[Netalyzr] intranet proxy detection gets web server instead of proxy

Tue Dec 18 21:06:28 PST 2012

I believe you are sending this to the wrong person.

On Mon, Dec 17, 2012 at 8:22 AM, Alex Woick <alex at wombaz.de> wrote:

> Christian Kreibich schrieb am 12.12.2012 10:56:
> > We have the header information in the session transcript, so let us take
> > a look at what's going on. In the meantime it would be helpful if you
> > could tell us (e.g. via a tcpdump) what's the content we retrieve from
> > your webserver. I suppose it's a 404 of some sort?
> Yes, exactly. Apache acts as if the proxy request is a normal request to
> the local web server.
>
>    Frame: Number = 364, Captured Frame Length = 481, MediaType = ETHERNET
> + Ethernet: Etype = Internet IP
>
> (IPv4),DestinationAddress:[00-0C-29-F8-28-E0],SourceAddress:[BC-5F-F4-45-83-08]
> + Ipv4: Src = 10.10.10.14, Dest = 10.10.10.11, Next Protocol = TCP,
> Packet ID = 9106, Total IP Length = 467
> + Tcp: Flags=...AP..., SrcPort=52493, DstPort=HTTP(80), PayloadLen=427,
> Seq=2515443093 - 2515443520, Ack=2358625587, Win=256 (scale factor 0x8)
> = 65536
> - Http: Request, GET
>
> http://n2.netalyzr.icsi.berkeley.edu/conn/id=43ca208a-9025-9a9af3bb-31a2-47d2-82c5
>
>      Command: GET
>    - URI:
>
> http://n2.netalyzr.icsi.berkeley.edu/conn/id=43ca208a-9025-9a9af3bb-31a2-47d2-82c5
>       Location:
>
> http://n2.netalyzr.icsi.berkeley.edu/conn/id=43ca208a-9025-9a9af3bb-31a2-47d2-82c5
>
>      ProtocolVersion: HTTP/1.1
>      Host:  n2.netalyzr.icsi.berkeley.edu:80
>      UserAgent:  Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0)
> Gecko/20100101 Firefox/17.0
>      Accept:
> text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
>      Accept-Language:  de,en;q=0.5
>      Accept-Encoding:  gzip, deflate
>      Accept-Charset:  ISO-8859-1,utf-8;q=0.7,*;q=0.7
>      Connection:  close
>      HeaderEnd: CRLF
>
>    Frame: Number = 366, Captured Frame Length = 572, MediaType = ETHERNET
> + Ethernet: Etype = Internet IP
>
> (IPv4),DestinationAddress:[BC-5F-F4-45-83-08],SourceAddress:[00-0C-29-F8-28-E0]
> + Ipv4: Src = 10.10.10.11, Dest = 10.10.10.14, Next Protocol = TCP,
> Packet ID = 18040, Total IP Length = 558
> + Tcp: Flags=...AP..., SrcPort=HTTP(80), DstPort=52493, PayloadLen=518,
> Seq=2358625587 - 2358626105, Ack=2515443520, Win=245 (scale factor 0x6)
> = 15680
> - Http: Response, HTTP/1.1, Status: Not found, URL:
>
> http://n2.netalyzr.icsi.berkeley.edu/conn/id=43ca208a-9025-9a9af3bb-31a2-47d2-82c5
>
>      ProtocolVersion: HTTP/1.1
>      StatusCode: 404, Not found
>      Reason: Not Found
>      Date:  Mon, 17 Dec 2012 13:08:55 GMT
>      Server:  Apache/2.2.15 (CentOS)
>      ContentLength:  338
>      Connection:  close
>    + ContentType:  text/html; charset=iso-8859-1
>      HeaderEnd: CRLF
>    - payload: HttpContentType =  text/html; charset=iso-8859-1
>       HtmlElement: <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
>       HtmlElement:
> <html>
>       HtmlElement: <head>
>       HtmlElement:
> <title>
>       HtmlElement: 404 Not Found</title>
>       HtmlElement:
> </head>
>       HtmlElement: <body>
>       HtmlElement:
> <h1>
>       HtmlElement: Not Found</h1>
>       HtmlElement:
> <p>
>       HtmlElement: The requested URL
> /conn/id=43ca208a-9025-9a9af3bb-31a2-47d2-82c5 was not found on this
> server.</p>
>       HtmlElement:
> <hr>
>       HtmlElement:
> <address>
>       HtmlElement: Apache/2.2.15 (CentOS) Server at
> n2.netalyzr.icsi.berkeley.edu Port 80</address>
>       HtmlElement:
> </body>
>       HtmlElement: </html>
>       HtmlElement:
>
> I made a Microsoft Network monitor dump of one netalyzr session on my
> Windows machine (the one I run the netalyzr test from). As far as I
> know, the capture format is readable by many analyzer tools. I included
> frames from firefox.exe and java.exe. You can download it from here:
>
> http://www.wombaz.de/files-to-transfer/netalyzr.cap
>
> Tschau
> Alex
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>
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