Re: Freebsd bad routing

From: Greg Barniskis (nalists_at_scls.lib.wi.us)
Date: 07/15/05

  • Next message: Helge Preuss: "Re: better disk reliability on a desktop machine" 
    Date: Fri, 15 Jul 2005 09:29:42 -0500
To: Joseh Martins <joseh.martins@gmail.com>

    Joseh Martins wrote:
    > Hello,
    >
    > I have a Freebsd server and some bad routes are been showed to me.
    >
    > Well, I didnt configured any routing protocols ...
    >
    > With the command "netstat -r" I got a lot of routes with "UGHD" flags.
    > I just need the default route (gateway).
    >
    > With the command "netstat -rs" I got this message:
    > "127 bad routing redirects
    > 1091 dynamically created routes"
    >
    > I appreciate some help.
    > Tks a lot..

    UGHD would seem to indicate that your box has been told (by ICMP
    redirects) not to use your configured default gateway to reach a
    specific host, but to use a different gateway instead. It is not
    necessarily a bad thing.

    My guess: either (a) there are two or more available gateways
    upstream from you and they are legitimately collaborating to inform
    you of the best (possibly only) routes to use to get to various
    destinations, or (b) you are getting bad ICMP redirects from
    somewhere, either accidental or intentional.

    If you know that one or more of the indicated UGHD routes is just
    plain wrong, that would be bad (maybe a spoofing or DoS attack of
    some kind). If you are unsure whether the routes are valid or not,
    contact the route provider upstream from you for clarification of
    whether this is legitimate (and whether you have specified the
    correct default gateway in the first place). 

    -- 
Greg Barniskis, Computer Systems Integrator
South Central Library System (SCLS)
Library Interchange Network (LINK)
<gregb at scls.lib.wi.us>, (608) 266-6348
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