[isalist] Re: Interesting question...
- From: "Thomas W Shinder" <tshinder@xxxxxxxxxxx>
- To: <isalist@xxxxxxxxxxxxx>
- Date: Thu, 30 Mar 2006 20:51:03 -0600
http://www.ISAserver.org
-------------------------------------------------------
Steve,
The effect is the same in terms of source IP address. However, proxies
are going to "re-request" and so there's more than just address
replacement like there is with NAT (but you already knew that)
Thomas W Shinder, M.D.
Site: www.isaserver.org
Blog: http://blogs.isaserver.org/shinder/
Book: http://tinyurl.com/3xqb7
MVP -- ISA Firewalls
> -----Original Message-----
> From: isalist-bounce@xxxxxxxxxxxxx
> [mailto:isalist-bounce@xxxxxxxxxxxxx] On Behalf Of Steve Moffat
> Sent: Thursday, March 30, 2006 7:53 PM
> To: ISA Mailing List
> Subject: [isalist] Re: Interesting question...
>
> http://www.ISAserver.org
> -------------------------------------------------------
>
> Showing my ignorance again...:(..I always thought NAT supplied the
> external IP to hide your internals...oh well, one learns something new
> every day about tcp stuff.....
>
> S
> -----Original Message-----
> From: isalist-bounce@xxxxxxxxxxxxx
> [mailto:isalist-bounce@xxxxxxxxxxxxx]
> On Behalf Of Jim Harrison
> Sent: Thursday, March 30, 2006 9:51 PM
> To: ISA Mailing List
> Subject: [isalist] Re: Interesting question...
>
> http://www.ISAserver.org
> -------------------------------------------------------
>
> Nope - it's not.
> NAT doesn't break the TCP connection; proxy does.
>
> This is CERN proxy behavior; the upstream server is
> blissfully ignorant
> of the "real" client IP.
> It *may * have access to such niceties as user-agent, but
> those are not
> guaranteed.
>
> -------------------------------------------------------
> Jim Harrison
> MCP(NT4, W2K), A+, Network+, PCG
> http://isaserver.org/Jim_Harrison/
> http://isatools.org
> Read the help / books / articles!
> -------------------------------------------------------
>
>
> -----Original Message-----
> From: isalist-bounce@xxxxxxxxxxxxx
> [mailto:isalist-bounce@xxxxxxxxxxxxx]
> On Behalf Of Steve Moffat
> Sent: Thursday, March 30, 2006 17:31
> To: ISA Mailing List
> Subject: [isalist] Re: Interesting question...
>
> You are correct, It's doing NAT.
>
>
>
> S
>
>
>
> ________________________________
>
> From: isalist-bounce@xxxxxxxxxxxxx
> [mailto:isalist-bounce@xxxxxxxxxxxxx]
> On Behalf Of Ball, Dan
> Sent: Thursday, March 30, 2006 8:26 PM
> To: ISA Mailing List
> Subject: [isalist] Interesting question...
>
>
>
> I was trying to assist someone with logging traffic, and this is the
> explanation I got...
>
>
>
> ----------Quote----------
>
> Our network consists of a single Internet filter on the outisde
>
> (Screendoor) with several ISA 2000 and 2004 servers behind it. The
> client computer makes a request to a web site that will be blocked by
> screen door, it passes out the ISA server to Screendoor, Screendoor
> blocks it and the client ends up with a page could not be displayed
> message. Of course Screendoor in that example doesn't know
> what private
> ip address that request came from only the ISA server does, in my case
> the ISA 2004 server is configured in firewall/cache mode. Because of
> the problem we had been having with screendoor allowing the
> bad site to
> load if the user refreshed enough times we told screendoor to redirect
> the user to another site instead of just blocking them. The
> redirected
> site will be on our local web server. What I was asking is
> if we could
> embed a script of some sort on that local web site that would collect
> their private ip address as well as the local nds/ad username
> and store
> it in a log file. I'm trying to avoid requiring the users to login to
> the Internet separately from logging into the network and because the
> Internet filter is outside the firewall integrating it with
> nds/ad isn't
> really an option either. We're ultimately moving to a Dansguardian
> solution anyway and possibly several of them (inside each firewall and
> one possibly outside the firwall where Screendoor currently
> sits) so it
> will become a mute point eventually anyway.
>
> ----------End Quote----------
>
>
>
> Am I correct to assume that all traffic coming out of the ISA server
> would be stripped of all identifying information, and the
> server it was
> redirected to would only show the IP of the screendoor/ISA server?
>
>
>
>
>
>
> All mail to and from this domain is GFI-scanned.
>
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