
Any other possibilities?

Cheers
Arjun

On 5/8/06, Javier Liendo <javier@liendo.net> wrote:
> hello arjun
>
> check if the website is a virtual website...most probably it is and
> that is the reason you can only get at it with the hostname and not
> the IP address...
>
> regards
>
> javier
>
> On 5/5/06, Arjun Venkatraman <arjunishere@gmail.com> wrote:
> > Hi all,
> >
> > I have a pretty basic sort of problem. While sending an HTTP
request
> > to a machine using a VBScript, when I mention the hostname in the
URL,
> > the request goes through smoothly. However, when I mention the IP
> > address explicitly, the request does not go through. I have
confirmed
> > he IP address multiple times to make sure the error is not a typo.
> >
> > If the machine name had not been accessible, I would have concluded
> > that the DNS query was the problem. But with the hostname working
and
> > the IP not working I am stumped.
> >
> > Any ideas?
> >
> > Cheers
> >
> > Arjun
> >
> >
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