Re: this is a port scan, right?

From: Volker Birk (bumens_at_dingens.org)
Date: 08/03/05

  • Next message: neale: "Re: Spykids" 
    Date: 3 Aug 2005 08:39:58 +0200

    In comp.security.misc Wolfgang.Schelongowski@gmx.de wrote:
    > Volker Birk <bumens@dingens.org> writes:
    > >In comp.security.misc Wolfgang.Schelongowski@gmx.de wrote:
    > >> IIRC HTTP uses TCP/IP only, not UDP.
    > >vb@elk:~ $ grep ^http\ /etc/services
    > >http 80/udp www www-http # World Wide Web HTTP
    > >http 80/tcp www www-http # World Wide Web HTTP
    > >vb@elk:~ $
    > Quite a lot of services have reserved ports for both tcp and udp ...
    > >But most people do use TCP for HTTP.
    > [comp.infosystems.www.servers.misc re-added to solicit comments]
    > ... but Apache (at least in the standard config) doesn't listen to
    > incoming udp.

    Having a look to RFC 2616, I stand corrected:

    ----------------------------- snip -----------------------------------
    HTTP communication usually takes place over TCP/IP connections. The
    default port is TCP 80 [19], but other ports can be used. This does
    not preclude HTTP from being implemented on top of any other protocol
    on the Internet, or on other networks. HTTP only presumes a reliable
    transport; any protocol that provides such guarantees can be used;
    the mapping of the HTTP/1.1 request and response structures onto the
    transport data units of the protocol in question is outside the scope
    of this specification.
    ----------------------------- snap -----------------------------------

    "HTTP only presumes a reliable transport" - that is clear. UDP? No way.

    Hm... interesting, that in nearly every operating system the file
    services contains an entry for http/udp. Searching:

    http://www.google.de/search?q=http+udp+site%3Aw3.org

    we can read many discussions, wether it could be a good idea to use
    UDP also, especially in the HTTP/NG project. But those efforts didn't
    make it into the standard.

    Yours,
    VB. 

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